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Improve compiler error for c-strings in pre-2021

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This commit is contained in:
Carter Hunt Fogelman 2023-12-06 16:56:45 -08:00
parent 84a554cda9
commit 2c96025874
3 changed files with 158 additions and 7 deletions
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36
compiler/rustc_parse/src/parser/diagnostics.rs
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@ -10,13 +10,13 @@ use crate::errors::{
ConstGenericWithoutBracesSugg, DocCommentDoesNotDocumentAnything, DocCommentOnParamType,
DoubleColonInBound, ExpectedIdentifier, ExpectedSemi, ExpectedSemiSugg,
GenericParamsWithoutAngleBrackets, GenericParamsWithoutAngleBracketsSugg,
HelpIdentifierStartsWithNumber, InInTypo, IncorrectAwait, IncorrectSemicolon,
IncorrectUseOfAwait, PatternMethodParamWithoutBody, QuestionMarkInType, QuestionMarkInTypeSugg,
SelfParamNotFirst, StructLiteralBodyWithoutPath, StructLiteralBodyWithoutPathSugg,
StructLiteralNeedingParens, StructLiteralNeedingParensSugg, SuggAddMissingLetStmt,
SuggEscapeIdentifier, SuggRemoveComma, TernaryOperator, UnexpectedConstInGenericParam,
UnexpectedConstParamDeclaration, UnexpectedConstParamDeclarationSugg, UnmatchedAngleBrackets,
UseEqInstead, WrapType,
HelpIdentifierStartsWithNumber, HelpUseLatestEdition, InInTypo, IncorrectAwait,
IncorrectSemicolon, IncorrectUseOfAwait, PatternMethodParamWithoutBody, QuestionMarkInType,
QuestionMarkInTypeSugg, SelfParamNotFirst, StructLiteralBodyWithoutPath,
StructLiteralBodyWithoutPathSugg, StructLiteralNeedingParens, StructLiteralNeedingParensSugg,
SuggAddMissingLetStmt, SuggEscapeIdentifier, SuggRemoveComma, TernaryOperator,
UnexpectedConstInGenericParam, UnexpectedConstParamDeclaration,
UnexpectedConstParamDeclarationSugg, UnmatchedAngleBrackets, UseEqInstead, WrapType,
};
use crate::fluent_generated as fluent;
use crate::parser;
@ -640,6 +640,28 @@ impl<'a> Parser<'a> {
}
}
// Try to detect an intended c-string literal while using a pre-2021 edition. The heuristic
// here is to identify a cooked, uninterpolated `c` id immediately followed by a string, or
// a cooked, uninterpolated `cr` id immediately followed by a string or a `#`, in an edition
// where c-string literals are not allowed. There is the very slight possibility of a false
// positive for a `cr#` that wasn't intended to start a c-string literal, but identifying
// that in the parser requires unbounded lookahead, so we only add a hint to the existing
// error rather than replacing it entirely.
if ((self.prev_token.kind == TokenKind::Ident(sym::c, false)
&& matches!(&self.token.kind, TokenKind::Literal(token::Lit { kind: token::Str, .. })))
|| (self.prev_token.kind == TokenKind::Ident(sym::cr, false)
&& matches!(
&self.token.kind,
TokenKind::Literal(token::Lit { kind: token::Str, .. }) | token::Pound
)))
&& self.prev_token.span.hi() == self.token.span.lo()
&& !self.token.span.at_least_rust_2021()
{
err.note("you may be trying to write a c-string literal");
err.note("c-string literals require Rust 2021 or later");
HelpUseLatestEdition::new().add_to_diagnostic(&mut err);
}
// `pub` may be used for an item or `pub(crate)`
if self.prev_token.is_ident_named(sym::public)
&& (self.token.can_begin_item()