From f86615299190b77fd5890ee3951ed85e36d829df Mon Sep 17 00:00:00 2001
From: Matt Ickstadt <mattico8@gmail.com>
Date: Sat, 26 Aug 2017 17:09:31 -0500
Subject: Implement RFC 1925

---
 src/libsyntax/parse/parser.rs | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/libsyntax/parse')

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index d08373334f1..1f033b25fe4 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -3155,6 +3155,12 @@ impl<'a> Parser<'a> {
         maybe_whole!(self, NtArm, |x| x);
 
         let attrs = self.parse_outer_attributes()?;
+        // Allow a '|' before the pats (RFC 1925)
+        let beginning_vert = if self.eat(&token::BinOp(token::Or)) {
+            Some(self.prev_span)
+        } else {
+            None
+        };
         let pats = self.parse_pats()?;
         let guard = if self.eat_keyword(keywords::If) {
             Some(self.parse_expr()?)
@@ -3178,6 +3184,7 @@ impl<'a> Parser<'a> {
             pats,
             guard,
             body: expr,
+            beginning_vert,
         })
     }
 
-- 
cgit 1.4.1-3-g733a5