bjoernager/rust
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add hint for =< as <=

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Zachary Mayhew 2023-05-04 23:31:04 -04:00
parent 74c4821045
commit a183ac6f90
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GPG key ID: 8480D2FB40A25871
3 changed files with 79 additions and 1 deletions
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13
compiler/rustc_parse/src/parser/expr.rs
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@ -1448,8 +1448,19 @@ impl<'a> Parser<'a> {
}
fn parse_expr_path_start(&mut self) -> PResult<'a, P<Expr>> {
let maybe_eq_tok = self.prev_token.clone();
let (qself, path) = if self.eat_lt() {
let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
let lt_span = self.prev_token.span;
let (qself, path) = self.parse_qpath(PathStyle::Expr).map_err(|mut err| {
// Suggests using '<=' if there is an error parsing qpath when the previous token
// is an '=' token. Only emits suggestion if the '<' token and '=' token are
// directly adjacent (i.e. '=<')
if maybe_eq_tok.kind == TokenKind::Eq && maybe_eq_tok.span.hi() == lt_span.lo() {
let eq_lt = maybe_eq_tok.span.to(lt_span);
err.span_suggestion(eq_lt, "did you mean", "<=", Applicability::Unspecified);
}
err
})?;
(Some(qself), path)
} else {
(None, self.parse_path(PathStyle::Expr)?)