std.random.unpredictableSeed currently depends on the D runtime for thread ID and timestamp but it doesn't need to.
@n8sh created dlang/phobos pull request #7408 "Fix Issue 20618 - std.random.unpredictableSeed can work in betterC" fixing this issue: - Fix Issue 20618 - std.random.unpredictableSeed can work in betterC https://github.com/dlang/phobos/pull/7408
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