naga/front/wgsl/
error.rs

1//! Formatting WGSL front end error messages.
2
3use crate::common::wgsl::TryToWgsl;
4use crate::diagnostic_filter::ConflictingDiagnosticRuleError;
5use crate::error::replace_control_chars;
6use crate::proc::{Alignment, ConstantEvaluatorError, ResolveError};
7use crate::{Scalar, SourceLocation, Span};
8
9use super::parse::directive::enable_extension::{EnableExtension, UnimplementedEnableExtension};
10use super::parse::directive::language_extension::{
11    LanguageExtension, UnimplementedLanguageExtension,
12};
13use super::parse::lexer::Token;
14
15use codespan_reporting::diagnostic::{Diagnostic, Label};
16use codespan_reporting::files::SimpleFile;
17use codespan_reporting::term;
18use thiserror::Error;
19
20use alloc::{
21    borrow::Cow,
22    boxed::Box,
23    format,
24    string::{String, ToString},
25    vec,
26    vec::Vec,
27};
28use core::ops::Range;
29
30#[derive(Clone, Debug)]
31pub struct ParseError {
32    message: String,
33    // The first span should be the primary span, and the other ones should be complementary.
34    labels: Vec<(Span, Cow<'static, str>)>,
35    notes: Vec<String>,
36}
37
38impl ParseError {
39    pub fn labels(&self) -> impl ExactSizeIterator<Item = (Span, &str)> + '_ {
40        self.labels
41            .iter()
42            .map(|&(span, ref msg)| (span, msg.as_ref()))
43    }
44
45    pub fn message(&self) -> &str {
46        &self.message
47    }
48
49    fn diagnostic(&self) -> Diagnostic<()> {
50        let diagnostic = Diagnostic::error()
51            .with_message(self.message.to_string())
52            .with_labels(
53                self.labels
54                    .iter()
55                    .filter_map(|label| label.0.to_range().map(|range| (label, range)))
56                    .map(|(label, range)| {
57                        Label::primary((), range).with_message(label.1.to_string())
58                    })
59                    .collect(),
60            )
61            .with_notes(
62                self.notes
63                    .iter()
64                    .map(|note| format!("note: {note}"))
65                    .collect(),
66            );
67        diagnostic
68    }
69
70    /// Emits a summary of the error to standard error stream.
71    #[cfg(feature = "stderr")]
72    pub fn emit_to_stderr(&self, source: &str) {
73        self.emit_to_stderr_with_path(source, "wgsl")
74    }
75
76    /// Emits a summary of the error to standard error stream.
77    #[cfg(feature = "stderr")]
78    pub fn emit_to_stderr_with_path<P>(&self, source: &str, path: P)
79    where
80        P: AsRef<std::path::Path>,
81    {
82        let path = path.as_ref().display().to_string();
83        let files = SimpleFile::new(path, replace_control_chars(source));
84        let config = term::Config::default();
85
86        cfg_if::cfg_if! {
87            if #[cfg(feature = "termcolor")] {
88                let writer = term::termcolor::StandardStream::stderr(term::termcolor::ColorChoice::Auto);
89            } else {
90                let writer = std::io::stderr();
91            }
92        }
93
94        term::emit(&mut writer.lock(), &config, &files, &self.diagnostic())
95            .expect("cannot write error");
96    }
97
98    /// Emits a summary of the error to a string.
99    pub fn emit_to_string(&self, source: &str) -> String {
100        self.emit_to_string_with_path(source, "wgsl")
101    }
102
103    /// Emits a summary of the error to a string.
104    pub fn emit_to_string_with_path<P>(&self, source: &str, path: P) -> String
105    where
106        P: AsRef<std::path::Path>,
107    {
108        let path = path.as_ref().display().to_string();
109        let files = SimpleFile::new(path, replace_control_chars(source));
110        let config = term::Config::default();
111
112        let mut writer = crate::error::DiagnosticBuffer::new();
113        term::emit(writer.inner_mut(), &config, &files, &self.diagnostic())
114            .expect("cannot write error");
115        writer.into_string()
116    }
117
118    /// Returns a [`SourceLocation`] for the first label in the error message.
119    pub fn location(&self, source: &str) -> Option<SourceLocation> {
120        self.labels.first().map(|label| label.0.location(source))
121    }
122}
123
124impl core::fmt::Display for ParseError {
125    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
126        write!(f, "{}", self.message)
127    }
128}
129
130impl core::error::Error for ParseError {}
131
132#[derive(Copy, Clone, Debug, PartialEq)]
133pub enum ExpectedToken<'a> {
134    Token(Token<'a>),
135    Identifier,
136    AfterIdentListComma,
137    AfterIdentListArg,
138    /// Expected: constant, parenthesized expression, identifier
139    PrimaryExpression,
140    /// Expected: assignment, increment/decrement expression
141    Assignment,
142    /// Expected: 'case', 'default', '}'
143    SwitchItem,
144    /// Expected: ',', ')'
145    WorkgroupSizeSeparator,
146    /// Expected: 'struct', 'let', 'var', 'type', ';', 'fn', eof
147    GlobalItem,
148    /// Expected a type.
149    Type,
150    /// Access of `var`, `let`, `const`.
151    Variable,
152    /// Access of a function
153    Function,
154    /// The `diagnostic` identifier of the `@diagnostic(…)` attribute.
