diff options
Diffstat (limited to 'compiler/rustc_parse/src/parser/diagnostics.rs')
-rw-r--r-- | compiler/rustc_parse/src/parser/diagnostics.rs | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs index 36883bd2172..3002f23da75 100644 --- a/compiler/rustc_parse/src/parser/diagnostics.rs +++ b/compiler/rustc_parse/src/parser/diagnostics.rs @@ -13,7 +13,7 @@ use crate::errors::{ IncorrectUseOfAwait, ParenthesesInForHead, ParenthesesInForHeadSugg, PatternMethodParamWithoutBody, QuestionMarkInType, QuestionMarkInTypeSugg, SelfParamNotFirst, StructLiteralBodyWithoutPath, StructLiteralBodyWithoutPathSugg, StructLiteralNeedingParens, - StructLiteralNeedingParensSugg, SuggEscapeIdentifier, SuggRemoveComma, + StructLiteralNeedingParensSugg, SuggAddMissingLetStmt, SuggEscapeIdentifier, SuggRemoveComma, UnexpectedConstInGenericParam, UnexpectedConstParamDeclaration, UnexpectedConstParamDeclarationSugg, UnmatchedAngleBrackets, UseEqInstead, }; @@ -32,8 +32,8 @@ use rustc_ast::{ use rustc_ast_pretty::pprust; use rustc_data_structures::fx::FxHashSet; use rustc_errors::{ - pluralize, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, - FatalError, Handler, IntoDiagnostic, MultiSpan, PResult, + pluralize, AddToDiagnostic, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticMessage, + ErrorGuaranteed, FatalError, Handler, IntoDiagnostic, MultiSpan, PResult, }; use rustc_session::errors::ExprParenthesesNeeded; use rustc_span::source_map::Spanned; @@ -1006,6 +1006,31 @@ impl<'a> Parser<'a> { Err(e) } + /// Suggest add the missing `let` before the identifier in stmt + /// `a: Ty = 1` -> `let a: Ty = 1` + pub(super) fn suggest_add_missing_let_for_stmt( + &mut self, + err: &mut DiagnosticBuilder<'a, ErrorGuaranteed>, + ) { + if self.token == token::Colon { + let prev_span = self.prev_token.span.shrink_to_lo(); + let snapshot = self.create_snapshot_for_diagnostic(); + self.bump(); + match self.parse_ty() { + Ok(_) => { + if self.token == token::Eq { + let sugg = SuggAddMissingLetStmt { span: prev_span }; + sugg.add_to_diagnostic(err); + } + } + Err(e) => { + e.cancel(); + } + } + self.restore_snapshot(snapshot); + } + } + /// Check to see if a pair of chained operators looks like an attempt at chained comparison, /// e.g. `1 < x <= 3`. If so, suggest either splitting the comparison into two, or /// parenthesising the leftmost comparison. |