error[E0015]: cannot call non-const fn `regular_in_block` in constant functions
  --> $DIR/const-extern-fn-call-extern-fn.rs:9:9
   |
LL |         regular_in_block();
   |         ^^^^^^^^^^^^^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error[E0015]: cannot call non-const fn `regular` in constant functions
  --> $DIR/const-extern-fn-call-extern-fn.rs:18:9
   |
LL |         regular();
   |         ^^^^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error: aborting due to 2 previous errors

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