155    DiagnosticAttribute,
156}
157
158#[derive(Clone, Copy, Debug, Error, PartialEq)]
159pub enum NumberError {
160    #[error("invalid numeric literal format")]
161    Invalid,
162    #[error("numeric literal not representable by target type")]
163    NotRepresentable,
164}
165
166#[derive(Copy, Clone, Debug, PartialEq)]
167pub enum InvalidAssignmentType {
168    Other,
169    Swizzle,
170    ImmutableBinding(Span),
171}
172
173#[derive(Clone, Debug)]
174pub(crate) enum Error<'a> {
175    Unexpected(Span, ExpectedToken<'a>),
176    UnexpectedComponents(Span),
177    UnexpectedOperationInConstContext(Span),
178    BadNumber(Span, NumberError),
179    BadMatrixScalarKind(Span, Scalar),
180    BadAccessor(Span),
181    BadTexture(Span),
182    BadTypeCast {
183        span: Span,
184        from_type: String,
185        to_type: String,
186    },
187    NotStorageTexture(Span),
188    BadTextureSampleType {
189        span: Span,
190        scalar: Scalar,
191    },
192    BadIncrDecrReferenceType(Span),
193    InvalidResolve(ResolveError),
194    InvalidForInitializer(Span),
195    /// A break if appeared outside of a continuing block
196    InvalidBreakIf(Span),
197    InvalidGatherComponent(Span),
198    InvalidConstructorComponentType(Span, i32),
199    InvalidIdentifierUnderscore(Span),
200    ReservedIdentifierPrefix(Span),
201    UnknownAddressSpace(Span),
202    InvalidLocalVariableAddressSpace(Span),
203    RepeatedAttribute(Span),
204    UnknownAttribute(Span),
205    UnknownBuiltin(Span),
206    UnknownAccess(Span),
207    UnknownIdent(Span, &'a str),
208    UnknownScalarType(Span),
209    UnknownType(Span),
210    UnknownStorageFormat(Span),
211    UnknownConservativeDepth(Span),
212    UnknownEnableExtension(Span, &'a str),
213    UnknownLanguageExtension(Span, &'a str),
214    UnknownDiagnosticRuleName(Span),
215    SizeAttributeTooLow(Span, u32),
216    AlignAttributeTooLow(Span, Alignment),
217    NonPowerOfTwoAlignAttribute(Span),
218    InconsistentBinding(Span),
219    TypeNotConstructible(Span),
220    TypeNotInferable(Span),
221    InitializationTypeMismatch {
222        name: Span,
223        expected: String,
224        got: String,
225    },
226    DeclMissingTypeAndInit(Span),
227    MissingAttribute(&'static str, Span),
228    InvalidAddrOfOperand(Span),
229    InvalidAtomicPointer(Span),
230    InvalidAtomicOperandType(Span),
231    InvalidRayQueryPointer(Span),
232    NotPointer(Span),
233    NotReference(&'static str, Span),
234    InvalidAssignment {
235        span: Span,
236        ty: InvalidAssignmentType,
237    },
238    ReservedKeyword(Span),
239    /// Redefinition of an identifier (used for both module-scope and local redefinitions).
240    Redefinition {
241        /// Span of the identifier in the previous definition.
242        previous: Span,
243
244        /// Span of the identifier in the new definition.
245        current: Span,
246    },
247    /// A declaration refers to itself directly.
248    RecursiveDeclaration {
249        /// The location of the name of the declaration.
250        ident: Span,
251
252        /// The point at which it is used.
253        usage: Span,
254    },
255    /// A declaration refers to itself indirectly, through one or more other
256    /// definitions.
257    CyclicDeclaration {
258        /// The location of the name of some declaration in the cycle.
259        ident: Span,
260
261        /// The edges of the cycle of references.
262        ///
263        /// Each `(decl, reference)` pair indicates that the declaration whose
264        /// name is `decl` has an identifier at `reference` whose definition is
265        /// the next declaration in the cycle. The last pair's `reference` is
266        /// the same identifier as `ident`, above.
267        path: Box<[(Span, Span)]>,
268    },
269    InvalidSwitchSelector {
270        span: Span,
271    },
272    InvalidSwitchCase {
273        span: Span,
274    },
275    SwitchCaseTypeMismatch {
276        span: Span,
277    },
278    CalledEntryPoint(Span),
279    WrongArgumentCount {
280        span: Span,
281        expected: Range<u32>,
282        found: u32,
283    },
284    /// No overload of this function accepts this many arguments.
285    TooManyArguments {
286        /// The name of the function being called.
287        function: String,
288
289        /// The function name in the call expression.
290        call_span: Span,
291
292        /// The first argument that is unacceptable.
293        arg_span: Span,
294
295        /// Maximum number of arguments accepted by any overload of
296        /// this function.
297        max_arguments: u32,
298    },
299    /// A value passed to a builtin function has a type that is not
300    /// accepted by any overload of the function.
301    WrongArgumentType {
302        /// The name of the function being called.
303        function: String,
304
305        /// The function name in the call expression.
306        call_span: Span,
307
308        /// The first argument whose type is unacceptable.
309        arg_span: Span,
310
311        /// The index of the first argument whose type is unacceptable.
312        arg_index: u32,
313
314        /// That argument's actual type.
315        arg_ty: String,
316
317        /// The set of argument types that would have been accepted for
318        /// this argument, given the prior arguments.
319        allowed: Vec<String>,
320    },
321    /// A value passed to a builtin function has a type that is not
322    /// accepted, given the earlier arguments' types.
323    InconsistentArgumentType {
324        /// The name of the function being called.
325        function: String,
326
327        /// The function name in the call expression.
328        call_span: Span,
329
330        /// The first unacceptable argument.
331        arg_span: Span,
332
333        /// The index of the first unacceptable argument.
334        arg_index: u32,
335
336        /// The actual type of the first unacceptable argument.
337        arg_ty: String,
338
339        /// The prior argument whose type made the `arg_span` argument
340        /// unacceptable.
341        inconsistent_span: Span,
342
343        /// The index of the `inconsistent_span` argument.
344        inconsistent_index: u32,
345
346        /// The type of the `inconsistent_span` argument.
347        inconsistent_ty: String,
348
349        /// The types that would have been accepted instead of the
350        /// first unacceptable argument.
351        allowed: Vec<String>,
352    },
353    FunctionReturnsVoid(Span),
354    FunctionMustUseUnused(Span),
355    FunctionMustUseReturnsVoid(Span, Span),
356    InvalidWorkGroupUniformLoad(Span),
357    Internal(&'static str),
358    ExpectedConstExprConcreteIntegerScalar(Span),
359    ExpectedNonNegative(Span),
360    ExpectedPositiveArrayLength(Span),
361    MissingWorkgroupSize(Span),
362    ConstantEvaluatorError(Box<ConstantEvaluatorError>, Span),
363    AutoConversion(Box<AutoConversionError>),
364    AutoConversionLeafScalar(Box<AutoConversionLeafScalarError>),
365    ConcretizationFailed(Box<ConcretizationFailedError>),
366    ExceededLimitForNestedBraces {
367        span: Span,
368        limit: u8,
369    },
370    PipelineConstantIDValue(Span),
371    NotBool(Span),
372    ConstAssertFailed(Span),
373    DirectiveAfterFirstGlobalDecl {
374        directive_span: Span,
375    },
376    EnableExtensionNotYetImplemented {
377        kind: UnimplementedEnableExtension,
378        span: Span,
379    },
380    EnableExtensionNotEnabled {
381        kind: EnableExtension,
382        span: Span,
383    },
384    LanguageExtensionNotYetImplemented {
385        kind: UnimplementedLanguageExtension,
386        span: Span,
387    },
388    DiagnosticInvalidSeverity {
389        severity_control_name_span: Span,
390    },
391    DiagnosticDuplicateTriggeringRule(ConflictingDiagnosticRuleError),
392    DiagnosticAttributeNotYetImplementedAtParseSite {
393        site_name_plural: &'static str,
394        spans: Vec<Span>,
395    },
396    DiagnosticAttributeNotSupported {
397        on_what: DiagnosticAttributeNotSupportedPosition,
398        spans: Vec<Span>,
399    },
400    SelectUnexpectedArgumentType {
401        arg_span: Span,
402        arg_type: String,
403    },
404    SelectRejectAndAcceptHaveNoCommonType {
405        reject_span: Span,
406        reject_type: String,
407        accept_span: Span,
408        accept_type: String,
409    },
410    ExpectedGlobalVariable {
411        name_span: Span,
412    },
413    StructMemberTooLarge {
414        member_name_span: Span,
415    },
416    TypeTooLarge {
417        span: Span,
418    },
419}
420
421impl From<ConflictingDiagnosticRuleError> for Error<'_> {
422    fn from(value: ConflictingDiagnosticRuleError) -> Self {
423        Self::DiagnosticDuplicateTriggeringRule(value)
424    }
425}
426
427/// Used for diagnostic refinement in [`Error::DiagnosticAttributeNotSupported`].
