undo CL 4428057 / 19e540fc7d7d
undo CL 4428057 / 19e540fc7d7d

The CL introduces inconsistencies with respect to
the use of parentheses/grouping of receive operations.

««« original CL description
spec: narrow syntax for expression and select statements

This is not a language change, it simply expresses the
accepted cases explicitly in the respective productions.

R=rsc, r, iant
CC=golang-dev
http://codereview.appspot.com/4428057
»»»

R=golang-dev, rsc1
CC=golang-dev
http://codereview.appspot.com/4444080

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