syntax: ViewItemUse no longer contains multiple view paths.

it reflected the obsolete syntax `use a, b, c;` and did not make
past the parser (though it was a non-fatal error so we can continue).
this legacy affected many portions of rustc and rustdoc as well,
so this commit cleans them up altogether.

1 files changed, 10 insertions, 12 deletions

diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index c80c4dc3a22..cdae6e663b8 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -407,18 +407,16 @@ impl<'a, O: IdVisitingOperation> Visitor<()> for IdVisitor<'a, O> {
             ViewItemExternCrate(_, _, node_id) => {
                 self.operation.visit_id(node_id)
             }
-            ViewItemUse(ref view_paths) => {
-                for view_path in view_paths.iter() {
-                    match view_path.node {
-                        ViewPathSimple(_, _, node_id) |
-                        ViewPathGlob(_, node_id) => {
-                            self.operation.visit_id(node_id)
-                        }
-                        ViewPathList(_, ref paths, node_id) => {
-                            self.operation.visit_id(node_id);
-                            for path in paths.iter() {
-                                self.operation.visit_id(path.node.id)
-                            }
+            ViewItemUse(ref view_path) => {
+                match view_path.node {
+                    ViewPathSimple(_, _, node_id) |
+                    ViewPathGlob(_, node_id) => {
+                        self.operation.visit_id(node_id)
+                    }
+                    ViewPathList(_, ref paths, node_id) => {
+                        self.operation.visit_id(node_id);
+                        for path in paths.iter() {
+                            self.operation.visit_id(path.node.id)
                         }
                     }
                 }