Fix unreachable-try-patterns

Author: varkor

src/librustc_codegen_llvm/declare.rs

@@ -23,7 +23,6 @@
 use llvm::{self, ValueRef};
 use llvm::AttributePlace::Function;
 use rustc::ty::{self, Ty};
-use rustc::ty::layout::{self, LayoutOf};
 use rustc::session::config::Sanitizer;
 use rustc_target::spec::PanicStrategy;
 use abi::{Abi, FnType, FnTypeExt};

src/test/compile-fail/unreachable-try-pattern.rs

@@ -17,7 +17,9 @@ enum Void {}
 
 impl From<Void> for i32 {
     fn from(v: Void) -> i32 {
+        //~^ WARN unreachable expression
         match v {}
+        //~^ WARN unreachable expression
     }
 }
 
@@ -39,6 +41,7 @@ fn qux(x: Result<u32, Void>) -> Result<u32, i32> {
 fn vom(x: Result<u32, Void>) -> Result<u32, i32> {
     let y = (match x { Ok(n) => Ok(n), Err(e) => Err(e) })?;
     //~^ WARN unreachable pattern
+    //~| WARN unreachable expression
     Ok(y)
 }