f6767f7a68
``` error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/unsized-str-in-return-expr-arg-and-local.rs:15:9 | LL | let x = *""; | ^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` = note: all local variables must have a statically known size = help: unsized locals are gated as an unstable feature help: references are always `Sized`, even if they point to unsized data; consider not dereferencing the expression | LL - let x = *""; LL + let x = ""; | ```
249 lines
9.0 KiB
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249 lines
9.0 KiB
Plaintext
error[E0277]: the size for values of type `Y` cannot be known at compilation time
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--> $DIR/unsized6.rs:9:9
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LL | fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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...
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LL | let y: Y;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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LL + fn f1<W: ?Sized, X: ?Sized, Y, Z: ?Sized>(x: &X) {
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help: consider borrowing here
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LL | let y: &Y;
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized6.rs:7:12
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LL | fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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LL | let _: W; // <-- this is OK, no bindings created, no initializer.
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LL | let _: (isize, (X, isize));
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| ^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= note: only the last element of a tuple may have a dynamically sized type
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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LL + fn f1<W: ?Sized, X, Y: ?Sized, Z: ?Sized>(x: &X) {
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error[E0277]: the size for values of type `Z` cannot be known at compilation time
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--> $DIR/unsized6.rs:11:12
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LL | fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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...
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LL | let y: (isize, (Z, usize));
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| ^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= note: only the last element of a tuple may have a dynamically sized type
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized>(x: &X) {
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LL + fn f1<W: ?Sized, X: ?Sized, Y: ?Sized, Z>(x: &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/unsized6.rs:15:9
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LL | fn f2<X: ?Sized, Y: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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LL | let y: X;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f2<X: ?Sized, Y: ?Sized>(x: &X) {
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LL + fn f2<X, Y: ?Sized>(x: &X) {
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help: consider borrowing here
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LL | let y: &X;
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error[E0277]: the size for values of type `Y` cannot be known at compilation time
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--> $DIR/unsized6.rs:17:12
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LL | fn f2<X: ?Sized, Y: ?Sized>(x: &X) {
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| - this type parameter needs to be `Sized`
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...
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LL | let y: (isize, (Y, isize));
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| ^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= note: only the last element of a tuple may have a dynamically sized type
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f2<X: ?Sized, Y: ?Sized>(x: &X) {
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LL + fn f2<X: ?Sized, Y>(x: &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/unsized6.rs:22:9
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LL | fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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LL | let y: X = *x1;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f3<X>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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help: consider borrowing here
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LL | let y: &X = *x1;
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized6.rs:24:9
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LL | fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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...
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LL | let y = *x2;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f3<X>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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help: references are always `Sized`, even if they point to unsized data; consider not dereferencing the expression
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LL - let y = *x2;
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LL + let y = x2;
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized6.rs:26:10
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LL | fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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...
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LL | let (y, z) = (*x3, 4);
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f3<X: ?Sized>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f3<X>(x1: Box<X>, x2: Box<X>, x3: Box<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/unsized6.rs:30:9
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LL | fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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LL | let y: X = *x1;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f4<X: T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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help: consider borrowing here
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LL | let y: &X = *x1;
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized6.rs:32:9
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LL | fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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...
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LL | let y = *x2;
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f4<X: T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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help: references are always `Sized`, even if they point to unsized data; consider not dereferencing the expression
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LL - let y = *x2;
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LL + let y = x2;
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized6.rs:34:10
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LL | fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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| - this type parameter needs to be `Sized`
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...
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LL | let (y, z) = (*x3, 4);
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| ^ doesn't have a size known at compile-time
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn f4<X: ?Sized + T>(x1: Box<X>, x2: Box<X>, x3: Box<X>) {
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LL + fn f4<X: T>(x1: Box<X>, x2: Box<X>, x3: Box<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/unsized6.rs:38:18
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LL | fn g1<X: ?Sized>(x: X) {}
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| - ^ doesn't have a size known at compile-time
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn g1<X: ?Sized>(x: X) {}
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LL + fn g1<X>(x: X) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn g1<X: ?Sized>(x: &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/unsized6.rs:40:22
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LL | fn g2<X: ?Sized + T>(x: X) {}
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| - ^ doesn't have a size known at compile-time
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| |
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn g2<X: ?Sized + T>(x: X) {}
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LL + fn g2<X: T>(x: X) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn g2<X: ?Sized + T>(x: &X) {}
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error: aborting due to 13 previous errors
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For more information about this error, try `rustc --explain E0277`.
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