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Ticket #17590 pointed out a bug in the way the linter dealt with type lets, exposed by the new uniqAway story. The fix is described in Note [Linting type lets]. I ended up putting the in-scope Ids in a different env field, le_ids, rather than (as before) sneaking them into the TCvSubst. Surprisingly tiresome, but done. Metric Decrease: hie002
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