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Update chapter-1.md #145

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11 changes: 10 additions & 1 deletion chapter-1.md
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Expand Up @@ -407,10 +407,19 @@ test "out of bounds"...index out of bounds
The user may choose to disable runtime safety for the current block by using the built-in function [`@setRuntimeSafety`](https://ziglang.org/documentation/master/#setRuntimeSafety).

```zig
const std = @import("std");
const RndGen = std.rand.DefaultPrng;

test "out of bounds, no safety" {
@setRuntimeSafety(false);
const a = [3]u8{ 1, 2, 3 };
var index: u8 = 5;

// generate an index beyond the bounds of [a] to ensure runtime evaluation
var rnd = RndGen.init(0);
const index = a.len + rnd.random().int(u8);

try expect(index >= a.len);

const b = a[index];
_ = b;
}
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