428#[derive(Clone, Copy, Debug)]
429pub(crate) enum DiagnosticAttributeNotSupportedPosition {
430    SemicolonInModulePosition,
431    Other { display_plural: &'static str },
432}
433
434impl From<&'static str> for DiagnosticAttributeNotSupportedPosition {
435    fn from(display_plural: &'static str) -> Self {
436        Self::Other { display_plural }
437    }
438}
439
440#[derive(Clone, Debug)]
441pub(crate) struct AutoConversionError {
442    pub dest_span: Span,
443    pub dest_type: String,
444    pub source_span: Span,
445    pub source_type: String,
446}
447
448#[derive(Clone, Debug)]
449pub(crate) struct AutoConversionLeafScalarError {
450    pub dest_span: Span,
451    pub dest_scalar: String,
452    pub source_span: Span,
453    pub source_type: String,
454}
455
456#[derive(Clone, Debug)]
457pub(crate) struct ConcretizationFailedError {
458    pub expr_span: Span,
459    pub expr_type: String,
460    pub scalar: String,
461    pub inner: ConstantEvaluatorError,
462}
463
464impl<'a> Error<'a> {
465    #[cold]
466    #[inline(never)]
467    pub(crate) fn as_parse_error(&self, source: &'a str) -> ParseError {
468        match *self {
469            Error::Unexpected(unexpected_span, expected) => {
470                let expected_str = match expected {
471                    ExpectedToken::Token(token) => match token {
472                        Token::Separator(c) => format!("`{c}`"),
473                        Token::Paren(c) => format!("`{c}`"),
474                        Token::Attribute => "@".to_string(),
475                        Token::Number(_) => "number".to_string(),
476                        Token::Word(s) => s.to_string(),
477                        Token::Operation(c) => format!("operation (`{c}`)"),
478                        Token::LogicalOperation(c) => format!("logical operation (`{c}`)"),
479                        Token::ShiftOperation(c) => format!("bitshift (`{c}{c}`)"),
480                        Token::AssignmentOperation(c) if c == '<' || c == '>' => {
481                            format!("bitshift (`{c}{c}=`)")
482                        }
483                        Token::AssignmentOperation(c) => format!("operation (`{c}=`)"),
484                        Token::IncrementOperation => "increment operation".to_string(),
485                        Token::DecrementOperation => "decrement operation".to_string(),
486                        Token::Arrow => "->".to_string(),
487                        Token::Unknown(c) => format!("unknown (`{c}`)"),
488                        Token::Trivia => "trivia".to_string(),
489                        Token::DocComment(s) => format!("doc comment ('{s}')"),
490                        Token::ModuleDocComment(s) => format!("module doc comment ('{s}')"),
491                        Token::End => "end".to_string(),
492                    },
493                    ExpectedToken::Identifier => "identifier".to_string(),
494                    ExpectedToken::PrimaryExpression => "expression".to_string(),
495                    ExpectedToken::Assignment => "assignment or increment/decrement".to_string(),
496                    ExpectedToken::SwitchItem => concat!(
497                        "switch item (`case` or `default`) or a closing curly bracket ",
498                        "to signify the end of the switch statement (`}`)"
499                    )
500                    .to_string(),
501                    ExpectedToken::WorkgroupSizeSeparator => {
502                        "workgroup size separator (`,`) or a closing parenthesis".to_string()
503                    }
504                    ExpectedToken::GlobalItem => concat!(
505                        "global item (`struct`, `const`, `var`, `alias`, ",
506                        "`fn`, `diagnostic`, `enable`, `requires`, `;`) ",
507                        "or the end of the file"
508                    )
509                    .to_string(),
510                    ExpectedToken::Type => "type".to_string(),
511                    ExpectedToken::Variable => "variable access".to_string(),
512                    ExpectedToken::Function => "function name".to_string(),
513                    ExpectedToken::AfterIdentListArg => {
514                        "next argument, trailing comma, or end of list (`,` or `;`)".to_string()
515                    }
516                    ExpectedToken::AfterIdentListComma => {
517                        "next argument or end of list (`;`)".to_string()
518                    }
519                    ExpectedToken::DiagnosticAttribute => {
520                        "the `diagnostic` attribute identifier".to_string()
521                    }
522                };
523                ParseError {
524                    message: format!(
525                        "expected {}, found {:?}",
526                        expected_str, &source[unexpected_span],
527                    ),
528                    labels: vec![(unexpected_span, format!("expected {expected_str}").into())],
529                    notes: vec![],
530                }
531            }
532            Error::UnexpectedComponents(bad_span) => ParseError {
533                message: "unexpected components".to_string(),
534                labels: vec![(bad_span, "unexpected components".into())],
535                notes: vec![],
536            },
537            Error::UnexpectedOperationInConstContext(span) => ParseError {
538                message: "this operation is not supported in a const context".to_string(),
539                labels: vec![(span, "operation not supported here".into())],
540                notes: vec![],
541            },
542            Error::BadNumber(bad_span, ref err) => ParseError {
543                message: format!("{}: `{}`", err, &source[bad_span],),
544                labels: vec![(bad_span, err.to_string().into())],
545                notes: vec![],
546            },
547            Error::BadMatrixScalarKind(span, scalar) => ParseError {
548                message: format!(
549                    "matrix scalar type must be floating-point, but found `{}`",
550                    scalar.to_wgsl_for_diagnostics()
551                ),
552                labels: vec![(span, "must be floating-point (e.g. `f32`)".into())],
553                notes: vec![],
554            },
555            Error::BadAccessor(accessor_span) => ParseError {
556                message: format!("invalid field accessor `{}`", &source[accessor_span],),
557                labels: vec![(accessor_span, "invalid accessor".into())],
558                notes: vec![],
559            },
560            Error::UnknownIdent(ident_span, ident) => ParseError {
561                message: format!("no definition in scope for identifier: `{ident}`"),
562                labels: vec![(ident_span, "unknown identifier".into())],
563                notes: vec![],
564            },
565            Error::UnknownScalarType(bad_span) => ParseError {
566                message: format!("unknown scalar type: `{}`", &source[bad_span]),
567                labels: vec![(bad_span, "unknown scalar type".into())],
568                notes: vec!["Valid scalar types are f32, f64, i32, u32, bool".into()],
569            },
