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.
14 lines
650 B
Rust
14 lines
650 B
Rust
#![feature(box_into_boxed_slice)]
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use std::boxed::Box;
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use std::fmt::Debug;
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fn main() {
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let boxed_slice = Box::new([1,2,3]) as Box<[u8]>;
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let _ = Box::into_boxed_slice(boxed_slice);
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//~^ ERROR the size for values of type `[u8]` cannot be known at compilation time
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//~^^ ERROR the size for values of type `[u8]` cannot be known at compilation time
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let boxed_trait: Box<dyn Debug> = Box::new(5u8);
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let _ = Box::into_boxed_slice(boxed_trait);
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//~^ ERROR the size for values of type `dyn Debug` cannot be known at compilation time
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//~^^ ERROR the size for values of type `dyn Debug` cannot be known at compilation time
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}
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