pub unsafe extern "C" fn s7_let_set(
sc: *mut s7_scheme,
env: s7_pointer,
sym: s7_pointer,
val: s7_pointer,
) -> s7_pointerpub unsafe extern "C" fn s7_let_set(
sc: *mut s7_scheme,
env: s7_pointer,
sym: s7_pointer,
val: s7_pointer,
) -> s7_pointer