mirror of
https://github.com/rust-lang/rust
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c4c22b0d52
```
error[E0277]: the size for values of type `[i32]` cannot be known at compilation time
--> f100.rs:2:33
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2 | let _ = std::mem::size_of::<[i32]>();
| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[i32]`
note: required by an implicit `Sized` bound in `std::mem::size_of`
--> /home/gh-estebank/rust/library/core/src/mem/mod.rs:312:22
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312 | pub const fn size_of<T>() -> usize {
| ^ required by the implicit `Sized` requirement on this bound in `size_of`
```
Fix #120178.
91 lines
3.5 KiB
Plaintext
91 lines
3.5 KiB
Plaintext
error[E0277]: the size for values of type `U` cannot be known at compilation time
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--> $DIR/suggest-where-clause.rs:7:20
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LL | fn check<T: Iterator, U: ?Sized>() {
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| - this type parameter needs to be `Sized`
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LL | // suggest a where-clause, if needed
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LL | mem::size_of::<U>();
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| ^ doesn't have a size known at compile-time
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note: required by an implicit `Sized` bound in `std::mem::size_of`
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--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn check<T: Iterator, U: ?Sized>() {
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LL + fn check<T: Iterator, U>() {
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error[E0277]: the size for values of type `U` cannot be known at compilation time
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--> $DIR/suggest-where-clause.rs:10:20
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LL | fn check<T: Iterator, U: ?Sized>() {
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| - this type parameter needs to be `Sized`
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...
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LL | mem::size_of::<Misc<U>>();
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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 `Misc<U>`
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--> $DIR/suggest-where-clause.rs:3:8
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LL | struct Misc<T:?Sized>(T);
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| ^^^^
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note: required by an implicit `Sized` bound in `std::mem::size_of`
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--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn check<T: Iterator, U: ?Sized>() {
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LL + fn check<T: Iterator, U>() {
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error[E0277]: the trait bound `u64: From<T>` is not satisfied
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--> $DIR/suggest-where-clause.rs:15:6
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LL | <u64 as From<T>>::from;
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| ^^^ the trait `From<T>` is not implemented for `u64`
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help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
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LL | fn check<T: Iterator, U: ?Sized>() where u64: From<T> {
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| ++++++++++++++++++
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error[E0277]: the trait bound `u64: From<<T as Iterator>::Item>` is not satisfied
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--> $DIR/suggest-where-clause.rs:18:6
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LL | <u64 as From<<T as Iterator>::Item>>::from;
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| ^^^ the trait `From<<T as Iterator>::Item>` is not implemented for `u64`
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help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
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LL | fn check<T: Iterator, U: ?Sized>() where u64: From<<T as Iterator>::Item> {
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| ++++++++++++++++++++++++++++++++++++++
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error[E0277]: the trait bound `Misc<_>: From<T>` is not satisfied
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--> $DIR/suggest-where-clause.rs:23:6
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LL | <Misc<_> as From<T>>::from;
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| ^^^^^^^ the trait `From<T>` is not implemented for `Misc<_>`
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error[E0277]: the size for values of type `[T]` cannot be known at compilation time
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--> $DIR/suggest-where-clause.rs:28:20
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LL | mem::size_of::<[T]>();
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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 `[T]`
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note: required by an implicit `Sized` bound in `std::mem::size_of`
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--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
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error[E0277]: the size for values of type `[&U]` cannot be known at compilation time
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--> $DIR/suggest-where-clause.rs:31:20
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LL | mem::size_of::<[&U]>();
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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 `[&U]`
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note: required by an implicit `Sized` bound in `std::mem::size_of`
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--> $SRC_DIR/core/src/mem/mod.rs:LL:COL
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error: aborting due to 7 previous errors
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For more information about this error, try `rustc --explain E0277`.
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