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procedure {:checksum "-1"} Foo(b: bool);
implementation {:id "Foo"} {:checksum "2"} Foo(b: bool)
{
var r: int;
assert b;
call r := Sum(42);
assert r != 0;
assert r == (42 * 43) div 2;
}
procedure {:checksum "3"} Sum(n: int) returns (r: int);
requires 0 <= n;
ensures r == (n * (n + 1)) div 2;
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