boehm::ffi::GC_pre_incr
pub extern fn GC_pre_incr(arg1: *mut *mut c_void, arg2: ptrdiff_t) -> *mut c_void
pub extern fn GC_pre_incr(arg1: *mut *mut c_void, arg2: ptrdiff_t) -> *mut c_void
                Prefix searches with a type followed by a colon (e.g.
                fn:) to restrict the search to a given type.
            
                Accepted types are: fn, mod,
                struct (or str), enum,
                trait, typedef (or
                tdef).