[release-branch.r59] gc: fix closure bug

««« CL 4709042 / d30305e2898a
gc: fix closure bug

Fixes #2056.

R=rsc
CC=golang-dev
https://golang.org/cl/4709042
»»»

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4814061
3 files changed