Actually, it is not so bad as I thought. Without `PredefModule` special case only 11 tests failed and only `reify_csv` failed with exception during `eval`. Other 10 can be fixed by correcting .check files.

    /opt/git-repos/scala/test/files/run/showraw_tree_ultimate.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree_types_typed.scala [FAILED]
    /opt/git-repos/scala/test/files/run/reify_csv.scala [FAILED]
    /opt/git-repos/scala/test/files/run/idempotency-this.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree_kinds.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree_ids.scala [FAILED]
    /opt/git-repos/scala/test/files/run/reify_ann2a.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree_types_ids.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree_types_untyped.scala [FAILED]
    /opt/git-repos/scala/test/files/run/t2886.scala [FAILED]
    /opt/git-repos/scala/test/files/run/showraw_tree.scala [FAILED]