bug(#268): test for EO application-duality false alarm

[h1alexbel]

In this PR I've added test that proves the work of application-duality lint with EO test case

see #268

[h1alexbel]

@yegor256 This snippet does not warn about application duality:

# Foo.
[] > foo
  a > @
    "first".as-bytes:0
    "second":1

Maybe I missing something here?

[0crat]

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