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

$ go version
go version devel +9499a2e108 Sun Oct 18 08:32:19 2020 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes, both 1.14.x and 1.15.x

What operating system and processor architecture are you using (go env)?

Not relevant

What did you do?

With these programs:

package p

var c chan [2 << 16]byte

and:

package p

var c chan [2 << 16]byte

func f() {
	_ = 42
}

What did you expect to see?

Compiler emits and error, point to declaration of c.

What did you see instead?

Instead, for the first program, the line number is missing:

channel element type too large (>64kB)

The second program, the compiler point to irrelevant line (actually, lineno):

t.go:6:4: channel element type too large (>64kB)