http://d.puremagic.com/issues/show_bug.cgi?id=11401

           Summary: ElementType returns constructor instead of type
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: jcrapuchettes@gmail.com


--- Comment #0 from Jonathan Crapuchettes <jcrapuchettes@gmail.com> 2013-10-31 09:42:06 PDT ---
Using latest git HEAD, the following code produces an error where 2.063.2 does not. It appears to be a problem with either std.range.ElementType or std.traits.lvalueOf.

Code
---
import std.range;

void main()
{
    alias ElementType!RowRange E;
    static assert(is(typeof(E.id)), E.stringof~" is expected to have a 'id'
member");
}

struct RowRange
{
    BasicNode front()
    {
        return BasicNode.init;
    }
}

struct BasicNode { ushort id; }

Output
---
$ ~/dmd-git/build/bin/dmd serialize.d
test.d(6): Error: static assert  "BasicNode() is expected to have a 'id'
member"

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Andrei Alexandrescu <andrei@erdani.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrei@erdani.com


--- Comment #1 from Andrei Alexandrescu <andrei@erdani.com> 2013-11-03 13:44:30 PST ---
Turns out it's a compiler bug, not a library one. I reduced the code to:

struct RowRange
{
    BasicNode front()
    {
        return BasicNode.init;
    }
}

struct BasicNode { ushort id; }

void main()
{
    alias E1 = typeof(RowRange.init.front());
    static assert(is(typeof(E1.id)),
        E1.stringof~" is expected to have a 'id' member");
    alias E2 = typeof(RowRange.init.front);
    static assert(is(typeof(E2.id)),
        E2.stringof~" is expected to have a 'id' member");
}

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--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2013-11-03 18:33:49 PST ---
This is git-head only issue.

Introduced by: https://github.com/D-Programming-Language/phobos/pull/1658

(In reply to comment #1)
>     alias E1 = typeof(RowRange.init.front());
>     static assert(is(typeof(E1.id)),
>         E1.stringof~" is expected to have a 'id' member");
>     alias E2 = typeof(RowRange.init.front);
>     static assert(is(typeof(E2.id)),
>         E2.stringof~" is expected to have a 'id' member");

Currently typeof(non_property_func) returns the function type, not its return type. It is intended behavior, and this is not a compiler issue.

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid


--- Comment #3 from Kenji Hara <k.hara.pg@gmail.com> 2013-11-03 19:15:28 PST ---
https://github.com/D-Programming-Language/phobos/pull/1681

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--- Comment #4 from github-bugzilla@puremagic.com 2013-11-04 03:37:13 PST ---
Commits pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/a9eb6219b4d03ace4e6688eaeb3dfcd4f90a9faf fix Issue 11401 - ElementType returns constructor instead of type

1. For `exp.member`, compiler always try to resolve property/optional
parenthesis on `exp`. so use `front.init`.
2. Built-in `init` property always returns rvalue, so `front.init` won't invoke
postblit.

https://github.com/D-Programming-Language/phobos/commit/d743e6caa9c52e53f6bac38fb925d46b65071f78 Merge pull request #1681 from 9rnsr/fix11401

[REG2.065a] Issue 11401 - ElementType returns constructor instead of type

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Kenji Hara <k.hara.pg@gmail.com> changed:

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


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