Show span for trait that doesn't implement Copy

Change error message to

```nocode
error[E0205]: the trait `Copy` may not be implemented for type `Foo`
  --> $DIR/issue-19950.rs:17:6
   |
14 |     MyVariant(NoCopy)
   |     ----------------- this variant doesn't implement `Copy`
...
17 | impl Copy for Foo {}
   |      ^^^^ variant `Foo::MyVariant` doesn't implement `Copy`

error[E0204]: the trait `Copy` may not be implemented for type `Bar`
  --> $DIR/issue-19950.rs:23:1
   |
20 |     item: NoCopy,
   |     ------------ this field doesn't implement `Copy`
...
23 | impl Copy for Bar {}
   | ^^^^^^^^^^^^^^^^^^^^ field `item` in struct `Bar` doesn't implement `Copy`
```

src/librustc/hir/map/collector.rs

@@ -26,7 +26,7 @@ pub struct NodeCollector<'ast> {
     /// If true, completely ignore nested items. We set this when loading
     /// HIR from metadata, since in that case we only want the HIR for
     /// one specific item (and not the ones nested inside of it).
-    pub ignore_nested_items: bool
+    pub ignore_nested_items: bool,
 }
 
 impl<'ast> NodeCollector<'ast> {
@@ -35,7 +35,7 @@ impl<'ast> NodeCollector<'ast> {
             krate: krate,
             map: vec![],
             parent_node: CRATE_NODE_ID,
-            ignore_nested_items: false
+            ignore_nested_items: false,
         };
         collector.insert_entry(CRATE_NODE_ID, RootCrate);
 
@@ -51,7 +51,7 @@ impl<'ast> NodeCollector<'ast> {
             krate: krate,
             map: map,
             parent_node: parent_node,
-            ignore_nested_items: true
+            ignore_nested_items: true,
         };
 
         collector.insert_entry(parent_node, RootInlinedParent(parent));

src/librustc/hir/map/definitions.rs

@@ -18,6 +18,7 @@ use hir::def_id::{CrateNum, DefId, DefIndex, LOCAL_CRATE};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::StableHasher;
 use serialize::{Encodable, Decodable, Encoder, Decoder};
+use std::fmt;
 use std::fmt::Write;
 use std::hash::{Hash, Hasher};
 use syntax::ast;
@@ -220,6 +221,18 @@ impl DefPath {
     }
 }
 
+impl fmt::Display for DefPath {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        for (i, component) in self.data.iter().enumerate() {
+            write!(f,
+                   "{}{}",
+                   if i == 0 { "" } else {"::"},
+                   component.data.as_interned_str())?;
+        }
+        Ok(())
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
 pub enum DefPathData {
     // Root: these should only be used for the root nodes, because

src/librustc/ty/util.rs

@@ -115,8 +115,8 @@ impl IntTypeExt for attr::IntType {
 
 #[derive(Copy, Clone)]
 pub enum CopyImplementationError {
-    InfrigingField(Name),
-    InfrigingVariant(Name),
+    InfrigingField(DefId, Name),
+    InfrigingVariant(DefId, Name),
     NotAnAdt,
     HasDestructor
 }
@@ -149,7 +149,7 @@ impl<'tcx> ParameterEnvironment<'tcx> {
                             let field_ty = field.ty(tcx, substs);
                             if infcx.type_moves_by_default(field_ty, span) {
                                 return Err(CopyImplementationError::InfrigingField(
-                                    field.name))
+                                    field.did, field.name))
                             }
                         }
                         adt
@@ -160,7 +160,7 @@ impl<'tcx> ParameterEnvironment<'tcx> {
                                 let field_ty = field.ty(tcx, substs);
                                 if infcx.type_moves_by_default(field_ty, span) {
                                     return Err(CopyImplementationError::InfrigingVariant(
-                                        variant.name))
+                                        variant.did, variant.name))
                                 }
                             }
                         }

src/librustc_typeck/coherence/mod.rs

@@ -253,29 +253,43 @@ impl<'a, 'gcx, 'tcx> CoherenceChecker<'a, 'gcx, 'tcx> {
 
             match param_env.can_type_implement_copy(tcx, self_type, span) {
                 Ok(()) => {}
-                Err(CopyImplementationError::InfrigingField(name)) => {
-                    struct_span_err!(tcx.sess,
-                                     span,
-                                     E0204,
-                                     "the trait `Copy` may not be implemented for this type")
-                        .span_label(span, &format!("field `{}` does not implement `Copy`", name))
-                        .emit()
+                Err(CopyImplementationError::InfrigingField(did, name)) => {
+                    let mut err = struct_span_err!(tcx.sess,
+                                                   span,
+                                                   E0204,
+                                                   "the trait `Copy` may not be implemented for \
+                                                   type `{}`",
+                                                   self_type);
+                    err.span_label(span,
+                                   &format!("field `{}` doesn't implement `Copy`",
+                                            name));
+                    if let Some(def_span) = tcx.map.span_if_local(did) {
+                        err.span_label(def_span, &"this field doesn't implement `Copy`");
+                    }
+                    err.emit()
                 }
-                Err(CopyImplementationError::InfrigingVariant(name)) => {
+                Err(CopyImplementationError::InfrigingVariant(did, _)) => {
                     let item = tcx.map.expect_item(impl_node_id);
+                    let item_def_path = tcx.map.def_path(did);
                     let span = if let ItemImpl(.., Some(ref tr), _, _) = item.node {
                         tr.path.span
                     } else {
                         span
                     };
 
