• via Digitalmars-d-bugs (41/41) Jun 04 2016 https://issues.dlang.org/show_bug.cgi?id=16123

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=16123

          Issue ID: 16123
           Summary: alias member of member
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: schveiguy yahoo.com

Currently, you can alias a member of your struct no problem:

struct S
{
   int x;
   alias y = x;
}

If I want to alias a member of a member, it does not work:

struct T
{
   S s;
   alias y = s.x; // note, this compiles just fine, you need to use it to flag
the error.
}

void main()
{
   T t;
   t.s.y = 5; // ok
   t.y = 5; // Error: need 'this' for 'x' of type 'int'
}

To me, this doesn't make sense. The requirements shouldn't be any different, if
I can alias a member, I should be able to alias a member's member, especially
if the member is a field.

I'm not sure if this is an enhancement or a bug. Flagging as bug, change if
necessary.

Note, in older versions of the compiler (2.069 and earlier), I get an
additional error:

Error: struct testalias.T 'x' is not a member

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