Merge pull request #413 from philipc/cleanup

Fix various warnings

.travis.yml

@@ -12,6 +12,7 @@ os:
 osx_image: xcode7.1
 
 rust:
+- 1.32.0
 - nightly
 - beta
 - stable

README.md

@@ -33,6 +33,8 @@ Add this to your `Cargo.toml`:
 gimli = "0.17.0"
 ```
 
+The minimum supported rust version is 1.32.0.
+
 ## Documentation
 
 * [Documentation on docs.rs](https://docs.rs/gimli/)

src/arch.rs

@@ -1,7 +1,7 @@
 use crate::common::Register;
 
 macro_rules! registers {
-    ($struct_name:ident, { $($name:ident = ($val:expr, $disp:expr)),+ }) => {
+    ($struct_name:ident, { $($name:ident = ($val:expr, $disp:expr)),+ $(,)? }) => {
         #[allow(missing_docs)]
         impl $struct_name {
             $(
@@ -21,10 +21,6 @@ macro_rules! registers {
             }
         }
     };
-    // Handle trailing comma
-    ($struct_name:ident, { $($name:ident = ($val:expr, $disp:expr)),+, }) => {
-        registers!($struct_name, { $($name = ($val, $disp)),+ });
-    };
 }
 
 /// ARM architecture specific definitions.