tree 94a73a2ff287611ca86e0580b51085e72eaab0b0
parent a1c6abc90644e4ba22d4fae4e973cd52d4408822
author Damien Neil <dneil@google.com> 1536790540 -0700
committer Damien Neil <dneil@google.com> 1536862400 +0000

reflect/prototype: add HasDefault to FieldDescriptor

Provide a way to distinguish between a field with a zero-value
default and one with no default.

Change-Id: I4b1231de2d1bb141099cb1a415b35184dd198f93
Reviewed-on: https://go-review.googlesource.com/135255
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>