Fix issue 21296 - std.variant.Variant cannot be initialized with immu… #7652
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…table AA
The source of this issue is that the private static method
Variant.handler.tryPuttingaccidentally generate a code foropIndexAssignto immutable AA in compile time.This request fixes this issue by making
tryPuttingthrowing an exception in runtime for such cases.I also confirmed that Issue 13930 (std.concurrency can't send immutable AA) is also solved by this change.
It might be possible to add a test for issue 13930 but unfortunately there still remains an issue in receiving side (not yet filed).