https://issues.dlang.org/show_bug.cgi?id=21499

          Issue ID: 21499
           Summary: Backref mangling implementation causes OOM in some
                    edge cases
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

This PR https://github.com/dlang/dmd/pull/6998

Altered the original fail12485.d test, as it now only fails to compile due to OOM.
---
void dorecursive()
{
    recursive([0]);
}

void recursive(R)(R r)
{
    import std.algorithm;
    recursive( r.filter!(e=>true) );
}
---

Test needs reducing to not import phobos, but otherwise there should be no reason why a slowdown in compilation should occur (or infinite recursion?), nor should it be causing OOM either.

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