570            Error::NotStorageTexture(bad_span) => ParseError {
571                message: "textureStore can only be applied to storage textures".to_string(),
572                labels: vec![(bad_span, "not a storage texture".into())],
573                notes: vec![],
574            },
575            Error::BadTextureSampleType { span, scalar } => ParseError {
576                message: format!(
577                    "texture sample type must be one of f32, i32 or u32, but found {}",
578                    scalar.to_wgsl_for_diagnostics()
579                ),
580                labels: vec![(span, "must be one of f32, i32 or u32".into())],
581                notes: vec![],
582            },
583            Error::BadIncrDecrReferenceType(span) => ParseError {
584                message: concat!(
585                    "increment/decrement operation requires ",
586                    "reference type to be one of i32 or u32"
587                )
588                .to_string(),
589                labels: vec![(span, "must be a reference type of i32 or u32".into())],
590                notes: vec![],
591            },
592            Error::BadTexture(bad_span) => ParseError {
593                message: format!(
594                    "expected an image, but found `{}` which is not an image",
595                    &source[bad_span]
596                ),
597                labels: vec![(bad_span, "not an image".into())],
598                notes: vec![],
599            },
600            Error::BadTypeCast {
601                span,
602                ref from_type,
603                ref to_type,
604            } => {
605                let msg = format!("cannot cast a {from_type} to a {to_type}");
606                ParseError {
607                    message: msg.clone(),
608                    labels: vec![(span, msg.into())],
609                    notes: vec![],
610                }
611            }
612            Error::InvalidResolve(ref resolve_error) => ParseError {
613                message: resolve_error.to_string(),
614                labels: vec![],
615                notes: vec![],
616            },
617            Error::InvalidForInitializer(bad_span) => ParseError {
618                message: format!(
619                    "for(;;) initializer is not an assignment or a function call: `{}`",
620                    &source[bad_span]
621                ),
622                labels: vec![(bad_span, "not an assignment or function call".into())],
623                notes: vec![],
624            },
625            Error::InvalidBreakIf(bad_span) => ParseError {
626                message: "A break if is only allowed in a continuing block".to_string(),
627                labels: vec![(bad_span, "not in a continuing block".into())],
628                notes: vec![],
629            },
630            Error::InvalidGatherComponent(bad_span) => ParseError {
631                message: format!(
632                    "textureGather component `{}` doesn't exist, must be 0, 1, 2, or 3",
633                    &source[bad_span]
634                ),
635                labels: vec![(bad_span, "invalid component".into())],
636                notes: vec![],
637            },
638            Error::InvalidConstructorComponentType(bad_span, component) => ParseError {
639                message: format!("invalid type for constructor component at index [{component}]"),
640                labels: vec![(bad_span, "invalid component type".into())],
641                notes: vec![],
642            },
643            Error::InvalidIdentifierUnderscore(bad_span) => ParseError {
644                message: "Identifier can't be `_`".to_string(),
645                labels: vec![(bad_span, "invalid identifier".into())],
646                notes: vec![
647                    "Use phony assignment instead (`_ =` notice the absence of `let` or `var`)"
648                        .to_string(),
649                ],
650            },
651            Error::ReservedIdentifierPrefix(bad_span) => ParseError {
652                message: format!(
653                    "Identifier starts with a reserved prefix: `{}`",
654                    &source[bad_span]
655                ),
656                labels: vec![(bad_span, "invalid identifier".into())],
657                notes: vec![],
658            },
659            Error::UnknownAddressSpace(bad_span) => ParseError {
660                message: format!("unknown address space: `{}`", &source[bad_span]),
661                labels: vec![(bad_span, "unknown address space".into())],
662                notes: vec![],
663            },
664            Error::InvalidLocalVariableAddressSpace(bad_span) => ParseError {
665                message: format!("invalid address space for local variable: `{}`", &source[bad_span]),
666                labels: vec![(bad_span, "local variables can only use 'function' address space".into())],
667                notes: vec![],
668            },
669            Error::RepeatedAttribute(bad_span) => ParseError {
670                message: format!("repeated attribute: `{}`", &source[bad_span]),
671                labels: vec![(bad_span, "repeated attribute".into())],
672                notes: vec![],
673            },
674            Error::UnknownAttribute(bad_span) => ParseError {
675                message: format!("unknown attribute: `{}`", &source[bad_span]),
676                labels: vec![(bad_span, "unknown attribute".into())],
677                notes: vec![],
678            },
679            Error::UnknownBuiltin(bad_span) => ParseError {
680                message: format!("unknown builtin: `{}`", &source[bad_span]),
681                labels: vec![(bad_span, "unknown builtin".into())],
682                notes: vec![],
683            },
684            Error::UnknownAccess(bad_span) => ParseError {
685                message: format!("unknown access: `{}`", &source[bad_span]),
686                labels: vec![(bad_span, "unknown access".into())],
687                notes: vec![],
688            },
689            Error::UnknownStorageFormat(bad_span) => ParseError {
690                message: format!("unknown storage format: `{}`", &source[bad_span]),
691                labels: vec![(bad_span, "unknown storage format".into())],
692                notes: vec![],
693            },
694            Error::UnknownConservativeDepth(bad_span) => ParseError {
695                message: format!("unknown conservative depth: `{}`", &source[bad_span]),
696                labels: vec![(bad_span, "unknown conservative depth".into())],
697                notes: vec![],
698            },
699            Error::UnknownType(bad_span) => ParseError {
700                message: format!("unknown type: `{}`", &source[bad_span]),
701                labels: vec![(bad_span, "unknown type".into())],
702                notes: vec![],
703            },
704            Error::UnknownEnableExtension(span, word) => ParseError {
705                message: format!("unknown enable-extension `{word}`"),
706                labels: vec![(span, "".into())],
707                notes: vec![
708                    "See available extensions at <https://www.w3.org/TR/WGSL/#enable-extension>."
