cmd/compile: cannot use .this ( type *T[interface{}]) as type T[go.shape.interface {}_0] in T[go.shape.interface {}_0].Method #50486
Description
What version of Go are you using (go version)?
$ go version go version devel go1.18-07525e1 Fri Jan 7 00:15:59 2022 +0000 darwin/amd64
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (go env)?
The gotip playground
What did you do?
https://gotipplay.golang.org/p/vuF7acfKTIv
What did you expect to see?
No Error.
What did you see instead?
# goerror
<autogenerated>:1: cannot use .this (type *fp.Seq[interface {}]) as type fp.Seq[go.shape.interface {}_0] in argument to fp.Seq[go.shape.interface {}_0].Append
<autogenerated>:1: cannot use .this (type *fp.Seq[interface {}]) as type fp.Seq[go.shape.interface {}_0] in argument to fp.Seq[go.shape.interface {}_0].Iterator
<autogenerated>:1: cannot use .this (type *fp.Seq[interface {}]) as type fp.Seq[go.shape.interface {}_0] in argument to fp.Seq[go.shape.interface {}_0].Size
If I remove ToSeq or Map method of Iterator, the error goes away.