error[E0015]: cannot call non-const fn `copy::copy::` in constant functions --> $DIR/intrinsic_without_const_stab.rs:13:14 | LL | unsafe { copy(src, dst, count) } | ^^^^^^^^^^^^^^^^^^^^^ | = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants error: aborting due to previous error For more information about this error, try `rustc --explain E0015`.