Fix Issue 23977 - [REG2.102] cannot use getSymbolsByUDA on template struct with alias member

[RazvanN7]

Need to exclude expressions when looking to get attributes.

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + phobos#8775"

[RazvanN7]

This is probably not the best idea to test if member is an expression. I took inspiration from the isExpressions template. I did not want to use it to not cause avoidable template bloat.

[RazvanN7]

I have a hard time understanding why this change causes a linker error:

generated/linux/release/64/unittest/libphobos2-ut.so: error: undefined reference to '_D11TypeInfo_BZ6__initZ'

So, there's some B symbol for which the init is not generated?

Probably a compiler bug.

[JohanEngelen]

Ping, this bug is still preventing Weka from using newer compilers. Thanks!

[LightBender]

@RazvanN7 is there anything we can do about this? Regressions are high priority and we'd like to get this fixed.