709                        .into(),
710                ],
711            },
712            Error::UnknownLanguageExtension(span, name) => ParseError {
713                message: format!("unknown language extension `{name}`"),
714                labels: vec![(span, "".into())],
715                notes: vec![concat!(
716                    "See available extensions at ",
717                    "<https://www.w3.org/TR/WGSL/#language-extensions-sec>."
718                )
719                .into()],
720            },
721            Error::UnknownDiagnosticRuleName(span) => ParseError {
722                message: format!("unknown `diagnostic(…)` rule name `{}`", &source[span]),
723                labels: vec![(span, "not a valid diagnostic rule name".into())],
724                notes: vec![concat!(
725                    "See available trigger rules at ",
726                    "<https://www.w3.org/TR/WGSL/#filterable-triggering-rules>."
727                )
728                .into()],
729            },
730            Error::SizeAttributeTooLow(bad_span, min_size) => ParseError {
731                message: format!("struct member size must be at least {min_size}"),
732                labels: vec![(bad_span, format!("must be at least {min_size}").into())],
733                notes: vec![],
734            },
735            Error::AlignAttributeTooLow(bad_span, min_align) => ParseError {
736                message: format!("struct member alignment must be at least {min_align}"),
737                labels: vec![(bad_span, format!("must be at least {min_align}").into())],
738                notes: vec![],
739            },
740            Error::NonPowerOfTwoAlignAttribute(bad_span) => ParseError {
741                message: "struct member alignment must be a power of 2".to_string(),
742                labels: vec![(bad_span, "must be a power of 2".into())],
743                notes: vec![],
744            },
745            Error::InconsistentBinding(span) => ParseError {
746                message: "input/output binding is not consistent".to_string(),
747                labels: vec![(span, "input/output binding is not consistent".into())],
748                notes: vec![],
749            },
750            Error::TypeNotConstructible(span) => ParseError {
751                message: format!("type `{}` is not constructible", &source[span]),
752                labels: vec![(span, "type is not constructible".into())],
753                notes: vec![],
754            },
755            Error::TypeNotInferable(span) => ParseError {
756                message: "type can't be inferred".to_string(),
757                labels: vec![(span, "type can't be inferred".into())],
758                notes: vec![],
759            },
760            Error::InitializationTypeMismatch {
761                name,
762                ref expected,
763                ref got,
764            } => ParseError {
765                message: format!(
766                    "the type of `{}` is expected to be `{}`, but got `{}`",
767                    &source[name], expected, got,
768                ),
769                labels: vec![(name, format!("definition of `{}`", &source[name]).into())],
770                notes: vec![],
771            },
772            Error::DeclMissingTypeAndInit(name_span) => ParseError {
773                message: format!(
774                    "declaration of `{}` needs a type specifier or initializer",
775                    &source[name_span]
776                ),
777                labels: vec![(name_span, "needs a type specifier or initializer".into())],
778                notes: vec![],
779            },
780            Error::MissingAttribute(name, name_span) => ParseError {
781                message: format!(
782                    "variable `{}` needs a '{}' attribute",
783                    &source[name_span], name
784                ),
785                labels: vec![(
786                    name_span,
787                    format!("definition of `{}`", &source[name_span]).into(),
788                )],
789                notes: vec![],
790            },
791            Error::InvalidAddrOfOperand(span) => ParseError {
792                message: "cannot take the address of a vector component".to_string(),
793                labels: vec![(span, "invalid operand for address-of".into())],
794                notes: vec![],
795            },
796            Error::InvalidAtomicPointer(span) => ParseError {
797                message: "atomic operation is done on a pointer to a non-atomic".to_string(),
798                labels: vec![(span, "atomic pointer is invalid".into())],
799                notes: vec![],
800            },
801            Error::InvalidAtomicOperandType(span) => ParseError {
802                message: "atomic operand type is inconsistent with the operation".to_string(),
803                labels: vec![(span, "atomic operand type is invalid".into())],
804                notes: vec![],
805            },
806            Error::InvalidRayQueryPointer(span) => ParseError {
807                message: "ray query operation is done on a pointer to a non-ray-query".to_string(),
808                labels: vec![(span, "ray query pointer is invalid".into())],
809                notes: vec![],
810            },
811            Error::NotPointer(span) => ParseError {
812                message: "the operand of the `*` operator must be a pointer".to_string(),
813                labels: vec![(span, "expression is not a pointer".into())],
814                notes: vec![],
815            },
816            Error::NotReference(what, span) => ParseError {
817                message: format!("{what} must be a reference"),
818                labels: vec![(span, "expression is not a reference".into())],
819                notes: vec![],
820            },
821            Error::InvalidAssignment { span, ty } => {
822                let (extra_label, notes) = match ty {
823                    InvalidAssignmentType::Swizzle => (
824                        None,
825                        vec![
826                            "WGSL does not support assignments to swizzles".into(),
827                            "consider assigning each component individually".into(),
828                        ],
829                    ),
830                    InvalidAssignmentType::ImmutableBinding(binding_span) => (
831                        Some((binding_span, "this is an immutable binding".into())),
832                        vec![format!(
833                            "consider declaring `{}` with `var` instead of `let`",
834                            &source[binding_span]
835                        )],
836                    ),
837                    InvalidAssignmentType::Other => (None, vec![]),
838                };
839
840                ParseError {
841                    message: "invalid left-hand side of assignment".into(),
842                    labels: core::iter::once((span, "cannot assign to this expression".into()))
843                        .chain(extra_label)
844                        .collect(),
845                    notes,
846                }
847            }
848            Error::ReservedKeyword(name_span) => ParseError {
849                message: format!("name `{}` is a reserved keyword", &source[name_span]),
850                labels: vec![(
851                    name_span,
852                    format!("definition of `{}`", &source[name_span]).into(),
853                )],
854                notes: vec![],
855            },
856            Error::Redefinition { previous, current } => ParseError {
857                message: format!("redefinition of `{}`", &source[current]),
858                labels: vec![
859                    (
860                        current,
861                        format!("redefinition of `{}`", &source[current]).into(),
862                    ),
863                    (
864                        previous,
865                        format!("previous definition of `{}`", &source[previous]).into(),
866                    ),
867                ],
868                notes: vec![],
869            },
870            Error::RecursiveDeclaration { ident, usage } => ParseError {
871                message: format!("declaration of `{}` is recursive", &source[ident]),
872                labels: vec![(ident, "".into()), (usage, "uses itself here".into())],
873                notes: vec![],
