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cmd/compile: race detector detects race with close(chan) and len(chan) [1.11 backport] #27778
Considering backporting the fix for #27070 to 1.11.
This was an issue introduced in 1.11. The race detector reported a race between close(chan) and len(chan), where previously (in 1.10) it didn't.
The spec is silent on this issue, so it's technically ok to report a race here, but consensus was that it was worth fixing. But is it worth backporting?