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def Mathlib.Tactic.renameArg : Lean.ParserDescr

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def Mathlib.Tactic.rename' : Lean.ParserDescr

rename' h => hnew renames the hypothesis named h to hnew. To rename several hypothesis, use rename' h₁ => h₁new, h₂ => h₂new. You can use rename' a => b, b => a to swap two variables.

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