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Piyush P. Kurur authored
Backpack is unable to type check signatures that expect a data which is a type level literal. This was reported in issue #15138. These commits are a fix for this. It also includes a minimal test case that was mentioned in the issue. Reviewers: bgamari, ezyang, goldfire Reviewed By: bgamari, ezyang Subscribers: simonpj, ezyang, rwbarton, thomie, carter GHC Trac Issues: #15138 Differential Revision: https://phabricator.haskell.org/D4951
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