[dev.typealias] cmd/compile: recognize type aliases but complain for now (not yet supported)

Added test file.

For #18130.

Change-Id: Ifcfd7cd1acf9dd6a2f4f3d85979d232bb6b8c6b1
Reviewed-on: https://go-review.googlesource.com/34988
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/syntax/printer_test.go b/src/cmd/compile/internal/syntax/printer_test.go
index 5c0fc776a1..a9969e610a 100644
--- a/src/cmd/compile/internal/syntax/printer_test.go
+++ b/src/cmd/compile/internal/syntax/printer_test.go
@@ -22,3 +22,20 @@ func TestPrint(t *testing.T) {
 	Fprint(os.Stdout, ast, true)
 	fmt.Println()
 }
+
+func TestPrintString(t *testing.T) {
+	for _, want := range []string{
+		"package p",
+		"package p; type _ = int; type T1 = struct{}; type ( _ = *struct{}; T2 = float32 )",
+		// TODO(gri) expand
+	} {
+		ast, err := ParseBytes([]byte(want), nil, nil, 0)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if got := String(ast); got != want {
+			t.Errorf("%q: got %q", want, got)
+		}
+	}
+}