std::sys::pal::unix::weak

Macro dlsym

Source 
pub(crate) macro dlsym {
    (fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty;) => { ... },
    (
        #[link_name = $sym:expr]
        fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty;
    ) => { ... },
}