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Ryan Scott authored
Summary: The addition of rigorous pretty-printer tests (499e4382) had the unfortunate side-effect of revealing a bug in `hsSyn/Convert.hs` wherein instances are _always_ qualified with an instance context, even if the context is empty. This led to instances like this: ``` instance Foo Int ``` being pretty-printed like this! ``` instance () => Foo Int ``` We can prevent this by checking if the context is empty before adding an HsQualTy to the type. Also does some refactoring around HsForAllTys in `Convert` while I was in town. Fixes #13183. Test Plan: ./validate Reviewers: goldfire, bgamari, austin, alanz Reviewed By: alanz Subscribers: mpickering, thomie Differential Revision: https://phabricator.haskell.org/D3018 GHC Trac Issues: #13183
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