rustc: Move walk_pat to ast_util

This will allow ast_map to move to the syntax crate

1 files changed, 12 insertions, 0 deletions

diff --git a/src/librustsyntax/ast_util.rs b/src/librustsyntax/ast_util.rs
index 2f0e4447352..211414ac7d4 100644
--- a/src/librustsyntax/ast_util.rs
+++ b/src/librustsyntax/ast_util.rs
@@ -530,6 +530,18 @@ pure fn is_item_impl(item: @ast::item) -> bool {
     }
 }
 
+fn walk_pat(pat: @pat, it: fn(@pat)) {
+    it(pat);
+    alt pat.node {
+      pat_ident(pth, some(p)) { walk_pat(p, it); }
+      pat_rec(fields, _) { for fields.each {|f| walk_pat(f.pat, it); } }
+      pat_enum(_, some(s)) | pat_tup(s) { for s.each {|p| walk_pat(p, it); } }
+      pat_box(s) | pat_uniq(s) { walk_pat(s, it); }
+      pat_wild | pat_lit(_) | pat_range(_, _) | pat_ident(_, _)
+        | pat_enum(_, _) {}
+    }
+}
+
 // Local Variables:
 // mode: rust
 // fill-column: 78;