Fix some clippy warnings

Author: oli-obk

src/eval_context.rs

@@ -1680,12 +1680,12 @@ pub fn eval_main<'a, 'tcx: 'a>(
             }
         }
         Err(e) => {
-            report(tcx, &ecx, e);
+            report(tcx, &ecx, &e);
         }
     }
 }
 
-fn report(tcx: TyCtxt, ecx: &EvalContext, e: EvalError) {
+fn report(tcx: TyCtxt, ecx: &EvalContext, e: &EvalError) {
     if let Some(frame) = ecx.stack().last() {
         let block = &frame.mir.basic_blocks()[frame.block];
         let span = if frame.stmt < block.statements.len() {

tests/run-pass/union.rs

@@ -62,7 +62,7 @@ fn c() {
         unsafe {
             match v {
                 Value { tag: Tag::I, u: U { i: 0 } } => true,
-                Value { tag: Tag::F, u: U { f } } if f == 0.0 => true,
+                Value { tag: Tag::F, u: U { f } } => f == 0.0,
                 _ => false,
             }
         }