874            },
875            Error::CyclicDeclaration { ident, ref path } => ParseError {
876                message: format!("declaration of `{}` is cyclic", &source[ident]),
877                labels: path
878                    .iter()
879                    .enumerate()
880                    .flat_map(|(i, &(ident, usage))| {
881                        [
882                            (ident, "".into()),
883                            (
884                                usage,
885                                if i == path.len() - 1 {
886                                    "ending the cycle".into()
887                                } else {
888                                    format!("uses `{}`", &source[ident]).into()
889                                },
890                            ),
891                        ]
892                    })
893                    .collect(),
894                notes: vec![],
895            },
896            Error::InvalidSwitchSelector { span } => ParseError {
897                message: "invalid `switch` selector".to_string(),
898                labels: vec![(
899                    span,
900                    "`switch` selector must be a scalar integer"
901                    .into(),
902                )],
903                notes: vec![],
904            },
905            Error::InvalidSwitchCase { span } => ParseError {
906                message: "invalid `switch` case selector value".to_string(),
907                labels: vec![(
908                    span,
909                    "`switch` case selector must be a scalar integer const expression"
910                    .into(),
911                )],
912                notes: vec![],
913            },
914            Error::SwitchCaseTypeMismatch { span } => ParseError {
915                message: "invalid `switch` case selector value".to_string(),
916                labels: vec![(
917                    span,
918                    "`switch` case selector must have the same type as the `switch` selector expression"
919                    .into(),
920                )],
921                notes: vec![],
922            },
923            Error::CalledEntryPoint(span) => ParseError {
924                message: "entry point cannot be called".to_string(),
925                labels: vec![(span, "entry point cannot be called".into())],
926                notes: vec![],
927            },
928            Error::WrongArgumentCount {
929                span,
930                ref expected,
931                found,
932            } => ParseError {
933                message: format!(
934                    "wrong number of arguments: expected {}, found {}",
935                    if expected.len() < 2 {
936                        format!("{}", expected.start)
937                    } else {
938                        format!("{}..{}", expected.start, expected.end)
939                    },
940                    found
941                ),
942                labels: vec![(span, "wrong number of arguments".into())],
943                notes: vec![],
944            },
945            Error::TooManyArguments {
946                ref function,
947                call_span,
948                arg_span,
949                max_arguments,
950            } => ParseError {
951                message: format!("too many arguments passed to `{function}`"),
952                labels: vec![
953                    (call_span, "".into()),
954                    (arg_span, format!("unexpected argument #{}", max_arguments + 1).into())
955                ],
956                notes: vec![
957                    format!("The `{function}` function accepts at most {max_arguments} argument(s)")
958                ],
959            },
960            Error::WrongArgumentType {
961                ref function,
962                call_span,
963                arg_span,
964                arg_index,
965                ref arg_ty,
966                ref allowed,
967            } => {
968                let message = format!(
969                    "wrong type passed as argument #{} to `{function}`",
970                    arg_index + 1,
971                );
972                let labels = vec![
973                    (call_span, "".into()),
974                    (arg_span, format!("argument #{} has type `{arg_ty}`", arg_index + 1).into())
975                ];
976
977                let mut notes = vec![];
978                notes.push(format!("`{function}` accepts the following types for argument #{}:", arg_index + 1));
979                notes.extend(allowed.iter().map(|ty| format!("allowed type: {ty}")));
980
981                ParseError { message, labels, notes }
982            },
983            Error::InconsistentArgumentType {
984                ref function,
985                call_span,
986                arg_span,
987                arg_index,
988                ref arg_ty,
989                inconsistent_span,
990                inconsistent_index,
991                ref inconsistent_ty,
992                ref allowed
993            } => {
994                let message = format!(
995                    "inconsistent type passed as argument #{} to `{function}`",
996                    arg_index + 1,
997                );
998                let labels = vec![
999                    (call_span, "".into()),
1000                    (arg_span, format!("argument #{} has type {arg_ty}", arg_index + 1).into()),
1001                    (inconsistent_span, format!(
1002                        "this argument has type {inconsistent_ty}, which constrains subsequent arguments"
1003                    ).into()),
1004                ];
1005                let mut notes = vec![
1006                    format!("Because argument #{} has type {inconsistent_ty}, only the following types", inconsistent_index + 1),
1007                    format!("(or types that automatically convert to them) are accepted for argument #{}:", arg_index + 1),
1008                ];
1009                notes.extend(allowed.iter().map(|ty| format!("allowed type: {ty}")));
1010
1011                ParseError { message, labels, notes }
1012            }
1013            Error::FunctionReturnsVoid(span) => ParseError {
1014                message: "function does not return any value".to_string(),
1015                labels: vec![(span, "".into())],
1016                notes: vec![
1017                    "perhaps you meant to call the function in a separate statement?".into(),
1018                ],
1019            },
1020            Error::FunctionMustUseUnused(call) => ParseError {
1021                message: "unused return value from function annotated with @must_use".into(),
1022                labels: vec![(call, "".into())],
1023                notes: vec![
1024                    format!(
1025                        "function '{}' is declared with `@must_use` attribute",
1026                        &source[call],
1027                    ),
1028                    "use a phony assignment or declare a value using the function call as the initializer".into(),
1029                ],
1030            },
1031            Error::FunctionMustUseReturnsVoid(attr, signature) => ParseError {
1032                message: "function annotated with @must_use but does not return any value".into(),
1033                labels: vec![
1034                    (attr, "".into()),
1035                    (signature, "".into()),
1036                ],
1037                notes: vec![
1038                    "declare a return type or remove the attribute".into(),
1039                ],
1040            },
1041            Error::InvalidWorkGroupUniformLoad(span) => ParseError {
1042                message: "incorrect type passed to workgroupUniformLoad".into(),
1043                labels: vec![(span, "".into())],
1044                notes: vec!["passed type must be a workgroup pointer".into()],
1045            },
1046            Error::Internal(message) => ParseError {
1047                message: "internal WGSL front end error".to_string(),
1048                labels: vec![],
1049                notes: vec![message.into()],
1050            },
1051            Error::ExpectedConstExprConcreteIntegerScalar(span) => ParseError {
1052                message: concat!(
1053                    "must be a const-expression that ",
1054                    "resolves to a concrete integer scalar (`u32` or `i32`)"
