cmd/compile/internal/types2: implement TypeList.String (debugging support)

Change-Id: Iaa203def3dac94a7d5ff6120e89315c3d7977ee1
Reviewed-on: https://go-review.googlesource.com/c/go/+/345471
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/types2/typelists.go b/src/cmd/compile/internal/types2/typelists.go
index 3258a5e9f8..c3befb077f 100644
--- a/src/cmd/compile/internal/types2/typelists.go
+++ b/src/cmd/compile/internal/types2/typelists.go
@@ -4,6 +4,8 @@
 
 package types2
 
+import "bytes"
+
 // TParamList holds a list of type parameters.
 type TParamList struct{ tparams []*TypeParam }
 
@@ -52,6 +54,17 @@ func (l *TypeList) list() []Type {
 	return l.types
 }
 
+func (l *TypeList) String() string {
+	if l == nil || len(l.types) == 0 {
+		return "[]"
+	}
+	var buf bytes.Buffer
+	buf.WriteByte('[')
+	writeTypeList(&buf, l.types, nil, nil)
+	buf.WriteByte(']')
+	return buf.String()
+}
+
 // ----------------------------------------------------------------------------
 // Implementation