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Check for exported fields in embedded structs

This fixes a exported field check condition in a way described at Go
issue https://golang.org/issue/12367

According to the issue comments, this fix should be safe under Go 1.6.

--- a/tpl/template_funcs.go

+++ b/tpl/template_funcs.go

@@ -588,7 +588,7 @@

 	case reflect.Struct:

 		ft, ok := obj.Type().FieldByName(elemName)

 		if ok {

-			if ft.PkgPath != "" {

+			if ft.PkgPath != "" && !ft.Anonymous {

 				return zero, fmt.Errorf("%s is an unexported field of struct type %s", elemName, typ)

 			}

 			return obj.FieldByIndex(ft.Index), nil