def obtain(self, requirement, installer=None):
        if installer is not None:
            return installer(requirement)
Calls ghc-mod with the given arguments.
dataset/ETHPy150Open anzev/hedwig/build/pip/pip/_vendor/pkg_resources/__init__.py/Environment.obtain--crossover with--dataset/ETHPy150Open SublimeHaskell/SublimeHaskell/sublime_haskell_common.py/call_ghcmod_and_wait