[Issue 17973] New: getSymbolsByUDA deprecation message: symbol not visible from std.traits

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17973

          Issue ID: 17973
           Summary: getSymbolsByUDA deprecation message: symbol not
                    visible from std.traits
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: zorael at gmail.com

Arch linux amd64, tested on dmd 2.077.0 and LDC 1.5.0 (based on 2.075.1).

Related: https://issues.dlang.org/show_bug.cgi?id=15907

Using getSymbolsByUDA in a context where it ends up looking at private symbols
gives a deprecation message, the same as in the bug linked above. This includes
private symbols in the current module.

alphaglosined in #d did not consider it to be a bug (though based on a more
elaborate example using mixins), so this may be intended behaviour.

> alphaglosined | you can create an issue if you want, my intearpretation suggests that it is working correctly
> alphaglosined | the work done on visibility checking for traits isn't very old, so there could be some bugs in there that I haven't considered ;)
> B4S1L3 | ideally protection should be bypassed for most of the __traits() and people should use getProtection and decide to follow the protection attribs seamnatic or not.

Heavily reduced:

------------------------------
module app;
import std.traits;

private:

@SomeUDA
void foo() {}

public:

struct SomeUDA {}

void main()
{
    foreach (member; getSymbolsByUDA!(app, SomeUDA)) {}  // current module
}
-----------------------------

/usr/include/dlang/dmd/std/traits.d-mixin-7761(7761,19): Deprecation: app.foo
is not visible from module traits

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