This module provides build-dependent implementations of the io/fs and testing/fstest packages, which were introduced in go 1.16.
With go 1.16 or later, an implementation which aliases the standard library is used.
With an earlier version of go, a forked version of the go 1.16 implementation is used.
This allows the use of io/fs features without immediately requiring go 1.16, but this shim should be removed as soon as it's reasonable to require go 1.16.