code review 159800043: goprotobuf: Make text parsing functions return Required...

goprotobuf: Make text parsing functions return RequiredNotSetError as appropriate.

This permits a program to ignore unset required fields when decoding text
just as they can already do when decoding the wire format.
It has the downside of no longer always returning a ParseError unfortunately.

[dsymonds, 2014-10-12 05:38:01]

Hello gmlewis@google.com (cc: golang-codereviews@googlegroups.com),

I'd like you to review this change to
https://code.google.com/p/goprotobuf

[gmlewis1, 2014-10-12 05:42:11]

LGTM

[dsymonds, 2014-10-12 05:42:48]

*** Submitted as
https://code.google.com/p/goprotobuf/source/detail?r=9608ff8e4050 ***

goprotobuf: Make text parsing functions return RequiredNotSetError as
appropriate.

This permits a program to ignore unset required fields when decoding text
just as they can already do when decoding the wire format.
It has the downside of no longer always returning a ParseError unfortunately.

LGTM=gmlewis
R=gmlewis
CC=golang-codereviews
https://codereview.appspot.com/159800043