[llvm-dev] [CommandLine] Unable to implement a custom parser -- all marked final

[Don Hinton via llvm-dev]

https://llvm.org/docs/CommandLine.html#writing-a-custom-parser describes
how to implement a custom parser, but they're all marked `final`, so I
can't inherit.

Is there a reason for this?  If not, I'll submit patch with tests.

thanks...
don
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