Implement "reexported-modules" field, towards fixing GHC bug #8407.
Re-exported modules allow packages to reexport modules from their dependencies without having to create stub files. Reexports of the same original module don't count as ambiguous imports when module finding occurs. The syntax is: "orig-pkg" OrigName as NewName You can omit 'as NewName', in which case it is reexported as the same name. Self referential aliases work too; however, they're only visible to packages which depend on this package. Left to future work: just provide a module name 'OrigName', where ghc-pkg figures out what the source package is. Signed-off-by: Edward Z. Yang <firstname.lastname@example.org>