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29 lines
812 B
Plaintext
29 lines
812 B
Plaintext
import Mathlib.Lean.Expr.Basic
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import Lean.Elab.Tactic.Basic
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/-!
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# Modified `rw`
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Modify `rw` to work like `rewrite`.
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This is mainly a copy of the implementation of `rewrite` in Lean core.
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-/
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namespace MyNat
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open Lean.Meta Lean.Elab.Tactic Lean.Parser.Tactic
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/--
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Modified `rw` tactic. For this game, `rw` works exactly like `rewrite`.
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-/
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syntax (name := rewriteSeq) "rw" (config)? rwRuleSeq (location)? : tactic
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@[tactic MyNat.rewriteSeq] def evalRewriteSeq : Tactic := fun stx => do
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let cfg ← elabRewriteConfig stx[1]
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let loc := expandOptLocation stx[3]
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withRWRulesSeq stx[0] stx[2] fun symm term => do
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withLocation loc
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(rewriteLocalDecl term symm · cfg)
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(rewriteTarget term symm cfg)
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(throwTacticEx `rewrite · "did not find instance of the pattern in the current goal")
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