[llvm-bugs] [Bug 41685] New: Some tests fail when specifying `-debug_level=X` via lit

[via llvm-bugs]

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: unassignedclangbugs at nondot.org
          Reporter: mclow.lists at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at 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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