I use `let fileAST = parseStmt(slurp(file))` with file being a static string path to the file.
See [https://github.com/status-im/nim-beacon-chain/blob/b2b64744/tests/official/test_fixture_const_sanity_check.nim#L38](https://github.com/status-im/nim-beacon-chain/blob/b2b64744/tests/official/test_fixture_const_sanity_check.nim#L38)
