closes #9: Fixed parsing null as a struct.

gen/decoder.go

@@ -214,6 +214,10 @@ func (g *Generator) genStructDecoder(t reflect.Type) error {
 	typ := g.getType(t)
 
 	fmt.Fprintln(g.out, "func "+fname+"(in *jlexer.Lexer, out *"+typ+") {")
+	fmt.Fprintln(g.out, "  if in.IsNull() {")
+	fmt.Fprintln(g.out, "    in.Skip()")
+	fmt.Fprintln(g.out, "    return")
+	fmt.Fprintln(g.out, "  }")
 
 	// Init embedded pointer fields.
 	for i := 0; i < t.NumField(); i++ {

tests/basic_test.go

@@ -91,3 +91,14 @@ func TestRawMessageSTD(t *testing.T) {
 		t.Errorf("json.Unmarshal() = %v; want %v", gotV, wantV)
 	}
 }
+
+func TestParseNull(t *testing.T) {
+	var got, want SubStruct
+	if err := easyjson.Unmarshal([]byte("null"), &got); err != nil {
+		t.Errorf("Unmarshal() error: %v", err)
+	}
+
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("Unmarshal() = %+v; want %+v", got, want)
+	}
+}