{- This is a "referentially opaque" import (i.e. an import that is not
   globally addressable), which cannot be imported by a "referentially
   transparent" import (i.e. an import that is globally addressable).

   This test file is used in a failing test to verify that referentially
   transparent imports cannot import referentially opaque imports.  In the test
   suite this file is actually imported via its GitHub URL (not its local file
   path), so it plays the role of the referentially transparent import.  Then,
   this file attempts to import a referentially opaque import (an environment
   variable in this case) to verify that the import fails.

   For this test file we need to select a referentially opaque import that would
   likely succeed if imported on its own, so that a non-compliant implementation
   doesn't fail this test for the wrong reason (i.e. due to the referentially
   opaque not being present).  In general, we can't guarantee that referentially
   opaque imports exist (because they are referentially opaque!), but the
   `HOME` environment variable has a high likelihood of bring present on a POSIX
   system.
-}
env:HOME as Text