lean2/tests/lean/run/sec_notation.lean

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open nat
section
parameter (A : Type)
definition f (a b : A) : A := a
definition add2 (a : nat) : nat := a + 2
postfix `+.2`:100 := add2
eval 3 +.2
end
example : 3 +.2 = 5 :=
rfl