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This PR introduces the let tactic, which allows you to bind variables in tactic metaprograms. It takes a variadic number of binder names, and produces a hole for each, in order.

Fixes #2002

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@jneira jneira left a comment

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we were missing you 😉

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I've been on a nice vacation in Mexico :) Back in full force soon.

@isovector isovector added the merge me Label to trigger pull request merge label Sep 5, 2021
@mergify mergify bot merged commit 10a0edb into haskell:master Sep 6, 2021
July541 pushed a commit to July541/haskell-language-server that referenced this pull request Sep 6, 2021
* Add metatactic for let-bindings

* Add test for simple let bindings

* Label hole numbers in the documentation

* Sort imports

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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Wingman feature request: Support for tactic subgoals via let
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