Auto merge of #35402 - KiChjang:e0206-new-msg, r=GuillaumeGomez

Update E0206 message to new format

Part of #35233.
Fixes #35301.

r? @GuillaumeGomez

Author: bors

src/librustc_typeck/coherence/mod.rs

@@ -330,10 +330,17 @@ impl<'a, 'gcx, 'tcx> CoherenceChecker<'a, 'gcx, 'tcx> {
                            .emit()
                 }
                 Err(CopyImplementationError::NotAnAdt) => {
-                       span_err!(tcx.sess, span, E0206,
-                                 "the trait `Copy` may not be implemented \
-                                  for this type; type is not a structure or \
-                                  enumeration")
+                    let item = tcx.map.expect_item(impl_node_id);
+                    let span = if let ItemImpl(_, _, _, _, ref ty, _) = item.node {
+                        ty.span
+                    } else {
+                        span
+                    };
+
+                    struct_span_err!(tcx.sess, span, E0206,
+                                     "the trait `Copy` may not be implemented for this type")
+                        .span_label(span, &format!("type is not a structure or enumeration"))
+                        .emit();
                 }
                 Err(CopyImplementationError::HasDestructor) => {
                     span_err!(tcx.sess, span, E0184,

src/test/compile-fail/E0206.rs

@@ -10,13 +10,19 @@
 
 type Foo = i32;
 
-impl Copy for Foo { } //~ ERROR E0206
-                      //~^ ERROR E0117
+impl Copy for Foo { }
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
+//~| ERROR only traits defined in the current crate can be implemented for arbitrary types
+//~| NOTE impl doesn't use types inside crate
+//~| NOTE the impl does not reference any types defined in this crate
 
 #[derive(Copy, Clone)]
 struct Bar;
 
-impl Copy for &'static Bar { } //~ ERROR E0206
+impl Copy for &'static Bar { }
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
 
 fn main() {
 }

src/test/compile-fail/coherence-impls-copy.rs

@@ -27,23 +27,34 @@ impl Clone for TestE { fn clone(&self) -> Self { *self } }
 impl Copy for MyType {}
 
 impl Copy for &'static mut MyType {}
-//~^ ERROR E0206
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
 impl Clone for MyType { fn clone(&self) -> Self { *self } }
 
 impl Copy for (MyType, MyType) {}
-//~^ ERROR E0206
-//~| ERROR E0117
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
+//~| ERROR only traits defined in the current crate can be implemented for arbitrary types
+//~| NOTE impl doesn't use types inside crate
+//~| NOTE the impl does not reference any types defined in this crate
 
 impl Copy for &'static NotSync {}
-//~^ ERROR E0206
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
 
 impl Copy for [MyType] {}
-//~^ ERROR E0206
-//~| ERROR E0117
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
+//~| ERROR only traits defined in the current crate can be implemented for arbitrary types
+//~| NOTE impl doesn't use types inside crate
+//~| NOTE the impl does not reference any types defined in this crate
 
 impl Copy for &'static [NotSync] {}
-//~^ ERROR E0206
-//~| ERROR E0117
+//~^ ERROR the trait `Copy` may not be implemented for this type
+//~| NOTE type is not a structure or enumeration
+//~| ERROR only traits defined in the current crate can be implemented for arbitrary types
+//~| NOTE impl doesn't use types inside crate
+//~| NOTE the impl does not reference any types defined in this crate
 
 fn main() {
 }