190589f8a7
When a trait bound is not met and restricting a type parameter would make the restriction hold, use a structured suggestion pointing at an appropriate place (type param in param list or `where` clause). Account for opaque parameters where instead of suggesting extending the `where` clause, we suggest appending the new restriction: `fn foo(impl Trait + UnmetTrait)`.
90 lines
4.2 KiB
Plaintext
90 lines
4.2 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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| -- help: consider further restricting this bound: `X: std::marker::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: the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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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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| -- help: consider further restricting this bound: `X: std::marker::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: the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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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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| -- help: consider further restricting this bound: `X: std::marker::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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= help: within `S<X>`, the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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= note: required because it appears within the type `S<X>`
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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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| -- help: consider further restricting this bound: `X: std::marker::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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= help: within `S<X>`, the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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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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| -- help: consider further restricting this bound: `X: std::marker::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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= help: within `({integer}, S<X>)`, the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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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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| -- help: consider further restricting this bound: `X: std::marker::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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= help: within `({integer}, S<X>)`, the trait `std::marker::Sized` is not implemented for `X`
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= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
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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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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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