X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc%2Ftraits%2Fon_unimplemented.rs;h=b39c00a56e349ad13c5933b9f6e55c9f69d1b176;hb=f49f38871389041671cc710a044e8360091840a3;hp=5a988d9509e800ee8cb903b36810b8c218c638a3;hpb=0a2e07ec1dc5194e12dfb1ca00c4bc87533ac88d;p=rust.git

diff --git a/src/librustc/traits/on_unimplemented.rs b/src/librustc/traits/on_unimplemented.rs
index 5a988d9509e..b39c00a56e3 100644
--- a/src/librustc/traits/on_unimplemented.rs
+++ b/src/librustc/traits/on_unimplemented.rs
@@ -248,9 +248,11 @@ fn verify(
                     Position::ArgumentNamed(s) if s == sym::from_method => (),
                     // `{from_desugaring}` is allowed
                     Position::ArgumentNamed(s) if s == sym::from_desugaring => (),
+                    // `{ItemContext}` is allowed
+                    Position::ArgumentNamed(s) if s == sym::item_context => (),
                     // So is `{A}` if A is a type parameter
                     Position::ArgumentNamed(s) => match generics.params.iter().find(|param| {
-                        param.name.as_symbol() == s
+                        param.name == s
                     }) {
                         Some(_) => (),
                         None => {
@@ -289,13 +291,14 @@ pub fn format(
                 },
                 GenericParamDefKind::Lifetime => return None
             };
-            let name = param.name.as_symbol();
+            let name = param.name;
             Some((name, value))
         }).collect::<FxHashMap<Symbol, String>>();
         let empty_string = String::new();
 
         let s = self.0.as_str();
         let parser = Parser::new(&s, None, vec![], false);
+        let item_context = (options.get(&sym::item_context)).unwrap_or(&empty_string);
         parser.map(|p|
             match p {
                 Piece::String(s) => s,
@@ -311,6 +314,8 @@ pub fn format(
                             } else if s == sym::from_desugaring || s == sym::from_method {
                                 // don't break messages using these two arguments incorrectly
                                 &empty_string
+                            } else if s == sym::item_context {
+                                &item_context
                             } else {
                                 bug!("broken on_unimplemented {:?} for {:?}: \
                                       no argument matching {:?}",