Use source maps to make exception backtraces more useful. - #11
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(This pull request includes the commit from #10, so you may want to merge that first.)
I got tired of seeing useless backtraces from tests that raise exceptions, so I decided to use the sourcemaps provided by
Opal::Serverto filter backtraces, translating locations in generated Javascript to source locations in the original Ruby where possible. It's a little hacky so please feel free to suggest improvements!