Delegate `{}` to Default instead of Poly

By using a separate trait this is overridable on a per-type basis and makes room
for the possibility of even more arguments passed in for the future.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/libstd/fmt/parse.rs b/src/libstd/fmt/parse.rs
index 0d39ae84a60..ef8778abf0e 100644
--- a/src/libstd/fmt/parse.rs
+++ b/src/libstd/fmt/parse.rs
@@ -339,7 +339,11 @@ impl<'self> Parser<'self> {
             }
         }
         // Finally the actual format specifier
-        spec.ty = self.word();
+        if self.consume('?') {
+            spec.ty = "?";
+        } else {
+            spec.ty = self.word();
+        }
         return spec;
     }