Use full paths in proc-macro.

Author: cjgillot

compiler/rustc_macros/src/visitable.rs

@@ -47,7 +47,7 @@ pub(super) fn visitable_derive(mut s: synstructure::Structure<'_>) -> proc_macro
         if has_attr(bind, "ignore") {
             quote! {}
         } else {
-            quote! { try_visit!(Visitable::visit(#bind, __visitor, (#extra))) }
+            quote! { rustc_ast_ir::try_visit!(crate::visit::Visitable::visit(#bind, __visitor, (#extra))) }
         }
     });
 
@@ -57,24 +57,23 @@ pub(super) fn visitable_derive(mut s: synstructure::Structure<'_>) -> proc_macro
         if has_attr(bind, "ignore") {
             quote! {}
         } else {
-            quote! { MutVisitable::visit_mut(#bind, __visitor, (#extra)) }
+            quote! { crate::mut_visit::MutVisitable::visit_mut(#bind, __visitor, (#extra)) }
         }
     });
 
     s.gen_impl(quote! {
-        use rustc_ast_ir::try_visit;
-        use rustc_ast_ir::visit::VisitorResult;
-        use crate::visit::{Visitable, Visitor, Walkable};
-        use crate::mut_visit::{MutVisitor, MutVisitable, MutWalkable};
-
-        gen impl<'__ast, __V: Visitor<'__ast>> Walkable<'__ast, __V> for @Self {
+        gen impl<'__ast, __V> crate::visit::Walkable<'__ast, __V> for @Self
+            where __V: crate::visit::Visitor<'__ast>,
+        {
             fn walk_ref(&'__ast self, __visitor: &mut __V) -> __V::Result {
                 match *self { #ref_visit }
-                <__V::Result as VisitorResult>::output()
+                <__V::Result as rustc_ast_ir::visit::VisitorResult>::output()
             }
         }
 
-        gen impl<__V: MutVisitor> MutWalkable<__V> for @Self {
+        gen impl<__V> crate::mut_visit::MutWalkable<__V> for @Self
+            where __V: crate::mut_visit::MutVisitor,
+        {
             fn walk_mut(&mut self, __visitor: &mut __V) {
                 match *self { #mut_visit }
             }