This test exercises the panic reported in golang/go#61813.

-- p.go --
package p

type P struct{}

func (P) M() {} //@rename("M", "N", MToN)

var x = []*P{{}}
-- @MToN/p.go --
@@ -5 +5 @@
-func (P) M() {} //@rename("M", "N", MToN)
+func (P) N() {} //@rename("M", "N", MToN)