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.
22 lines
798 B
Text
22 lines
798 B
Text
error[E0005]: refutable pattern in local binding: `None` not covered
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--> $DIR/E0005.rs:3:9
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LL | let Some(y) = x;
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| ^^^^^^^ pattern `None` not covered
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::: $SRC_DIR/core/src/option.rs:LL:COL
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LL | None,
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| ---- not covered
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= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
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= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
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= note: the matched value is of type `Option<i32>`
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help: you might want to use `if let` to ignore the variant that isn't matched
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LL | if let Some(y) = x { /* */ }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0005`.
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