warning: skipping const checks
  --> $DIR/const_fn_ptr.rs:12:5
   |
LL |     X(x)
   |     ^^^^

warning: skipping const checks
  --> $DIR/const_fn_ptr.rs:16:5
   |
LL |     X_const(x)
   |     ^^^^^^^^^^

warning: skipping const checks
  --> $DIR/const_fn_ptr.rs:20:5
   |
LL |     x(y)
   |     ^^^^

warning: constant `X_const` should have an upper case name
  --> $DIR/const_fn_ptr.rs:9:7
   |
LL | const X_const: fn(usize) -> usize = double_const;
   |       ^^^^^^^ help: convert the identifier to upper case: `X_CONST`
   |
   = note: `#[warn(non_upper_case_globals)]` on by default