error[E0599]: no function or associated item named `assert` found for struct `Bool<{ std::mem::needs_drop::<T>() }>` in the current scope
  --> $DIR/const-needs_drop-monomorphic.rs:11:46
   |
LL | struct Bool<const B: bool> {}
   | -------------------------- function or associated item `assert` not found for this struct
...
LL |     Bool::<{ std::mem::needs_drop::<T>() }>::assert();
   |                                              ^^^^^^ function or associated item cannot be called on `Bool<{ std::mem::needs_drop::<T>() }>` due to unsatisfied trait bounds

error: unconstrained generic constant
  --> $DIR/const-needs_drop-monomorphic.rs:11:5
   |
LL |     Bool::<{ std::mem::needs_drop::<T>() }>::assert();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | fn f<T>() where [(); { std::mem::needs_drop::<T>() } as usize]: {
   |           +++++++++++++++++++++++++++++++++++++++++++++++++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.