error[E0015]: cannot call non-const fn `create_some` in constants
  --> $DIR/E0015.rs:5:25
   |
LL | const FOO: Option<u8> = create_some();
   |                         ^^^^^^^^^^^^^
   |
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0015`.