[dev.typeparams] cmd/compile/internal/syntax: add Walk node vistor from types2

This moves the Walk visitor from the types2 to the syntax
package. There are no changes but for package name adjustments.
Preparation for a more full-fledged node visitor.

Change-Id: I95217e27ff943ac58a7638fb8d1cd347d0d554b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/282556
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/cmd/compile/internal/types2/resolver_test.go b/src/cmd/compile/internal/types2/resolver_test.go
index cdfdba6b43..983e8ec4d6 100644
--- a/src/cmd/compile/internal/types2/resolver_test.go
+++ b/src/cmd/compile/internal/types2/resolver_test.go
@@ -144,7 +144,7 @@ func TestResolveIdents(t *testing.T) {
 
 	// check that qualified identifiers are resolved
 	for _, f := range files {
-		Walk(f, func(n syntax.Node) bool {
+		syntax.Walk(f, func(n syntax.Node) bool {
 			if s, ok := n.(*syntax.SelectorExpr); ok {
 				if x, ok := s.X.(*syntax.Name); ok {
 					obj := uses[x]
@@ -172,13 +172,13 @@ func TestResolveIdents(t *testing.T) {
 
 	// Check that each identifier in the source is found in uses or defs or both.
 	// We need the foundUses/Defs maps (rather then just deleting the found objects
-	// from the uses and defs maps) because Walk traverses shared nodes multiple
+	// from the uses and defs maps) because syntax.Walk traverses shared nodes multiple
 	// times (e.g. types in field lists such as "a, b, c int").
 	foundUses := make(map[*syntax.Name]bool)
 	foundDefs := make(map[*syntax.Name]bool)
 	var both []string
 	for _, f := range files {
-		Walk(f, func(n syntax.Node) bool {
+		syntax.Walk(f, func(n syntax.Node) bool {
 			if x, ok := n.(*syntax.Name); ok {
 				var objects int
 				if _, found := uses[x]; found {