diff options
Diffstat (limited to 'compiler/rustc_parse/src/parser')
| -rw-r--r-- | compiler/rustc_parse/src/parser/item.rs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs index 982f601c0d5..d4f7083c397 100644 --- a/compiler/rustc_parse/src/parser/item.rs +++ b/compiler/rustc_parse/src/parser/item.rs @@ -2492,6 +2492,16 @@ impl<'a> Parser<'a> { pub(super) fn parse_fn_params(&mut self, req_name: ReqName) -> PResult<'a, ThinVec<Param>> { let mut first_param = true; // Parse the arguments, starting out with `self` being allowed... + if self.token.kind != TokenKind::OpenDelim(Delimiter::Parenthesis) + // might be typo'd trait impl, handled elsewhere + && !self.token.is_keyword(kw::For) + { + // recover from missing argument list, e.g. `fn main -> () {}` + self.sess + .emit_err(errors::MissingFnParams { span: self.prev_token.span.shrink_to_hi() }); + return Ok(ThinVec::new()); + } + let (mut params, _) = self.parse_paren_comma_seq(|p| { p.recover_diff_marker(); let param = p.parse_param_general(req_name, first_param).or_else(|mut e| { |