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Ensure that distributions matching `requirements` are activated

`requirements` must be a string or a (possibly-nested) sequence
thereof, specifying the distributions and versions required.  The
return value is a sequence of the distributions that needed to be
activated to fulfill the requirements; all relevant distributions are
included, even if they were already activated in this working set.

src/m/e/merlin-1-1.0/merlin/archimedes/__init__.py   merlin(Download)
    try:
        import merlin
        merlin.require(reqSpec)
    except ImportError:
        bootstrap()
    import merlin
    try:
        merlin.require(reqSpec)
    except merlin.VersionConflict:
        from merlin import main