// byte to record active defers.
			// Also don't allow if we need to use deferprocat.
			ir.CurFunc.SetOpenCodedDeferDisallowed(true)
		}
		if n.Esc() != ir.EscNever {
			// If n.Esc is not EscNever, then this defer occurs in a loop,
			// so open-coded defers cannot be used in this function.
			ir.CurFunc.SetOpenCodedDeferDisallowed(true)
		}
		fallthrough
	case ir.OGO:
		n := n.(*ir.GoDeferStmt)
		return walkGoDefer(n)

func (f *Func) SetInlinabilityChecked(b bool)      { f.flags.set(funcInlinabilityChecked, b) }
func (f *Func) SetNeverReturns(b bool)             { f.flags.set(funcNeverReturns, b) }
func (f *Func) SetOpenCodedDeferDisallowed(b bool) { f.flags.set(funcOpenCodedDeferDisallowed, b) }
func (f *Func) SetClosureResultsLost(b bool)       { f.flags.set(funcClosureResultsLost, b) }

			// body that might add defers to this frame, so we cannot use open-coded defers
			// and we need to call deferreturn even if we don't see any other explicit defers.
			ir.CurFunc.SetHasDefer(true)
			ir.CurFunc.SetOpenCodedDeferDisallowed(true)
		}
	}

	walkCall1(n, init)
	return n
}

func walkCall1(n *ir.CallExpr, init *ir.Nodes) {
	if n.Walked() {
		return // already walked
	}
	n.SetWalked(true)