remove unused imports and feature gate from tests

Author: Dylan-DPC

src/libsyntax/config.rs

@@ -5,7 +5,6 @@ use feature_gate::{
     Features,
     get_features,
     GateIssue,
-    emit_feature_err,
 };
 use {fold, attr};
 use ast;
@@ -94,8 +93,6 @@ impl<'a> StripUnconfigured<'a> {
             return vec![attr];
         }
 
-        let cfg_attr_span = attr.span;
-
         let (cfg_predicate, expanded_attrs) = match attr.parse(self.sess, |parser| {
             parser.expect(&token::OpenDelim(token::Paren))?;
 

src/test/ui/conditional-compilation/cfg-attr-multi-false.rs

@@ -4,7 +4,6 @@
 // compile-pass
 
 #![warn(unused_must_use)]
-#![cfg_attr(stage0, feature(cfg_attr_multi))]
 
 #[cfg_attr(any(), deprecated, must_use)]
 struct Struct {}

src/test/ui/conditional-compilation/cfg-attr-multi-true.rs

@@ -5,7 +5,6 @@
 // compile-pass
 
 #![warn(unused_must_use)]
-#![cfg_attr(stage0, feature(cfg_attr_multi))]
 
 #[cfg_attr(all(), deprecated, must_use)]
 struct MustUseDeprecated {}

src/test/ui/conditional-compilation/cfg-attr-multi-true.stderr

@@ -1,31 +1,31 @@
 warning: use of deprecated item 'MustUseDeprecated'
-  --> $DIR/cfg-attr-multi-true.rs:13:6
+  --> $DIR/cfg-attr-multi-true.rs:12:6
    |
 LL | impl MustUseDeprecated { //~ warning: use of deprecated item
    |      ^^^^^^^^^^^^^^^^^
    |
    = note: #[warn(deprecated)] on by default
 
 warning: use of deprecated item 'MustUseDeprecated'
-  --> $DIR/cfg-attr-multi-true.rs:20:5
+  --> $DIR/cfg-attr-multi-true.rs:19:5
    |
 LL |     MustUseDeprecated::new(); //~ warning: use of deprecated item
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of deprecated item 'MustUseDeprecated'
-  --> $DIR/cfg-attr-multi-true.rs:14:17
+  --> $DIR/cfg-attr-multi-true.rs:13:17
    |
 LL |     fn new() -> MustUseDeprecated { //~ warning: use of deprecated item
    |                 ^^^^^^^^^^^^^^^^^
 
 warning: use of deprecated item 'MustUseDeprecated'
-  --> $DIR/cfg-attr-multi-true.rs:15:9
+  --> $DIR/cfg-attr-multi-true.rs:14:9
    |
 LL |         MustUseDeprecated {} //~ warning: use of deprecated item
    |         ^^^^^^^^^^^^^^^^^
 
 warning: unused `MustUseDeprecated` that must be used
-  --> $DIR/cfg-attr-multi-true.rs:20:5
+  --> $DIR/cfg-attr-multi-true.rs:19:5
    |
 LL |     MustUseDeprecated::new(); //~ warning: use of deprecated item
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^