cargo fix: Call rustc fewer times.
#13243
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This adds a set of tests which validates various edge cases around how `cargo fix` works in terms of calling `rustc` multiple times. This uses a replacement of `rustc` so it doesn't depend on the behavior of rustc itself which is not always stable.
This changes `cargo fix` so that it keeps track of the output so that it doesn't need to run the final "show the output" step.
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Update cargo 10 commits in add15366eaf3f3eb84717d3b8b71902ca36a7c84..2ce45605d9db521b5fd6c1211ce8de6055fdb24e 2024-01-02 03:24:42 +0000 to 2024-01-04 18:04:13 +0000 - feat(embedded): Add prefix-char frontmatter syntax support (rust-lang/cargo#13247) - Update dependency handlebars to v5 for mdman. (rust-lang/cargo#13249) - Deprecate rustc plugin support in cargo (rust-lang/cargo#13248) - feat(embedded): Add multiple experimental manifest syntaxes (rust-lang/cargo#13241) - chore: update auto labels (rust-lang/cargo#13244) - test: support publish package with a `public` field. (rust-lang/cargo#13245) - `cargo fix`: Call rustc fewer times. (rust-lang/cargo#13243) - chore: tracing be compat with rustc_log (rust-lang/cargo#13239) - chore(deps): update compatible (rust-lang/cargo#13227) - Contrib: Fix team HackMD links (rust-lang/cargo#13237) r? ghost
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This is an improvement of
cargo fixso that it callsrustcone fewer times per target. The original code an extra step of callingrustcto display final diagnostics to the user. Part of the reason is that in the past, cargo did not always use JSON, and socargo fixwas forced to callrustcwith and without JSON. Now that cargo uses JSON all the time, that is not necessary. This avoids the final call torustcby remembering the original output fromrustc.This needs to keep track of both the first and last output from
rustc. This is to handle the situation wherecargo fixfails to apply some suggestion (either because the verification fails, orrustfixfails). Thecargo fixoutput includes both the error, and the original diagnostics before the error.The first commit is a little test framework to exercise the various edge cases around how fix works. The comments should explain how it works, but it essentially has a
rustcreplacement that emits various different diagnostics and counts how often it is called.The subsequent commit includes the change to keep track of the output from
rustcand to avoid the final call.Fixes #13215