src/test/ui/consts/min_const_fn/min_const_fn_fn_ptr.rs

struct HasPtr {
    field: fn(),
}

struct Hide(HasPtr);

fn field() {}

const fn no_inner_dyn_trait(_x: Hide) {}
const fn no_inner_dyn_trait2(x: Hide) {
    x.0.field;
//~^ ERROR function pointers in const fn
}
const fn no_inner_dyn_trait_ret() -> Hide { Hide(HasPtr { field }) }
//~^ ERROR function pointers in const fn

fn main() {}