29 lines
626 B
Text
29 lines
626 B
Text
--
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def f1 (x : Nat) (b : Bool) : type_of% x :=
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let r : type_of% (x+1) := x+1;
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r + 1
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theorem ex1 : f1 1 true = 3 :=
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rfl
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def f2 (x : Nat) (b : Bool) : type_of% x :=
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let r : type_of% b := x+1; -- error
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r + 1
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def f3 (x : Nat) (b : Bool) : type_of% b :=
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let r (x!1 : type_of% x) : type_of% b := x > 1;
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r x
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def f4 (x : Nat) : Nat :=
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let y : Nat := x
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let y := ensure_type_of% y "invalid reassignment, term" y == 1 -- error
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y + 1
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def f5 (x : Nat) : Nat :=
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let y : Nat := x
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let y := ensure_type_of% y "invalid reassignment, term" (y+1)
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y + 1
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def f6 (x : Nat) : Nat :=
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ensure_expected_type% "natural number expected, value" true
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