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.
94 lines
3.1 KiB
Plaintext
94 lines
3.1 KiB
Plaintext
error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized3.rs:7:13
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LL | fn f1<X: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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LL | f2::<X>(x);
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| ^ doesn't have a size known at compile-time
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...
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LL | fn f2<X>(x: &X) {
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| - required by this bound in `f2`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn f2<X: ?Sized>(x: &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/unsized3.rs:18:13
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LL | fn f3<X: ?Sized + T>(x: &X) {
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| - this type parameter needs to be `Sized`
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LL | f4::<X>(x);
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| ^ doesn't have a size known at compile-time
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...
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LL | fn f4<X: T>(x: &X) {
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| - required by this bound in `f4`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn f4<X: T + ?Sized>(x: &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/unsized3.rs:33:8
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LL | fn f5<Y>(x: &Y) {}
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| - required by this bound in `f5`
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...
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LL | fn f8<X: ?Sized>(x1: &S<X>, x2: &S<X>) {
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| - this type parameter needs to be `Sized`
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LL | f5(x1);
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| ^^ doesn't have a size known at compile-time
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= note: required because it appears within the type `S<X>`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn f5<Y: ?Sized>(x: &Y) {}
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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/unsized3.rs:40:8
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LL | fn f9<X: ?Sized>(x1: Box<S<X>>) {
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| - this type parameter needs to be `Sized`
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LL | f5(&(*x1, 34));
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| ^^^^^^^^^^ doesn't have a size known at compile-time
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= note: required because it appears within the type `S<X>`
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= note: only the last element of a tuple may have a dynamically sized type
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized3.rs:45:9
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LL | fn f10<X: ?Sized>(x1: Box<S<X>>) {
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| - this type parameter needs to be `Sized`
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LL | f5(&(32, *x1));
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| ^^^^^^^^^ doesn't have a size known at compile-time
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= note: required because it appears within the type `S<X>`
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= note: required because it appears within the type `({integer}, S<X>)`
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= note: tuples must have a statically known size to be initialized
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized3.rs:45:8
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LL | fn f5<Y>(x: &Y) {}
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| - required by this bound in `f5`
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...
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LL | fn f10<X: ?Sized>(x1: Box<S<X>>) {
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| - this type parameter needs to be `Sized`
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LL | f5(&(32, *x1));
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| ^^^^^^^^^^ doesn't have a size known at compile-time
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= note: required because it appears within the type `S<X>`
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= note: required because it appears within the type `({integer}, S<X>)`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn f5<Y: ?Sized>(x: &Y) {}
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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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