[Issue 12363] New: getProtection trait doesn't work for certain kinds of fields (and is poorly designed...)

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12363

           Summary: getProtection trait doesn't work for certain kinds of
                    fields (and is poorly designed...)
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jakobovrum at gmail.com


--- Comment #0 from Jakob Ovrum <jakobovrum at gmail.com> 2014-03-14 04:39:30 PDT ---
Example:

---
alias TemplateArgumentList(T...) = T;

struct S
{
    alias T = TemplateArgumentList!(int, float);
}

pragma(msg, __traits(getProtection, __traits(getMember, S, "T")));
---

Output:

---
test.d(8): Error: argument int has no protection
false
---

getProtection's interface is simply poorly designed. As exemplified by the
plethora of reports relating to it, it's tricky to use correctly, and as shown
above, it fails to support all kinds of symbols. The latter means this is a
bug, not an enhancement.

The interface should probably be:

__traits(getProtection, <aggregate>, <symbolName>)

Which should also succeed for inaccessible symbols. That way, both of
getProtection's problems are solved.

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