tree 1a5a89fc1597fc569898653506cf07643db24377
parent c7791ace1f2998b66cc64fca032821e970da2842
author Marcel van Lohuizen <mpvl@golang.org> 1571846705 +0200
committer Marcel van Lohuizen <mpvl@golang.org> 1572008749 +0000

doc/ref/spec.md: write out spec for aliases and optional field sets

This is really to complete the previous CL.
I'll probably merge them before submitting.

Change-Id: If818d60b823bd0a61aa7569b8e19a2daafdbb350
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3821
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>