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  • Matthew Pickering's avatar
    Key ModSummary cache by UnitId as well as FilePath · 4fe9eaff
    Matthew Pickering authored and Marge Bot's avatar Marge Bot committed
    Multiple units can refer to the same files without any problem. Just
    another assumption which needs to be updated when we may have multiple
    home units.
    However, there is the invariant that within each unit each file only
    maps to one module, so as long as we also key the cache by UnitId then
    we are all good.
    This led to some confusing behaviour in GHCi when reloading,
    multipleHomeUnits_shared distils the essence of what can go wrong.
    Fixes #22679