error[E0015]: calls in statics are limited to constant functions, tuple structs and tuple variants
  --> $DIR/issue-16538.rs:23:27
   |
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `*const usize` cannot be shared between threads safely
  --> $DIR/issue-16538.rs:23:1
   |
LL | static foo: *const Y::X = Y::foo(Y::x as *const Y::X);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `*const usize` cannot be shared between threads safely
   |
   = help: the trait `std::marker::Sync` is not implemented for `*const usize`
   = note: shared static variables must have a type that implements `Sync`

error: aborting due to 2 previous errors

Some errors occurred: E0015, E0277.
For more information about an error, try `rustc --explain E0015`.