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MultiInstances

v6	v7
10	10
11	11	* ghc-pkg: do not overwrite previous instances in the package DB
	12	* but we need to think about the case where it's the "same" package being re-registered, e.g. it's actually installed in the same file system location as the old instance, and the old files are no longer. This worry applies to the current `ghc-pkg update` command.
12	13
13	14	* GHC: discard conflicting instances during its shadowing phase
…	…
23	24
24	25	* Cabal: will the dependency solver work correctly in the presence of multiple package instances?
25		* Andres claims it will ~~(maybe only the new solver?~~)
	26	* Andres claims it will using the new solver. (There is now no point in updating the old solver, though it'd be technically possible.)
26	27
27	28	* ghc-pkg cleanup: remove old/unused instances of packages
28		* how can we tell when something is unnecessary?
	29	* how can we tell when something is unnecessary? This is actually rather hard because unlike Nix we do not track every random executable that the user compiles.
29	30
30	31	== Next step: dealing with ways ==