From 0dfd9c30f2c61458343e0816c66f448019e826d1 Mon Sep 17 00:00:00 2001
From: Alex Burka <alex@alexburka.com>
Date: Sat, 24 Jun 2017 18:26:04 +0000
Subject: syntax: allow negative integer literal expression to be interpolated
 as pattern

---
 src/libsyntax/parse/parser.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/libsyntax/parse')

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 851a638e148..5b0031b2f17 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1659,8 +1659,10 @@ impl<'a> Parser<'a> {
         Ok(codemap::Spanned { node: lit, span: lo.to(self.prev_span) })
     }
 
-    /// matches '-' lit | lit
+    /// matches '-' lit | lit (cf. ast_validation::AstValidator::check_expr_within_pat)
     pub fn parse_pat_literal_maybe_minus(&mut self) -> PResult<'a, P<Expr>> {
+        maybe_whole_expr!(self);
+
         let minus_lo = self.span;
         let minus_present = self.eat(&token::BinOp(token::Minus));
         let lo = self.span;
-- 
cgit 1.4.1-3-g733a5