fn testSentinel() !void 130
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140fn testSentinel() !void {
try testing.expectEqual(@as(u8, 0), sentinel([:0]u8).?);
try testing.expectEqual(@as(u8, 0), sentinel([*:0]u8).?);
try testing.expectEqual(@as(u8, 0), sentinel([5:0]u8).?);
try testing.expectEqual(@as(u8, 0), sentinel(*const [5:0]u8).?);
try testing.expect(sentinel([]u8) == null);
try testing.expect(sentinel([*]u8) == null);
try testing.expect(sentinel([5]u8) == null);
try testing.expect(sentinel(*const [5]u8) == null);
}