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Lean.Meta.Tactic.UnifyEq

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    Helper method for methods such as Cases.unifyEqs?. Given the given goal mvarId containing the local hypothesis eqFVarId, it performs the following operations:

    • If eqFVarId is a heterogeneous equality, tries to convert it to a homogeneous one.
    • If eqFVarId is a homogeneous equality of the form a = b, it tries
      • If a and b are definitionally equal, clear it
      • Normalize a and b using the current reducibility setting.
      • If a (b) is a free variable not occurring in b (a), replace it everywhere.
      • If a and b are distinct constructors, return none to indicate that the goal has been closed.
      • If a and b are the same constructor, apply injection, the result contains the number of new equalities introduced in the goal.
      • It also tries to apply the given acyclic method to try to close the goal. Remark: It is a parameter because simp uses unifyEq?, and acyclic depends on simp.
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