Macro winwrap::e_make_func

macro_rules! e_make_func {
    ($($pa:ident)::*, $(#[$outer:meta])* pub fn $func:ident($($p:ident: $t:ty,)*) -> $ret:ty;$err_pat:pat$(,)?) => { ... };
    ($($pa:ident)::*, $(#[$outer:meta])* pub unsafe fn $func:ident($($p:ident: $t:ty,)*) -> $ret:ty;$err_pat:pat$(,)?) => { ... };
    ($($pa:ident)::*, $(#[$outer:meta])* pub safe fn $func:ident($($p:ident: $t:ty,)*) -> $ret:ty;$err_pat:pat$(,)?) => { ... };
}

Returns Result<$ret,()>.

This does not use GetLastError().