From ae067477fbc08e5998756d36b6ab0b82173e5c74 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Fri, 20 Jun 2014 10:49:54 -0700
Subject: libsyntax: Stop parsing `+` with no bounds after it.

This will break code that looks like `Box<Trait+>`. Change that code to
`Box<Trait>` instead.

Closes #14925.

[breaking-change]
---
 src/libsyntax/parse/parser.rs | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/libsyntax/parse')

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index ae2ec216bee..158a8c5a116 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1646,6 +1646,12 @@ impl<'a> Parser<'a> {
             let bounds = {
                 if self.eat(&token::BINOP(token::PLUS)) {
                     let (_, bounds) = self.parse_ty_param_bounds(false);
+                    if bounds.len() == 0 {
+                        let last_span = self.last_span;
+                        self.span_err(last_span,
+                                      "at least one type parameter bound \
+                                       must be specified after the `+`");
+                    }
                     Some(bounds)
                 } else {
                     None
-- 
cgit 1.4.1-3-g733a5