rustc: Remove unused slice call from extfmt. Closes #532

Author: brson

src/comp/front/extfmt.rs

@@ -29,8 +29,6 @@ fn expand_syntax_ext(&ext_ctxt cx, common::span sp, &vec[@ast::expr] args,
     }
     auto parse_fmt_err = bind parse_fmt_err_(cx, fmtspan, _);
     auto pieces = parse_fmt_string(fmt, parse_fmt_err);
-    auto args_len = vec::len[@ast::expr](args);
-    auto fmt_args = vec::slice[@ast::expr](args, 1u, args_len - 1u);
     ret pieces_to_expr(cx, sp, pieces, args);
 }
 

src/test/run-pass/syntax-extension-fmt.rs

@@ -11,6 +11,9 @@ fn test(str actual, str expected) {
 fn main() {
     test(#fmt("hello %d friends and %s things", 10, "formatted"),
          "hello 10 friends and formatted things");
+
+    test(#fmt("test"), "test");
+
     // Simple tests for types
 
     test(#fmt("%d", 1), "1");