"package io/fs is not in GOROOT" on Go 1.15

[soranoba]

Issue Description

If we update to echo v4.3.0, go mod tidy will fail except for Go 1.16.
golang-migrate/migrate#480 was detailed.
(go-migrate seems to have chosen to revert)

$ go mod tidy
github.com/xxx/xxxx/pkg/server imports
	github.com/labstack/echo/v4/middleware tested by
	github.com/labstack/echo/v4/middleware.test imports
	io/fs: package io/fs is not in GOROOT (/usr/local/Cellar/go/1.15.8/libexec/src/io/fs)
github.com/xxx/xxxx/pkg/server imports
	github.com/labstack/echo/v4/middleware tested by
	github.com/labstack/echo/v4/middleware.test imports
	testing/fstest: package testing/fstest is not in GOROOT (/usr/local/Cellar/go/1.15.8/libexec/src/testing/fstest)

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behaviour

Actual behaviour

Steps to reproduce

Working code to debug

package main

func main() {
}

Version/commit

v4.3.0

[aldas]

@soranoba if you update Go version to 1.15.12 - does it make any difference?

[soranoba]

Ah... Thanks.
It fixes on Go 1.15.12

[aldas]

Just for readers in future - that go mod problem was fixed in pre 1.16 versions soon after 1.16 was released. I think in 1.15.10 or 1.15.11 version.

[tte]

Bumped into the same issue with go1.14.14 and go mod tidy

io/fs: package io/fs is not in GOROOT
...
testing/fstest: package testing/fstest is not in GOROOT

as @aldas mentioned, you need to update the version of go >= 1.15.10

[Sri-Nikitha-K]

Facing the same issue in go->go1.19.3

On running "gcloud app deploy"
package io/fs is not in GOROOT