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Lean.Meta.Match.CaseArraySizes

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    def Lean.Meta.caseArraySizes (mvarId : Lean.MVarId) (fvarId : Lean.FVarId) (sizes : Array Nat) (xNamePrefix : Lean.Name := `x) (hNamePrefix : Lean.Name := `h) :

    Split goal ... |- C a into sizes.size + 1 subgoals

    1. ..., x_1 ... x_{sizes[0]} |- C #[x_1, ... x_{sizes[0]}] ... n) ..., x_1 ... x_{sizes[n-1]} |- C #[x_1, ..., x_{sizes[n-1]}] n+1) ..., (h_1 : a.size != sizes[0]), ..., (h_n : a.size != sizes[n-1]) |- C a where n = sizes.size
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