| //@ revisions: full min |
| |
| #![cfg_attr(full, feature(adt_const_params))] |
| #![cfg_attr(full, allow(incomplete_features))] |
| |
| use std::ffi::{c_char, CStr, CString}; |
| |
| unsafe fn unsafely_do_the_thing<const F: fn(&CStr) -> usize>(ptr: *const c_char) -> usize { |
| //~^ ERROR: using function pointers as const generic parameters is forbidden |
| F(CStr::from_ptr(ptr)) |
| } |
| |
| fn safely_do_the_thing(s: &CStr) -> usize { |
| s.to_bytes().len() |
| } |
| |
| fn main() { |
| let baguette = CString::new("baguette").unwrap(); |
| let ptr = baguette.as_ptr(); |
| println!("{}", unsafe { unsafely_do_the_thing::<safely_do_the_thing>(ptr) }); |
| } |
