I've been working on this patch:
https://github.com/dlang/dmd/pull/6068
which fixes up some severe flaws in the inline assembler. But I've hit a roadblock.

The patch is almost correct, everything *appears* to be working as intended, except for this obscure bug that has somehow been introduced as a side effect of the patch:

    Makefile:205: recipe for target 'test_results/d_do_test.exe' failed
    gmake: *** [test_results/d_do_test.exe] Error 127

See my latest comment for details: https://github.com/dlang/dmd/pull/6068#issuecomment-242147910

The problem is, I don't know where to start with debugging this. I'm really struggling to envision how my patch could've caused it. Even some basic suggestions or speculation would be much appreciated.

This is my first time working on the DMD codebase, so I've been discovering the details of its componentry along the way as I diagnosed the bugs I encountered. Because this bug is manifesting outside the compiler, I can't think of how I can trace it back to its source.

Thanks for any help you can provide. I've been working hard on this patch, so I really want to see it completed.
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