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Summary: `collectLStmtsBinders` was returning nothing for `ApplicativeStmts`, which caused the debugger to not track free variables in many cases when using `ApplicativeDo`. Test Plan: * new test case * validate Reviewers: bgamari, erikd Reviewed By: bgamari Subscribers: rwbarton, thomie, carter GHC Trac Issues: #15422 Differential Revision: https://phabricator.haskell.org/D4991
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