lean4-htt/tests/lean/run/letMVar.lean
2021-10-02 16:12:50 -07:00

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def tst (x : Nat) : Nat :=
let_mvar% ?m := x + 1;
?m + ?m
#print tst
example : tst x = (x + 1) + (x + 1) :=
rfl