From dbbe3363c94b120d1eba9cba01dadddd862716b8 Mon Sep 17 00:00:00 2001 From: Mazdak Farrokhzad Date: Tue, 27 Aug 2019 19:51:21 +0200 Subject: Ensure 'let mut ;' where ':pat' is banned. --- src/libsyntax/parse/parser/pat.rs | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/libsyntax/parse/parser') diff --git a/src/libsyntax/parse/parser/pat.rs b/src/libsyntax/parse/parser/pat.rs index 7b228a700a7..08934e85330 100644 --- a/src/libsyntax/parse/parser/pat.rs +++ b/src/libsyntax/parse/parser/pat.rs @@ -384,6 +384,7 @@ impl<'a> Parser<'a> { }) } + /// Parse a mutable binding with the `mut` token already eaten. fn parse_pat_ident_mut(&mut self) -> PResult<'a, PatKind> { let mut_span = self.prev_span; @@ -393,6 +394,14 @@ impl<'a> Parser<'a> { self.recover_additional_muts(); + // Make sure we don't allow e.g. `let mut $p;` where `$p:pat`. + if let token::Interpolated(ref nt) = self.token.kind { + if let token::NtPat(_) = **nt { + self.expected_ident_found().emit(); + } + } + + // Parse the pattern we hope to be an identifier. let mut pat = self.parse_pat(Some("identifier"))?; // Add `mut` to any binding in the parsed pattern. -- cgit 1.4.1-3-g733a5