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digitalmars.D.bugs - [Issue 7249] New: 2.058 regression: "no size yet for forward reference" when using this.init.tupleof

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7249

           Summary: 2.058 regression: "no size yet for forward reference"
                    when using this.init.tupleof
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: thecybershadow gmail.com


--- Comment #0 from Vladimir Panteleev <thecybershadow gmail.com> 2012-01-08
10:09:34 PST ---
struct S
{
    int x;
    alias typeof(this.init.tupleof[0]) T;
}

This worked in 2.057, but doesn't work in DMD git head.

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--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2012-01-08 15:05:22 PST ---
This causes by fixing bug 7190.

I think this is similar problem like follows:

struct S
{
    int x;
    alias typeof(this.init.sizeof) T;
    //  Error: struct test.S no size yet for forward reference
}

tupleof property requires complete semantic analysis to get the fields of a
type.
So it is meaningful forward reference, IMHO.

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--- Comment #2 from Vladimir Panteleev <thecybershadow gmail.com> 2012-01-08
15:11:53 PST ---
In my case, the list of fields is passed as a template parameter:

struct S(string FIELDS)
{
    mixin(FIELDS);

    alias typeof(Fields.init.tupleof[0]) TypeOfFirstField;
}

There is a simple workaround available:

    struct Fields { mixin(FIELDS); }
    alias typeof(Fields.init.tupleof[0]) TypeOfFirstField;

So, if you think this is not a bug, I'm not against this change.

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--- Comment #3 from Vladimir Panteleev <thecybershadow gmail.com> 2012-01-08
15:15:23 PST ---
(In reply to comment #2)

 In my case, the list of fields is passed as a template parameter:
 
 struct S(string FIELDS)
 {
     mixin(FIELDS);
 
     alias typeof(Fields.init.tupleof[0]) TypeOfFirstField;


Oops, last line should be:
      alias typeof(this.init.tupleof[0]) TypeOfFirstField;

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--- Comment #4 from Kenji Hara <k.hara.pg gmail.com> 2012-01-08 15:25:00 PST ---
(In reply to comment #2)

 So, if you think this is not a bug, I'm not against this change.


Yes, I think this is not a bug.

Additionally, old behavior had a order dependent problem.

struct S
{
    alias typeof(this.init.tupleof[0]) T;
    // Error: array index [0] is outside array bounds [0 .. 0]
    // -> tupleof result was empty

    int x;

    alias typeof(this.init.tupleof[0]) T;
    // OK, T == int
}

Now they raise forward reference error as a same.
I think it's better consistency.

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Vladimir Panteleev <thecybershadow gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #5 from Vladimir Panteleev <thecybershadow gmail.com> 2012-01-08
15:26:02 PST ---
OK, thanks for looking into this.

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