def Lean.MVarId.constructor (mvarId : MVarId) (cfg : Meta.ApplyConfig := { }) : MetaM (List MVarId)

When the goal mvarId type is an inductive datatype, constructor calls apply with the first matching constructor.

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def Lean.MVarId.existsIntro (mvarId : MVarId) (w : Expr) : MetaM MVarId

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