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.
116 lines
4 KiB
Text
116 lines
4 KiB
Text
error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized5.rs:4:9
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LL | struct S1<X: ?Sized> {
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| - this type parameter needs to be `Sized`
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LL | f1: X,
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| ^ doesn't have a size known at compile-time
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= note: only the last field of a struct may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | f1: &X,
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | f1: Box<X>,
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| ^^^^ ^
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized5.rs:10:8
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LL | struct S2<X: ?Sized> {
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| - this type parameter needs to be `Sized`
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LL | f: isize,
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LL | g: X,
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| ^ doesn't have a size known at compile-time
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= note: only the last field of a struct may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | g: &X,
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | g: Box<X>,
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| ^^^^ ^
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error[E0277]: the size for values of type `str` cannot be known at compilation time
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--> $DIR/unsized5.rs:15:8
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LL | f: str,
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| ^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `str`
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= note: only the last field of a struct may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | f: &str,
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | f: Box<str>,
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| ^^^^ ^
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error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
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--> $DIR/unsized5.rs:20:8
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LL | f: [u8],
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| ^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[u8]`
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= note: only the last field of a struct may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | f: &[u8],
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | f: Box<[u8]>,
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| ^^^^ ^
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized5.rs:25:8
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LL | enum E<X: ?Sized> {
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| - this type parameter needs to be `Sized`
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LL | V1(X, isize),
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | V1(&X, isize),
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | V1(Box<X>, isize),
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| ^^^^ ^
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized5.rs:29:12
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LL | enum F<X: ?Sized> {
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| - this type parameter needs to be `Sized`
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LL | V2{f1: X, f: isize},
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | V2{f1: &X, f: isize},
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| ^
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | V2{f1: Box<X>, f: isize},
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| ^^^^ ^
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error: aborting due to 6 previous errors
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For more information about this error, try `rustc --explain E0277`.
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