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plusInstalledModuleEnv

Pepe Iborra requested to merge pepeiborra/ghc:monoid-installedmoduleenv into master

InstalledModuleEnv is abstract and lacks a Monoid instance.

This causes problems downstream:

https://github.com/haskell/haskell-language-server/pull/2323/files#diff-114002aaf66277322ecbdf45513e4a64c5080f081f3cdd83611c07d127707305R706

This PR adds a function plusInstalledModuleEnv.

(spin-off from !6922 (closed))

Edited by Pepe Iborra

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