1055                )
1056                .to_string(),
1057                labels: vec![(span, "must resolve to `u32` or `i32`".into())],
1058                notes: vec![],
1059            },
1060            Error::ExpectedNonNegative(span) => ParseError {
1061                message: "must be non-negative (>= 0)".to_string(),
1062                labels: vec![(span, "must be non-negative".into())],
1063                notes: vec![],
1064            },
1065            Error::ExpectedPositiveArrayLength(span) => ParseError {
1066                message: "array element count must be positive (> 0)".to_string(),
1067                labels: vec![(span, "must be positive".into())],
1068                notes: vec![],
1069            },
1070            Error::ConstantEvaluatorError(ref e, span) => ParseError {
1071                message: e.to_string(),
1072                labels: vec![(span, "see msg".into())],
1073                notes: vec![],
1074            },
1075            Error::MissingWorkgroupSize(span) => ParseError {
1076                message: "workgroup size is missing on compute shader entry point".to_string(),
1077                labels: vec![(
1078                    span,
1079                    "must be paired with a `@workgroup_size` attribute".into(),
1080                )],
1081                notes: vec![],
1082            },
1083            Error::AutoConversion(ref error) => {
1084                // destructuring ensures all fields are handled
1085                let AutoConversionError {
1086                    dest_span,
1087                    ref dest_type,
1088                    source_span,
1089                    ref source_type,
1090                } = **error;
1091                ParseError {
1092                    message: format!(
1093                        "automatic conversions cannot convert `{source_type}` to `{dest_type}`"
1094                    ),
1095                    labels: vec![
1096                        (
1097                            dest_span,
1098                            format!("a value of type {dest_type} is required here").into(),
1099                        ),
1100                        (
1101                            source_span,
1102                            format!("this expression has type {source_type}").into(),
1103                        ),
1104                    ],
1105                    notes: vec![],
1106                }
1107            }
1108            Error::AutoConversionLeafScalar(ref error) => {
1109                let AutoConversionLeafScalarError {
1110                    dest_span,
1111                    ref dest_scalar,
1112                    source_span,
1113                    ref source_type,
1114                } = **error;
1115                ParseError {
1116                    message: format!(
1117                        "automatic conversions cannot convert elements of `{source_type}` to `{dest_scalar}`"
1118                    ),
1119                    labels: vec![
1120                        (
1121                            dest_span,
1122                            format!(
1123                                "a value with elements of type {dest_scalar} is required here"
1124                            )
1125                            .into(),
1126                        ),
1127                        (
1128                            source_span,
1129                            format!("this expression has type {source_type}").into(),
1130                        ),
1131                    ],
1132                    notes: vec![],
1133                }
1134            }
1135            Error::ConcretizationFailed(ref error) => {
1136                let ConcretizationFailedError {
1137                    expr_span,
1138                    ref expr_type,
1139                    ref scalar,
1140                    ref inner,
1141                } = **error;
1142                ParseError {
1143                    message: format!("failed to convert expression to a concrete type: {inner}"),
1144                    labels: vec![(
1145                        expr_span,
1146                        format!("this expression has type {expr_type}").into(),
1147                    )],
1148                    notes: vec![format!(
1149                        "the expression should have been converted to have {} scalar type",
1150                        scalar
1151                    )],
1152                }
1153            }
1154            Error::ExceededLimitForNestedBraces { span, limit } => ParseError {
1155                message: "brace nesting limit reached".into(),
1156                labels: vec![(span, "limit reached at this brace".into())],
1157                notes: vec![format!("nesting limit is currently set to {limit}")],
1158            },
1159            Error::PipelineConstantIDValue(span) => ParseError {
1160                message: "pipeline constant ID must be between 0 and 65535 inclusive".to_string(),
1161                labels: vec![(span, "must be between 0 and 65535 inclusive".into())],
1162                notes: vec![],
1163            },
1164            Error::NotBool(span) => ParseError {
1165                message: "must be a const-expression that resolves to a `bool`".to_string(),
1166                labels: vec![(span, "must resolve to `bool`".into())],
1167                notes: vec![],
1168            },
1169            Error::ConstAssertFailed(span) => ParseError {
1170                message: "`const_assert` failure".to_string(),
1171                labels: vec![(span, "evaluates to `false`".into())],
1172                notes: vec![],
1173            },
1174            Error::DirectiveAfterFirstGlobalDecl { directive_span } => ParseError {
1175                message: "expected global declaration, but found a global directive".into(),
1176                labels: vec![(
1177                    directive_span,
1178                    "written after first global declaration".into(),
1179                )],
1180                notes: vec![concat!(
1181                    "global directives are only allowed before global declarations; ",
1182                    "maybe hoist this closer to the top of the shader module?"
1183                )
1184                .into()],
1185            },
1186            Error::EnableExtensionNotYetImplemented { kind, span } => ParseError {
1187                message: format!(
1188                    "the `{}` enable-extension is not yet supported",
1189                    EnableExtension::Unimplemented(kind).to_ident()
1190                ),
1191                labels: vec![(
1192                    span,
1193                    concat!(
1194                        "this enable-extension specifies standard functionality ",
1195                        "which is not yet implemented in Naga"
1196                    )
1197                    .into(),
1198                )],
1199                notes: vec![format!(
1200                    concat!(
1201                        "Let Naga maintainers know that you ran into this at ",
1202                        "<https://github.com/gfx-rs/wgpu/issues/{}>, ",
1203                        "so they can prioritize it!"
1204                    ),
1205                    kind.tracking_issue_num()
1206                )],
1207            },
1208            Error::EnableExtensionNotEnabled { kind, span } => ParseError {
1209                message: format!("the `{}` enable extension is not enabled", kind.to_ident()),
1210                labels: vec![(
1211                    span,
1212                    format!(
1213                        concat!(
1214                            "the `{}` \"Enable Extension\" is needed for this functionality, ",
1215                            "but it is not currently enabled."
1216                        ),
1217                        kind.to_ident()
1218                    )
1219                    .into(),
1220                )],
1221                notes: if let EnableExtension::Unimplemented(kind) = kind {
1222                    vec![format!(
1223                        concat!(
1224                            "This \"Enable Extension\" is not yet implemented. ",
1225                            "Let Naga maintainers know that you ran into this at ",
1226                            "<https://github.com/gfx-rs/wgpu/issues/{}>, ",
1227                            "so they can prioritize it!"
