merge struct similar_name test into the general test file

Author: oli-obk

tests/compile-fail/non_expressive_names.rs

@@ -11,8 +11,15 @@
 //~| NOTE: lint level defined here
 //~| NOTE: lint level defined here
 //~| NOTE: lint level defined here
+//~| NOTE: lint level defined here
 #![allow(unused)]
 
+
+struct Foo {
+    apple: i32,
+    bpple: i32,
+}
+
 fn main() {
     let specter: i32;
     let spectre: i32;
@@ -90,6 +97,13 @@ fn main() {
     let rx_cake: i32;
 }
 
+fn foo() {
+    let Foo { apple, bpple } = unimplemented!();
+    let Foo { apple: spring, //~NOTE existing binding defined here
+        bpple: sprang } = unimplemented!(); //~ ERROR: name is too similar
+    //~^HELP for further information
+}
+
 #[derive(Clone, Debug)]
 enum MaybeInst {
     Split,