https://bugs.llvm.org/show_bug.cgi?id=41685

            Bug ID: 41685
           Summary: Some tests fail when specifying `-debug_level=X` via
                    lit
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangb...@nondot.org
          Reporter: mclow.li...@gmail.com
                CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com

Running lit with --param="debug_level=1" causes the following tests to fail:

    libc++ :: std/algorithms/alg.sorting/alg.merge/inplace_merge_comp.pass.cpp
    libc++ :: std/containers/sequences/vector/iterators.pass.cpp
    libc++ ::
std/input.output/filesystems/class.path/path.nonmember/path.factory.pass.cpp
    libc++ ::
std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
    libc++ ::
std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp

Some of these (like the first one) should be easy to fix.

The "iterators" ones appear to be because the debug infrastructure has not been
updated to deal with N3644, which added the fact that default-constructed
iterators are equivalent to all container's end iterator.

I don't know what's up with the filesystem tests.

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