Fix fix::fix_in_dependency to not rely on rustc #13220
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Update cargo 11 commits in ac6bbb33293d8d424c17ecdb42af3aac25fb7295..add15366eaf3f3eb84717d3b8b71902ca36a7c84 2023-12-26 23:22:08 +0000 to 2024-01-02 03:24:42 +0000 - chore(deps): update gix (rust-lang/cargo#13230) - chore(deps): update alpine docker tag to v3.19 (rust-lang/cargo#13228) - rustfix: Support inserting new lines. (rust-lang/cargo#13226) - Fix fix::fix_in_dependency to not rely on rustc (rust-lang/cargo#13220) - cleanup: Remove error-format special-case in `cargo fix` (rust-lang/cargo#13224) - `cargo fix`: always inherit the jobserver (rust-lang/cargo#13225) - Bump cargo-credential to 0.4.3 (rust-lang/cargo#13221) - `cargo add` - fix for adding features from repository with multiple packages. (rust-lang/cargo#13213) - Remove repetitive words (rust-lang/cargo#13216) - Add cargo:rustc-cdylib-link-arg into RESERVED_PREFIXES list (rust-lang/cargo#13212) - chore(doc): doc for custom subcommands look up. (rust-lang/cargo#13203)
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This changes the
fix::fix_in_dependencytest so that it does not rely on the behavior of rustc.This test is checking the behavior when rustc includes a suggestion diagnostic that modifies a file in CARGO_HOME from a dependency. rustc should not be emitting suggestions that point outside of the current crate, but there are some known bugs where it does this. #9938 added a workaround for this to avoid writing to CARGO_HOME.
However, the current test was relying on one of those bugs in rustc to exhibit its behavior. rust-lang/rust#119204 is fixing that particular behavior. Instead of relying on issues in rustc, this PR changes the test so that the test creates a fake
rustcexecutable that will emit a hard-coded JSON message that tellscargo fixto modify a file in CARGO_HOME. This should be stable as it is no longer relying on rustc.Testing or validating this change is a little tricky. You have to essentially comment out these three lines from the original #9938 change, and verify that the test fails (it says "Fixed" in the output). With those three lines in place, it should pass.