[6.0🍒] Consume: warn about no-op consumes to be fixed #75457
Merged
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
As of now, SE-366 is not correctly implemented with respect to concrete, bitwise-copyable types like `Int`. Writing `consume someInt` doesn't actually consume the variable binding as it should, meaning code that should be flagged as having a use-after-consume is being silently permitted: ```swift let someInt = 10 let y = consume someInt print(someInt) // no error! ``` This has been a problem since Swift 5.9. Eventually we plan to fix this issue, which means code previously doing the above would become an error. To help people get ready for the fix, start warning people that these consumes are actually no-ops and suggest removing them until the intended behavior is actually enforced in the future. resolves rdar://127081103 (cherry picked from commit e04b35d)
(cherry picked from commit ab75611)
|
@swift-ci test |
tbkka
approved these changes
Jul 24, 2024
nate-chandler
approved these changes
Jul 25, 2024
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Outdated suggestions cannot be applied.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.
consumethat are known to be effectively no-ops in SIL, so they're not actually consuming anything. We plan to fix this in the future, which will result in source breaks in the future for code such as:-warnings-as-errors. There is a fix-it to remove the offendingconsume.