libgo: update to go1.15rc1

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245157

1 files changed, 32 insertions, 0 deletions

diff --git a/libgo/go/runtime/pprof/label_test.go b/libgo/go/runtime/pprof/label_test.go
index de39d85..fcb00bd 100644
--- a/libgo/go/runtime/pprof/label_test.go
+++ b/libgo/go/runtime/pprof/label_test.go
@@ -80,3 +80,35 @@ func TestContextLabels(t *testing.T) {
 		t.Errorf("(sorted) labels on context: got %v, want %v", gotLabels, wantLabels)
 	}
 }
+
+func TestLabelMapStringer(t *testing.T) {
+	for _, tbl := range []struct {
+		m        labelMap
+		expected string
+	}{
+		{
+			m: labelMap{
+				// empty map
+			},
+			expected: "{}",
+		}, {
+			m: labelMap{
+				"foo": "bar",
+			},
+			expected: `{"foo":"bar"}`,
+		}, {
+			m: labelMap{
+				"foo":             "bar",
+				"key1":            "value1",
+				"key2":            "value2",
+				"key3":            "value3",
+				"key4WithNewline": "\nvalue4",
+			},
+			expected: `{"foo":"bar", "key1":"value1", "key2":"value2", "key3":"value3", "key4WithNewline":"\nvalue4"}`,
+		},
+	} {
+		if got := tbl.m.String(); tbl.expected != got {
+			t.Errorf("%#v.String() = %q; want %q", tbl.m, got, tbl.expected)
+		}
+	}
+}