tree 9024e9a671af1012c292634d9a8a5af1e37c65c7
parent 1c31032e00bd8ad7ea6f9d9dd89721c77abd82c6
author Damien Neil <dneil@google.com> 1574803644 -0800
committer Damien Neil <dneil@google.com> 1574808978 +0000

reflect/protoreflect: add {Message,List,Map}.IsValid

Various protoreflect methods can return an "empty, read-only" message,
list, or map value. Provide a method to test if a value is one of these.

Fixes golang/protobuf#966

Change-Id: I793d8426d6e2201755983c06f024412a7e09bc4c
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/209018
Reviewed-by: Joe Tsai <joetsai@google.com>