x_del_bword
kb_add(x_del_bword, CTRL('W'), 0);
kb_add(x_del_bword, CTRL('['), CTRL('?'), 0);
kb_add(x_del_bword, CTRL('['), CTRL('H'), 0);
kb_add(x_del_bword, CTRL('['), 'h', 0);
static int x_del_bword(int);
kb_add(x_del_bword, CTRL('['), ec->erase, 0);
kb_add(x_del_bword, ec->werase, 0);
{ x_del_bword, "delete-word-backward", XF_ARG },