diff options
Diffstat (limited to 'compiler/rustc_parse/src/parser')
| -rw-r--r-- | compiler/rustc_parse/src/parser/diagnostics.rs | 45 | ||||
| -rw-r--r-- | compiler/rustc_parse/src/parser/expr.rs | 2 |
2 files changed, 27 insertions, 20 deletions
diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs index 4fccfc287fd..708df5e46d4 100644 --- a/compiler/rustc_parse/src/parser/diagnostics.rs +++ b/compiler/rustc_parse/src/parser/diagnostics.rs @@ -1334,30 +1334,25 @@ impl<'a> Parser<'a> { pub(super) fn recover_parens_around_for_head( &mut self, pat: P<Pat>, - expr: &Expr, begin_paren: Option<Span>, ) -> P<Pat> { match (&self.token.kind, begin_paren) { (token::CloseDelim(token::Paren), Some(begin_par_sp)) => { self.bump(); - let pat_str = self - // Remove the `(` from the span of the pattern: - .span_to_snippet(pat.span.trim_start(begin_par_sp).unwrap()) - .unwrap_or_else(|_| pprust::pat_to_string(&pat)); - - self.struct_span_err(self.prev_token.span, "unexpected closing `)`") - .span_label(begin_par_sp, "opening `(`") - .span_suggestion( - begin_par_sp.to(self.prev_token.span), - "remove parenthesis in `for` loop", - format!("{} in {}", pat_str, pprust::expr_to_string(&expr)), - // With e.g. `for (x) in y)` this would replace `(x) in y)` - // with `x) in y)` which is syntactically invalid. - // However, this is prevented before we get here. - Applicability::MachineApplicable, - ) - .emit(); + self.struct_span_err( + MultiSpan::from_spans(vec![begin_par_sp, self.prev_token.span]), + "unexpected parenthesis surrounding `for` loop head", + ) + .multipart_suggestion( + "remove parenthesis in `for` loop", + vec![(begin_par_sp, String::new()), (self.prev_token.span, String::new())], + // With e.g. `for (x) in y)` this would replace `(x) in y)` + // with `x) in y)` which is syntactically invalid. + // However, this is prevented before we get here. + Applicability::MachineApplicable, + ) + .emit(); // Unwrap `(pat)` into `pat` to avoid the `unused_parens` lint. pat.and_then(|pat| match pat.kind { @@ -1955,7 +1950,19 @@ impl<'a> Parser<'a> { } match self.parse_expr_res(Restrictions::CONST_EXPR, None) { Ok(expr) => { - if token::Comma == self.token.kind || self.token.kind.should_end_const_arg() { + // Find a mistake like `MyTrait<Assoc == S::Assoc>`. + if token::EqEq == snapshot.token.kind { + err.span_suggestion( + snapshot.token.span, + "if you meant to use an associated type binding, replace `==` with `=`", + "=".to_string(), + Applicability::MaybeIncorrect, + ); + let value = self.mk_expr_err(start.to(expr.span)); + err.emit(); + return Ok(GenericArg::Const(AnonConst { id: ast::DUMMY_NODE_ID, value })); + } else if token::Comma == self.token.kind || self.token.kind.should_end_const_arg() + { // Avoid the following output by checking that we consumed a full const arg: // help: expressions must be enclosed in braces to be used as const generic // arguments diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs index 737f1d9cbb1..d8f9fc9179e 100644 --- a/compiler/rustc_parse/src/parser/expr.rs +++ b/compiler/rustc_parse/src/parser/expr.rs @@ -2042,7 +2042,7 @@ impl<'a> Parser<'a> { self.check_for_for_in_in_typo(self.prev_token.span); let expr = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, None)?; - let pat = self.recover_parens_around_for_head(pat, &expr, begin_paren); + let pat = self.recover_parens_around_for_head(pat, begin_paren); let (iattrs, loop_block) = self.parse_inner_attrs_and_block()?; attrs.extend(iattrs); |