-                    struct_span_err!(tcx.sess,
-                                     span,
-                                     E0205,
-                                     "the trait `Copy` may not be implemented for this type")
-                        .span_label(span,
-                                    &format!("variant `{}` does not implement `Copy`", name))
-                        .emit()
+                    let mut err = struct_span_err!(tcx.sess,
+                                                   span,
+                                                   E0205,
+                                                   "the trait `Copy` may not be implemented for \
+                                                   type `{}`",
+                                                   self_type);
+                    err.span_label(span,
+                                   &format!("variant `{}` doesn't implement `Copy`",
+                                            item_def_path));
+                    if let Some(def_span) = tcx.map.span_if_local(did) {
+                        err.span_label(def_span, &"this variant doesn't implement `Copy`");
+                    }
+                    err.emit()
                 }
                 Err(CopyImplementationError::NotAnAdt) => {
                     let item = tcx.map.expect_item(impl_node_id);

src/test/compile-fail/E0204.rs

@@ -10,18 +10,20 @@
 
 struct Foo {
     foo: Vec<u32>,
+    //~^ this field doesn't implement `Copy`
 }
 
 impl Copy for Foo { }
 //~^ ERROR E0204
-//~| NOTE field `foo` does not implement `Copy`
+//~| NOTE field `foo` doesn't implement `Copy`
 
 #[derive(Copy)]
 //~^ ERROR E0204
-//~| NOTE field `ty` does not implement `Copy`
+//~| NOTE field `ty` doesn't implement `Copy`
 //~| NOTE in this expansion of #[derive(Copy)]
 struct Foo2<'a> {
     ty: &'a mut bool,
+    //~^ this field doesn't implement `Copy`
 }
 
 fn main() {

src/test/compile-fail/E0205.rs

@@ -10,19 +10,21 @@
 
 enum Foo {
     Bar(Vec<u32>),
+    //~^ NOTE this variant doesn't implement `Copy`
     Baz,
 }
 
 impl Copy for Foo { }
-//~^ ERROR the trait `Copy` may not be implemented for this type
-//~| NOTE variant `Bar` does not implement `Copy`
+//~^ ERROR the trait `Copy` may not be implemented for type `Foo`
+//~| NOTE variant `Foo::Bar` doesn't implement `Copy`
 
 #[derive(Copy)]
-//~^ ERROR the trait `Copy` may not be implemented for this type
-//~| NOTE variant `Bar` does not implement `Copy`
+//~^ ERROR the trait `Copy` may not be implemented for type `Foo2<'a>`
+//~| NOTE variant `Foo2::Bar` doesn't implement `Copy`
 //~| NOTE in this expansion of #[derive(Copy)]
 enum Foo2<'a> {
     Bar(&'a mut bool),
+    //~^ NOTE this variant doesn't implement `Copy`
     Baz,
 }
 

src/test/compile-fail/issue-27340.rs

@@ -10,7 +10,7 @@
 
 struct Foo;
 #[derive(Copy, Clone)]
-//~^ ERROR the trait `Copy` may not be implemented for this type
+//~^ ERROR the trait `Copy` may not be implemented for type `Bar`
 struct Bar(Foo);
 
 fn main() {}

src/test/compile-fail/opt-in-copy.rs

@@ -15,7 +15,7 @@ struct IWantToCopyThis {
 }
 
 impl Copy for IWantToCopyThis {}
-//~^ ERROR the trait `Copy` may not be implemented for this type
+//~^ ERROR the trait `Copy` may not be implemented for type `IWantToCopyThis`
 
 enum CantCopyThisEither {
     A,
@@ -27,6 +27,6 @@ enum IWantToCopyThisToo {
 }
 
 impl Copy for IWantToCopyThisToo {}
-//~^ ERROR the trait `Copy` may not be implemented for this type
+//~^ ERROR the trait `Copy` may not be implemented for type `IWantToCopyThisToo`
 
 fn main() {}

src/test/compile-fail/union/union-copy.rs

@@ -21,6 +21,6 @@ union W {
 }
 
 impl Copy for U {} // OK
-impl Copy for W {} //~ ERROR the trait `Copy` may not be implemented for this type
+impl Copy for W {} //~ ERROR the trait `Copy` may not be implemented for type `W`
 
 fn main() {}

src/test/ui/span/issue-19950-1.rs

@@ -0,0 +1,19 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct NoCopy;
+
+struct Bar {
+    item: NoCopy,
+}
+
+impl Copy for Bar {}
+
+fn main() {}

src/test/ui/span/issue-19950-1.stderr

@@ -0,0 +1,11 @@
+error[E0204]: the trait `Copy` may not be implemented for type `Bar`
+  --> $DIR/issue-19950-1.rs:17:1
+   |
+14 |     item: NoCopy,
+   |     ------------ this field doesn't implement `Copy`
+...
+17 | impl Copy for Bar {}
+   | ^^^^^^^^^^^^^^^^^^^^ field `item` doesn't implement `Copy`
+
+error: aborting due to previous error
+

src/test/ui/span/issue-19950-2.rs

@@ -0,0 +1,19 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct NoCopy;
+
+enum Foo {
+    MyVariant(NoCopy)
+}
+
+impl Copy for Foo {}
+
+fn main() {}

src/test/ui/span/issue-19950-2.stderr

@@ -0,0 +1,11 @@
+error[E0205]: the trait `Copy` may not be implemented for type `Foo`
+  --> $DIR/issue-19950-2.rs:17:6
+   |
+14 |     MyVariant(NoCopy)
+   |     ----------------- this variant doesn't implement `Copy`
+...
+17 | impl Copy for Foo {}
+   |      ^^^^ variant `Foo::MyVariant` doesn't implement `Copy`
+
+error: aborting due to previous error
+