Macro std::sys::windows::compat::compat_fn_optional

macro_rules! compat_fn_optional {
    ($load_functions:expr;
    $(
        $(#[$meta:meta])*
        $vis:vis fn $symbol:ident($($argname:ident: $argtype:ty),*) $(-> $rettype:ty)?;
    )+) => { ... };
}

Optionally loaded functions.

Actual loading of the function defers to $load_functions.