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digitalmars.D.bugs - [Issue 4333] New: Cannot use tuple of local symbols in constraint nor static if

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4333

           Summary: Cannot use tuple of local symbols in constraint nor
                    static if
           Product: D
           Version: 2.041
          Platform: Other
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: rsinfu gmail.com



---
When a template is instantiated with a tuple of local symbols, using those
local symbols in template-constraint and/or static-if causes a compile error. 
See (1) and (2) below.

The error does not occur if the tuple is evaluated outside static-if scope
before used in a static if.  See (3).


(1) Using a tuple containing a local delegate literal in a template contraint
causes an error:
--------------------
template Test(a...)
    if (a.length == 1) // <-- !!
{
}
void main()
{
    alias Test!((int a) { return a; }) test;
        // Error: delegate test.__dgliteral1 cannot access frame of
        //        function __dgliteral1
}
--------------------

(2) Using the same tuple in a static if does not compile for the same error:
--------------------
template Test(a...)
{
    static if (typeof(a[0]).stringof) {} // <-- !!
}
void main()
{
    alias Test!((int a) { return a; }) test;
        // Error: delegate test.__dgliteral1 cannot access frame of
        //        function __dgliteral1
}
--------------------

(3) NOTE: The error does not occur if the tuple is evaluated outside static-if
scope before used in a static if:
--------------------
template Test(a...)
{
    alias typeof(a) at; // evaluated once (error w/o this line)
    static if (a.length == 1) {}
}
void main()
{
    alias Test!((int a) { return a; }) test; // ok
}
--------------------

(4) The error does not occur if the argument is not a tuple:
--------------------
template Test(alias a) // not tuple
{
    static if (typeof(a).stringof) {}
}
void main()
{
    alias Test!((int a) { return a; }) test; // ok
}
--------------------

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Jun 16 2010
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4333


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich gmail.com



14:13:45 PDT ---
I can't reproduce this on 2.053. Can you confirm?

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May 26 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4333


yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies gmail.com
         Resolution|                            |WORKSFORME



These all seem to work on dmd2.054

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Jul 10 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Gor Gyolchanyan <gor boloneum.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |gor boloneum.com
         Resolution|WORKSFORME                  |



---
No, it still doesn't work. I tried making a template and passing it a tuple of
mixed literals and local variable names and the same error occurred.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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 No, it still doesn't work. I tried making a template and passing it a tuple of
 mixed literals and local variable names and the same error occurred.


Please post a test case if you have one.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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---
Created an attachment (id=1014)
A struct, using which causes some problems.

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---




 No, it still doesn't work. I tried making a template and passing it a tuple of
 mixed literals and local variable names and the same error occurred.


 
 Please post a test case if you have one.


Can't reproduce that problem ATM, but another problem was discovered:

Hsec[] test(items...)()
{
    return Hsec(items);
}

unittest
{
    int i;
    float f;
    char c;

    foreach(z;  test!(5, i, 2.3f, f, 'a', c))
    {    
        writeln(z.type, " ", z.kind);
    }
}

this code causes DMD to crash.

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Jul 28 2011
prev sibling parent d-bugmail puremagic.com writes:
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klickverbot <code klickverbot.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |code klickverbot.at
         Resolution|                            |WORKSFORME



---


 Can't reproduce that problem ATM, but another problem was discovered:


Just pasting the code from the attachment and your test case works fine here
(latest DMD on OS X x86) – please provide more detailed instructions for
reproducing the problem.

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Sep 15 2011