— Undo one variable binding
ecl_bds_unwind1 undoes the outermost variable binding, restoring the original value of the symbol in the process.
ecl_bds_unwind_n does the same, but for the
n last variables.
Every variable binding must undone when no longer needed. It is best practice to match each call to
ecl_bds_bind by another call to
ecl_bds_unwind in the same function.