07e7823c01
If a symbol name can only be imported from one place for a type, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path and print only the name. This has wide implications on error messages with types, for example, shortening `std::vec::Vec` to just `Vec`, as long as there is no other `Vec` importable anywhere. This adds a new '-Z trim-diagnostic-paths=false' option to control this feature. On the good path, with no diagnosis printed, we should try to avoid issuing this query, so we need to prevent trimmed_def_paths query on several cases. This change also relies on a previous commit that differentiates between `Debug` and `Display` on various rustc types, where the latter is trimmed and presented to the user and the former is not.
16 lines
310 B
Rust
16 lines
310 B
Rust
// Regression test for #15896. It used to ICE rustc.
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fn main() {
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enum R { REB(()) }
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struct Tau { t: usize }
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enum E { B(R, Tau) }
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let e = E::B(R::REB(()), Tau { t: 3 });
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let u = match e {
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E::B(
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Tau{t: x},
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//~^ ERROR mismatched types
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_) => x,
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};
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}
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