Fix panic for private fields which cannot Interface

internal/test.go

@@ -0,0 +1,21 @@
+package internal
+
+import (
+	"time"
+)
+
+type StructA struct {
+	String1 string
+	string2 string
+	Time1   time.Time
+	time2   time.Time
+}
+
+func MakeStructA(s string, t time.Time) StructA {
+	return StructA{
+		String1: s,
+		string2: s + "2",
+		Time1:   t,
+		time2:   t.Add(2 * time.Hour),
+	}
+}

repr.go

@@ -233,33 +233,39 @@ func (p *Printer) reprValue(seen map[reflect.Value]bool, v reflect.Value, indent
 		fmt.Fprintf(p.w, "%s}", in)
 
 	case reflect.Struct:
-		if td, ok := v.Interface().(time.Time); ok {
-			timeToGo(p.w, td)
-		} else {
-			if showType {
-				fmt.Fprintf(p.w, "%s{", v.Type())
-			} else {
-				fmt.Fprint(p.w, "{")
+
+		if v.CanInterface() {
+			switch tv := v.Interface().(type) {
+			case time.Time:
+				timeToGo(p.w, tv)
+				return
 			}
-			if p.indent != "" && v.NumField() != 0 {
-				fmt.Fprintf(p.w, "\n")
+		}
+
+		if showType {
+			fmt.Fprintf(p.w, "%s{", v.Type())
+		} else {
+			fmt.Fprint(p.w, "{")
+		}
+		if p.indent != "" && v.NumField() != 0 {
+			fmt.Fprintf(p.w, "\n")
+		}
+		for i := 0; i < v.NumField(); i++ {
+			t := v.Type().Field(i)
+			f := v.Field(i)
+			if p.omitEmpty && isZero(f) {
+				continue
 			}
-			for i := 0; i < v.NumField(); i++ {
-				t := v.Type().Field(i)
-				f := v.Field(i)
-				if p.omitEmpty && isZero(f) {
-					continue
-				}
-				fmt.Fprintf(p.w, "%s%s: ", ni, t.Name)
-				p.reprValue(seen, f, ni, true)
-				if p.indent != "" {
-					fmt.Fprintf(p.w, ",\n")
-				} else if i < v.NumField()-1 {
-					fmt.Fprintf(p.w, ", ")
-				}
+			fmt.Fprintf(p.w, "%s%s: ", ni, t.Name)
+			p.reprValue(seen, f, ni, true)
+			if p.indent != "" {
+				fmt.Fprintf(p.w, ",\n")
+			} else if i < v.NumField()-2 {
+				fmt.Fprintf(p.w, ", ")
 			}
-			fmt.Fprintf(p.w, "%s}", indent)
 		}
+		fmt.Fprintf(p.w, "%s}", indent)
+
 	case reflect.Ptr:
 		if v.IsNil() {
 			fmt.Fprintf(p.w, "nil")

repr_test.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/alecthomas/repr/internal"
 )
 
 func equal(t *testing.T, want, have string) {
@@ -185,7 +187,7 @@ func TestRecursiveIssue3(t *testing.T) {
 	child := &data{}
 	root := &data{children: []*data{child}}
 	child.parent = root
-	want := "&repr.data{children: []*repr.data{{parent: &..., }}}"
+	want := "&repr.data{children: []*repr.data{{parent: &...}}}"
 	have := String(root)
 	equal(t, want, have)
 }
@@ -209,3 +211,10 @@ func TestReprPrivateBytes(t *testing.T) {
 		equal(t, "repr.MyBuffer{buf: &bytes.Buffer{buf: []byte(\"Hi th3re!\"), }}", s)
 	}
 }
+
+func TestReprInternalTime(t *testing.T) {
+	obj := internal.MakeStructA("s", time.Date(2020, 12, 1, 10, 13, 45, 0, time.UTC))
+	s := String(obj)
+
+	equal(t, "internal.StructA{String1: \"s\", string2: \"s2\", Time1: time.Date(2020, 12, 1, 10, 13, 45, 0, time.UTC)time2: time.Time{ext: 63742421625}}", s)
+}