error[E0412]: cannot find type `Idx` in this scope
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:30
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                              ^^^ not found in this scope

error[E0412]: cannot find type `Idx` in this scope
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:38
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                                      ^^^ not found in this scope

error[E0277]: the size for values of type `[bool]` cannot be known at compilation time
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:9:22
   |
LL | const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
   |                      ^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `[bool]`
note: required by an implicit `Sized` bound in `MySlice`
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:16
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                ^ required by the implicit `Sized` requirement on this type parameter in `MySlice`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:16
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                ^                                - ...if indirection were used here: `Box<T>`
   |                |
   |                this could be changed to `T: ?Sized`...

error[E0277]: the size for values of type `[bool]` cannot be known at compilation time
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:9:22
   |
LL | const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
   |                      ^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `[bool]`
note: required by an implicit `Sized` bound in `MySlice`
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:16
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                ^ required by the implicit `Sized` requirement on this type parameter in `MySlice`
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
  --> $DIR/ice-unsized-struct-arg-issue-121612.rs:5:16
   |
LL | struct MySlice<T: FnOnce(&T, Idx) -> Idx>(bool, T);
   |                ^                                - ...if indirection were used here: `Box<T>`
   |                |
   |                this could be changed to `T: ?Sized`...
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0277, E0412.
For more information about an error, try `rustc --explain E0277`.