error[E0308]: mismatched types
   --> /home/eugene/.cargo/git/checkouts/alpm.rs-a0070a235cf20bfa/306342e/alpm/src/cb.rs:244:60
    |
244 |         unsafe { alpm_option_set_logcb(self.as_ptr(), Some(cb), &*ctx as *const _ as *mut _) };
    |                                                       ---- ^^ expected fn pointer, found fn item
    |                                                       |
    |                                                       arguments to this enum variant are incorrect
    |
    = note: expected fn pointer `unsafe extern "C" fn(_, _, _, *mut __va_list_tag)`
                  found fn item `extern "C" fn(_, _, _, [__va_list_tag; 1]) {logcb::<LogCbImpl<T, F>>}`
help: the type constructed contains `extern "C" fn(*mut c_void, u32, *const u8, [__va_list_tag; 1]) {logcb::<LogCbImpl<T, F>>}` due to the type of the argument passed
   --> /home/eugene/.cargo/git/checkouts/alpm.rs-a0070a235cf20bfa/306342e/alpm/src/cb.rs:244:55
    |
244 |         unsafe { alpm_option_set_logcb(self.as_ptr(), Some(cb), &*ctx as *const _ as *mut _) };
    |                                                       ^^^^^--^
    |                                                            |
    |                                                            this argument influences the type of `Some`
note: tuple variant defined here
   --> /build/rust/src/rustc-1.79.0-src/library/core/src/option.rs:579:5