let then_ln = self.propagate_through_expr(&then, succ);
let ln = self.live_node(expr.hir_id, expr.span);
self.init_from_succ(ln, else_ln);
let then_ln = self.propagate_through_expr(&then, succ);
let ln = self.live_node(expr.hir_id, expr.span);
self.init_from_succ(ln, else_ln);