Fix ICE in unnecessary_to_owned
#9505
Merged
Conversation
This file contains 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
Fixes #9504 Compiler generated call `into_iter` nodes return empty substs which we need when checking it's predicates. Handle this by simply exitting when we encounter one. This change introduces false negatives in place of the ICEs.
|
Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @dswij (or someone else) soon. Please see the contribution instructions for more information. |
rust-highfive
added
the
S-waiting-on-review
|
@bors r+ |
|
☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test |
ghost
mentioned this pull request
Merged
bors
added a commit
that referenced
this pull request
Dec 4, 2022
Fix 10021 This PR proposes a fix for #10021. The problem is similar to the one that `@mikerite` described in #9505. The compiler is generating an empty substitution for a call, even though the type of `Self` seems to be needed for a predicate. In `@mikerite's` case, the call was to [`IntoFuture::into_future`](https://doc.rust-lang.org/std/future/trait.IntoFuture.html#tymethod.into_future). In this case, the call is to [`Try::branch`](https://doc.rust-lang.org/std/ops/trait.Try.html#tymethod.branch). The proposed fix is to verify that the parameter whose type is changing has an index within the substitution. The strikes me as a reasonable approach, since if the check were to fail, the following code would be a no-op: https://github.com/rust-lang/rust-clippy/blob/4c123a06ba3c2ec17d3a4dfa251dccdc5368b712/clippy_lints/src/methods/unnecessary_to_owned.rs#L420-L428 Like `@mikerite's` original solution, this solution turns ICEs into false negatives. changelog: fix `unnecessary_to_owned` false positive involving `Try::branch`
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.
Fixes #9504
Compiler generated call
into_futurenodes return empty substs which we need when checking it's predicates. Handle this by simply exitting when we encounter one. This change introduces false negatives in place of the ICEs.changelog: [
unnecessary_to_owned]: fix ICE