1228                        ),
1229                        kind.tracking_issue_num()
1230                    )]
1231                } else {
1232                    vec![
1233                        format!(
1234                            "You can enable this extension by adding `enable {};` at the top of the shader, before any other items.",
1235                            kind.to_ident()
1236                        ),
1237                    ]
1238                },
1239            },
1240            Error::LanguageExtensionNotYetImplemented { kind, span } => ParseError {
1241                message: format!(
1242                    "the `{}` language extension is not yet supported",
1243                    LanguageExtension::Unimplemented(kind).to_ident()
1244                ),
1245                labels: vec![(span, "".into())],
1246                notes: vec![format!(
1247                    concat!(
1248                        "Let Naga maintainers know that you ran into this at ",
1249                        "<https://github.com/gfx-rs/wgpu/issues/{}>, ",
1250                        "so they can prioritize it!"
1251                    ),
1252                    kind.tracking_issue_num()
1253                )],
1254            },
1255            Error::DiagnosticInvalidSeverity {
1256                severity_control_name_span,
1257            } => ParseError {
1258                message: "invalid `diagnostic(…)` severity".into(),
1259                labels: vec![(
1260                    severity_control_name_span,
1261                    "not a valid severity level".into(),
1262                )],
1263                notes: vec![concat!(
1264                    "See available severities at ",
1265                    "<https://www.w3.org/TR/WGSL/#diagnostic-severity>."
1266                )
1267                .into()],
1268            },
1269            Error::DiagnosticDuplicateTriggeringRule(ConflictingDiagnosticRuleError {
1270                triggering_rule_spans,
1271            }) => {
1272                let [first_span, second_span] = triggering_rule_spans;
1273                ParseError {
1274                    message: "found conflicting `diagnostic(…)` rule(s)".into(),
1275                    labels: vec![
1276                        (first_span, "first rule".into()),
1277                        (second_span, "second rule".into()),
1278                    ],
1279                    notes: vec![
1280                        concat!(
1281                            "Multiple `diagnostic(…)` rules with the same rule name ",
1282                            "conflict unless they are directives and the severity is the same.",
1283                        )
1284                        .into(),
1285                        "You should delete the rule you don't want.".into(),
1286                    ],
1287                }
1288            }
1289            Error::DiagnosticAttributeNotYetImplementedAtParseSite {
1290                site_name_plural,
1291                ref spans,
1292            } => ParseError {
1293                message: "`@diagnostic(…)` attribute(s) not yet implemented".into(),
1294                labels: {
1295                    let mut spans = spans.iter().cloned();
1296                    let first = spans
1297                        .next()
1298                        .map(|span| {
1299                            (
1300                                span,
1301                                format!("can't use this on {site_name_plural} (yet)").into(),
1302                            )
1303                        })
1304                        .expect("internal error: diag. attr. rejection on empty map");
1305                    core::iter::once(first)
1306                        .chain(spans.map(|span| (span, "".into())))
1307                        .collect()
1308                },
1309                notes: vec![format!(concat!(
1310                    "Let Naga maintainers know that you ran into this at ",
1311                    "<https://github.com/gfx-rs/wgpu/issues/5320>, ",
1312                    "so they can prioritize it!"
1313                ))],
1314            },
1315            Error::DiagnosticAttributeNotSupported { on_what, ref spans } => {
1316                // In this case the user may have intended to create a global diagnostic filter directive,
1317                // so display a note to them suggesting the correct syntax.
1318                let intended_diagnostic_directive = match on_what {
1319                    DiagnosticAttributeNotSupportedPosition::SemicolonInModulePosition => true,
1320                    DiagnosticAttributeNotSupportedPosition::Other { .. } => false,
1321                };
1322                let on_what_plural = match on_what {
1323                    DiagnosticAttributeNotSupportedPosition::SemicolonInModulePosition => {
1324                        "semicolons"
1325                    }
1326                    DiagnosticAttributeNotSupportedPosition::Other { display_plural } => {
1327                        display_plural
1328                    }
1329                };
1330                ParseError {
1331                    message: format!(
1332                        "`@diagnostic(…)` attribute(s) on {on_what_plural} are not supported",
1333                    ),
1334                    labels: spans
1335                        .iter()
1336                        .cloned()
1337                        .map(|span| (span, "".into()))
1338                        .collect(),
1339                    notes: vec![
1340                        concat!(
1341                            "`@diagnostic(…)` attributes are only permitted on `fn`s, ",
1342                            "some statements, and `switch`/`loop` bodies."
1343                        )
1344                        .into(),
1345                        {
1346                            if intended_diagnostic_directive {
1347                                concat!(
1348                                    "If you meant to declare a diagnostic filter that ",
1349                                    "applies to the entire module, move this line to ",
1350                                    "the top of the file and remove the `@` symbol."
1351                                )
1352                                .into()
1353                            } else {
1354                                concat!(
1355                                    "These attributes are well-formed, ",
1356                                    "you likely just need to move them."
1357                                )
1358                                .into()
1359                            }
1360                        },
1361                    ],
1362                }
1363            }
1364            Error::SelectUnexpectedArgumentType { arg_span, ref arg_type } => ParseError {
1365                message: "unexpected argument type for `select` call".into(),
1366                labels: vec![(arg_span, format!("this value of type {arg_type}").into())],
1367                notes: vec!["expected a scalar or a `vecN` of scalars".into()],
1368            },
1369            Error::SelectRejectAndAcceptHaveNoCommonType {
1370                reject_span,
1371                ref reject_type,
1372                accept_span,
1373                ref accept_type,
1374            } => ParseError {
1375                message: "type mismatch for reject and accept values in `select` call".into(),
1376                labels: vec![
1377                    (reject_span, format!("reject value of type {reject_type}").into()),
1378                    (accept_span, format!("accept value of type {accept_type}").into()),
1379                ],
1380                notes: vec![],
1381            },
1382            Error::ExpectedGlobalVariable { name_span } => ParseError {
1383                message: "expected global variable".to_string(),
1384                labels: vec![(name_span, "variable used here".into())],
1385                notes: vec![],
1386            },
1387            Error::StructMemberTooLarge { member_name_span } => ParseError {
1388                message: "struct member is too large".into(),
1389                labels: vec![(member_name_span, "this member exceeds the maximum size".into())],
1390                notes: vec![format!(
1391                    "the maximum size is {} bytes",
1392                    crate::valid::MAX_TYPE_SIZE
1393                )],
1394            },
1395            Error::TypeTooLarge { span } => ParseError {
1396                message: "type is too large".into(),
1397                labels: vec![(span, "this type exceeds the maximum size".into())],
1398                notes: vec![format!(
1399                    "the maximum size is {} bytes",
1400                    crate::valid::MAX_TYPE_SIZE
1401                )],
1402            },
1403        }
1404    }
1405}
naga/front/wgsl/error.rs

naga/front/wgsl/
error.rs
