error[E0425]: cannot find function `bar` in this scope
  --> $DIR/non_valtreeable_const_arg-2.rs:11:16
   |
LL | impl Wrapper<{ bar() }> {
   |                ^^^ not found in this scope
   |
help: you might be missing a const parameter
   |
LL | impl<const bar: /* Type */> Wrapper<{ bar() }> {
   |     +++++++++++++++++++++++

error: using function pointers as const generic parameters is forbidden
  --> $DIR/non_valtreeable_const_arg-2.rs:8:25
   |
LL | struct Wrapper<const F: fn()>;
   |                         ^^^^
   |
   = note: the only supported types are integers, `bool`, and `char`

error[E0599]: the function or associated item `call` exists for struct `Wrapper<function>`, but its trait bounds were not satisfied
  --> $DIR/non_valtreeable_const_arg-2.rs:17:26
   |
LL | struct Wrapper<const F: fn()>;
   | ----------------------------- function or associated item `call` not found for this struct because it doesn't satisfy `Wrapper<function>: Fn<_>`
...
LL |     Wrapper::<function>::call;
   |                          ^^^^ function or associated item cannot be called on `Wrapper<function>` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `Wrapper<function>: Fn<_>`
           which is required by `&Wrapper<function>: Fn<_>`
note: the trait `Fn` must be implemented
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following trait defines an item `call`, perhaps you need to implement it:
           candidate #1: `Fn`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0425, E0599.
For more information about an error, try `rustc --explain E0425`.