Remove "tt as expr" macro hack, unneeded since Rust 1.12

Whether increasing the minimum required Rust version is
a SemVer breaking change that should be reflected in
the crate’s version number is arguable.

I chose not to do this here, since 1.12 has been stable for almost two years
(2016-09-29) so I expect the impact to be negligible.

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: rust
 rust:
-  - 1.8.0
+  - 1.12.0
   - nightly
   - beta
   - stable

matches/lib.rs

@@ -30,22 +30,13 @@
 #[macro_export(local_inner_macros)]
 macro_rules! matches {
     ($expression:expr, $($pattern:tt)+) => {
-        _matches_tt_as_expr_hack! {
-            match $expression {
-                $($pattern)+ => true,
-                _ => false
-            }
+        match $expression {
+            $($pattern)+ => true,
+            _ => false
         }
     }
 }
 
-/// Work around "error: unexpected token: `an interpolated tt`", whatever that means.
-#[doc(hidden)]
-#[macro_export(local_inner_macros)]
-macro_rules! _matches_tt_as_expr_hack {
-    ($value:expr) => ($value)
-}
-
 /// Assert that an expression matches a refutable pattern.
 ///
 /// Syntax: `assert_matches!(` *expression* `,` *pattern* `)`
@@ -67,11 +58,9 @@ macro_rules! _matches_tt_as_expr_hack {
 #[macro_export(local_inner_macros)]
 macro_rules! assert_matches {
     ($expression:expr, $($pattern:tt)+) => {
-        _matches_tt_as_expr_hack! {
-            match $expression {
-                $($pattern)+ => (),
-                ref e => panic!("assertion failed: `{:?}` does not match `{}`", e, stringify!($($pattern)+)),
-            }
+        match $expression {
+            $($pattern)+ => (),
+            ref e => panic!("assertion failed: `{:?}` does not match `{}`", e, stringify!($($pattern)+)),
         }
     }
 }