Backport "Fix validity period of derived SingleDenotations" to LTS #21026
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
When running:
val f: ( => Int) => Int = i => i ; f(1)
twice in the REPL, the second time crashed with a ClassCastException.
The difference is that in the second run, the denotation for `f.apply` is
created from the SymDenotation for `Function1#apply` which already exists and is
known to be valid in every phase, but that doesn't mean that the derived
denotation for `f.apply` has the same validity: unlike the SymDenotation it
needs to be transformed (in particular to run the `ElimByName` transformer).
It turns out that there were multiple places in the compiler where we created a
new denotation with a validity based on the existing one when this was not
legitimate. I've gone through all these places and replaced them by
`currentStablePeriod`.
Fixes #18756.
[Cherry-picked 49571fa]
|
No regressions detected in the community build up to lts-20295. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backports #19983 to the LTS branch.
PR submitted by the release tooling.
[skip ci]