- minor tweak to composite literal production: renamed PairExpr -> KeyValueExpr and PairExprList -> KeyValueList (to match corresponding nodes in AST per rsc' suggestion)
- minor tweak to composite literal production:
renamed PairExpr -> KeyValueExpr and PairExprList -> KeyValueList
(to match corresponding nodes in AST per rsc' suggestion)

- added a couple of TODOs

R=r,rsc
DELTA=10  (2 added, 0 deleted, 8 changed)
OCL=26837
CL=26840
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go