Transformable.cpp was originally compiled when I first submitted
PR #1973. While that PR was in review, #2012 got merged which
changed how tests are compiled. These two PR were in conflict so
when I went to resolve conflicts on #1973, I accidentaly removed
the line which added Transformable.cpp to the build. Because not
compiling this file caused no build breaks, nobody noticed until
after #1973 got merged. My bad, everybody.
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