The rename_bvar tactic

This file defines the rename_bvar tactic, for renaming bound variables.

def Mathlib.Tactic.renameBVarHyp (mvarId : Lean.MVarId) (fvarId : Lean.FVarId) (old new : Lean.Name) : Lean.MetaM Unit

Renames a bound variable in a hypothesis.

def Mathlib.Tactic.renameBVarTarget (mvarId : Lean.MVarId) (old new : Lean.Name) : Lean.MetaM Unit

Renames a bound variable in the target.

def Mathlib.Tactic.«tacticRename_bvar_→__» : Lean.ParserDescr

• rename_bvar old → new renames all bound variables named old to new in the target.
• rename_bvar old → new at h does the same in hypothesis h.

example (P : ℕ → ℕ → Prop) (h : ∀ n, ∃ m, P n m) : ∀ l, ∃ m, P l m := by
  rename_bvar n → q at h -- h is now ∀ (q : ℕ), ∃ (m : ℕ), P q m,
  rename_bvar m → n -- target is now ∀ (l : ℕ), ∃ (n : ℕ), P k n,
  exact h -- Lean does not care about those bound variable names

Note: name clashes are resolved automatically.