[Issue 19829] __traits(isSame) returns true for some non-local delegate lambdas even when they are different

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19829

--- Comment #3 from Simen Kjaeraas <simen.kjaras at gmail.com> ---
Not really - lambda comparison was implemented in 2.079. Before that any
comparison of lambdas with isSame would return false.

Anyways, the core issue is `x` doesn't impact the serialization of lambdas,
while it should render the lambda incomparable. Fixed here:
https://github.com/dlang/dmd/pull/9710

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