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r? libs-api

☔ The latest upstream changes (presumably #146023) made this pull request unmergeable. Please resolve the merge conflicts.

(1) My understanding is that stabilizing a feature requires an FCP, which hasn't yet happened for the linked feature.

(2) It's not clear to me that any resistence to the feature as-is exists, so maybe the whole thing could be stabilized without needing to separate out from_fn?

I would be thrilled to have someone with sufficient permissions start an FCP for debug_closure_helpers.

(1) My understanding is that stabilizing a feature requires an FCP, which hasn't yet happened for the linked feature.

I think that's true, but I was imagining that the FCP would just happen here.

(2) It's not clear to me that any resistence to the feature as-is exists, so maybe the whole thing could be stabilized without needing to separate out from_fn?

I'd be fine with that - hopefully someone will start an FCP there.

I'm closing this for now with the idea that the full feature will hopefully get FCP'd.

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.