31 lines
1.5 KiB
Rust
31 lines
1.5 KiB
Rust
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// Checks that the following does not ICE.
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//
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// Previously, this test ICEs when the `unused_must_use` lint is suppressed via the combination of
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// `-A warnings` and `--cap-lints=warn`, because:
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//
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// - Its lint diagnostic struct `UnusedDef` implements `LintDiagnostic` manually and in the impl
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// `def_path_str` was called (which calls `trimmed_def_path`, which will produce a
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// `must_produce_diag` ICE if a trimmed def path is constructed but never emitted in a diagnostic
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// because it is expensive to compute).
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// - A `LintDiagnostic` has a `decorate_lint` method which decorates a `Diag` with lint-specific
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// information. This method is wrapped by a `decorate` closure in `TyCtxt` diagnostic emission
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// machinery, and the `decorate` closure called as late as possible.
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// - `decorate`'s invocation is delayed as late as possible until `lint_level` is called.
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// - If a lint's corresponding diagnostic is suppressed (to be effectively allow at the final
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// emission time) via `-A warnings` or `--cap-lints=allow` (or `-A warnings` + `--cap-lints=warn`
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// like in this test case), `decorate` is still called and a diagnostic is still constructed --
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// but the diagnostic is never eventually emitted, triggering the aforementioned
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// `must_produce_diag` ICE due to use of `trimmed_def_path`.
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//
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// Issue: <https://github.com/rust-lang/rust/issues/121774>.
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//@ compile-flags: -Dunused_must_use -Awarnings --cap-lints=warn --crate-type=lib
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//@ check-pass
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#[must_use]
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fn f() {}
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pub fn g() {
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f();
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}
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