feat: optimize logx print error (#3649)

core/logx/writer_test.go

@@ -129,6 +129,15 @@ func TestWriteJson(t *testing.T) {
 	buf.Reset()
 	writeJson(nil, make(chan int))
 	assert.Contains(t, buf.String(), "unsupported type")
+
+	buf.Reset()
+	type C struct {
+		RC func()
+	}
+	writeJson(nil, C{
+		RC: func() {},
+	})
+	assert.Contains(t, buf.String(), "runtime/debug.Stack")
 }
 
 func TestWritePlainAny(t *testing.T) {
@@ -165,6 +174,14 @@ func TestWritePlainAny(t *testing.T) {
 	writePlainAny(hardToWriteWriter{}, levelFatal, "foo")
 	assert.Contains(t, buf.String(), "write error")
 
+	buf.Reset()
+	type C struct {
+		RC func()
+	}
+	writePlainAny(nil, levelError, C{
+		RC: func() {},
+	})
+	assert.Contains(t, buf.String(), "runtime/debug.Stack")
 }
 
 func TestLogWithLimitContentLength(t *testing.T) {