Fix quoting of ?Sized

Author: sanxiyn

src/libsyntax/ext/quote.rs

@@ -676,9 +676,10 @@ fn expr_mk_token(cx: &ExtCtxt, sp: Span, tok: &token::Token) -> P<ast::Expr> {
         token::FatArrow     => "FatArrow",
         token::Pound        => "Pound",
         token::Dollar       => "Dollar",
+        token::Question     => "Question",
         token::Underscore   => "Underscore",
         token::Eof          => "Eof",
-        _                   => panic!(),
+        _                   => panic!("unhandled token in quote!"),
     };
     mk_token_path(cx, sp, name)
 }

src/test/run-pass-fulldeps/quote-tokens.rs

@@ -43,6 +43,8 @@ fn syntax_extension(cx: &ExtCtxt) {
 
     let _m: Vec<syntax::ast::TokenTree> = quote_matcher!(cx, $($foo:tt,)* bar);
     let _n: syntax::ast::Attribute = quote_attr!(cx, #![cfg(foo, bar = "baz")]);
+
+    let _o: Option<P<syntax::ast::Item>> = quote_item!(cx, fn foo<T: ?Sized>() {});
 }
 
 fn main() {