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long fact(in long x) pure nothrow @nogc {
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long result = 1;
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foreach (immutable i; 2 .. x + 1)
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result *= i;
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return result;
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}
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void main() {
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// enum means "compile-time constant", it forces CTFE.
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enum fact10 = fact(10);
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import core.stdc.stdio;
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printf("%ld\n", fact10);
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}
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