cmd/compile: could not import "package" (cannot import "package" (type parameter bound more than once), possibly version skew - reinstall package) [1.18 backport]

[gopherbot]

@ianlancetaylor requested issue #51836 to be considered for backport to the next 1.18 minor release.

@gopherbot Please open backport to 1.18

This seems to be a compiler error on valid code.

[gopherbot]

Change https://go.dev/cl/394854 mentions this issue: cmd/compile/internal/importer: key tparams by Package instead of pkgname

[toothrot]

Approved. This is a serious issue with no workaround.

[gopherbot]

Closed by merging 69bc821 to release-branch.go1.18.