Allow #[rustc_builtin_macro = "name"].

This makes it possible to have both std::panic and core::panic as a
builtin macro, by using different builtin macro names for each.

Also removes SyntaxExtension::is_derive_copy, as the macro name (e.g.
sym::Copy) is now tracked and provides that information directly.

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/rustc_resolve/src/macros.rs b/compiler/rustc_resolve/src/macros.rs
index e6360cccf3b..60a1fc88631 100644
--- a/compiler/rustc_resolve/src/macros.rs
+++ b/compiler/rustc_resolve/src/macros.rs
@@ -285,7 +285,7 @@ impl<'a> ResolverExpand for Resolver<'a> {
                                 helper_attrs.extend(
                                     ext.helper_attrs.iter().map(|name| Ident::new(*name, span)),
                                 );
-                                if ext.is_derive_copy {
+                                if ext.builtin_name == Some(sym::Copy) {
                                     self.containers_deriving_copy.insert(invoc_id);
                                 }
                                 ext
@@ -1089,9 +1089,9 @@ impl<'a> Resolver<'a> {
             edition,
         );
 
-        if result.is_builtin {
+        if let Some(builtin_name) = result.builtin_name {
             // The macro was marked with `#[rustc_builtin_macro]`.
-            if let Some(builtin_macro) = self.builtin_macros.get_mut(&item.ident.name) {
+            if let Some(builtin_macro) = self.builtin_macros.get_mut(&builtin_name) {
                 // The macro is a built-in, replace its expander function
                 // while still taking everything else from the source code.
                 // If we already loaded this builtin macro, give a better error message than 'no such builtin macro'.