assert: guard CanConvert call in backward compatible wrapper

assert/assertion_compare.go

@@ -306,7 +306,7 @@ func compare(obj1, obj2 interface{}, kind reflect.Kind) (CompareType, bool) {
 	case reflect.Struct:
 		{
 			// All structs enter here. We're not interested in most types.
-			if !obj1Value.CanConvert(timeType) {
+			if !canConvert(obj1Value, timeType) {
 				break
 			}
 

assert/assertion_compare_can_convert.go

@@ -0,0 +1,11 @@
+// +build go1.17
+
+package assert
+
+import "reflect"
+
+// Wrapper around reflect.Value.CanConvert, for compatability
+// reasons.
+func canConvert(value reflect.Value, to reflect.Type) bool {
+	return value.CanConvert(to)
+}

assert/assertion_compare_legacy.go

@@ -0,0 +1,11 @@
+// +build !go1.17
+
+package assert
+
+import "reflect"
+
+// Older versions of Go does not have the reflect.Value.CanConvert
+// method.
+func canConvert(value reflect.Value, to reflect.Type) bool {
+	return false
+}