[Issue 20717] Unsilenced bogus "undefined identifier" error from speculative collision

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20717

--- Comment #6 from Basile-z <b2.temp at gmx.com> ---
Ok I've find what really happens. When you merge the two tests in a single
module, so the one reported here and the one here
https://github.com/dlang/dmd/pull/10078/files#diff-b33aefca6dc2d2014d789a2d8727fb1eR1,
then this compiles because symbols are solved differently.

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