cmd/compile: internal compiler error: assertion failed [1.18 backport]

[gopherbot]

@randall77 requested issue #53254 to be considered for backport to the next 1.18 minor release.

@gopherbot please open a backport issue to 1.18.

[randall77]

This is a compiler crash for somewhat strange but plausible code.

[gopherbot]

Change https://go.dev/cl/416694 mentions this issue: [release-branch.go1.18] cmd/compile: don't use dictionary convert to shaped empty interface

[cherrymui]

This is a generics issue that is not a revert. As we discussed in #53852 (comment) , we will stop backporting non-revert generics issues to 1.18, so we don't destabilize Go 1.18. Generics improvements will land on Go 1.19.x. Thanks.