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Rewriting exprs the way I like in lean
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| macro "rwi" pat:term "=>" new:term ":=" prf:term : tactic => | |
| `(tactic| rewrite [let _eq : $pat = $new := $prf ; _eq ]) | |
| macro "rwi" pat:term "=>" new:term "at" loc:Lean.Parser.Tactic.locationHyp ":=" prf:term : tactic => | |
| `(tactic| rewrite [let _eq : $pat = $new := $prf ; _eq ] at $loc) |
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