go/types: type mismatch error less helpful since go 1.18

[gnojus]

What version of Go are you using (go version)?

$ go version
go version go1.19.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

https://go.dev/play/p/rctUQ2F2oSI

package main

func main() {
	_ = 0 < new(int)
}

go 1.17:

./main.go:4:8: invalid operation: 0 < new(int) (mismatched types int and *int)

go 1.18/19/tip:

./main.go:4:6: cannot convert 0 (untyped int constant) to *int

Also, even if the constant could be converted to *int, the < operator is not defined on it.

[seankhliao]

cc @griesemer @findleyr

[gopherbot]

Change https://go.dev/cl/457055 mentions this issue: go/types, types2: report type mismatch error when conversion is impossible