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thomasw authored
Summary: Type brackets containing a wildcard, e.g. `[t| _ |]`, caused a panic. Fix it by disallowing wildcards in type brackets. Together with D572, this fixes #9879. Test Plan: new test WildcardInTypeBrackets should pass Reviewers: austin Reviewed By: austin Subscribers: carter, thomie, monoidal Differential Revision: https://phabricator.haskell.org/D573 GHC Trac Issues: #9879
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