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digitalmars.D.bugs - [Issue 3187] New: Nested foreach over opApply doesn't work

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3187

           Summary: Nested foreach over opApply doesn't work
           Product: D
           Version: unspecified
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: johnch_atms hotmail.com


Calling nested foreach statements on types that implement opApply causes an
error. There appears to be a bug in the code generated by the compiler.

class Collection {
  int opApply(int delegate(ref Object) a) {
    return 0;
  }
}

Object testForeach(Collection level1, Collection level2) {
  foreach (first; level1) {
    foreach (second; level2)
      return second;
  }
  return null;
}

void main() {
  testForeach(new Collection, new Collection);
}

Error: cannot implicitly convert expression (second) of type object.Object to
int

This is the code DMD generates for the testForeach method, with the problem
line highlighted:

Object testForeach(Collection level1, Collection level2) {
   switch(level1.opApply(delegate (Object __applyArg0) {
     {
       Object first = __applyArg0;
       switch(level2.opApply(delegate (Object __applyArg0) {
         {
           Object second = __applyArg0;
           {
// ********* HERE'S THE PROBLEM *********
             __result = cast(Object) cast(int) second;
             return 2;
           }
         }
         return 0;
       } )) {
         default:
         break;
         case 2:
           __result = __result;
           return 2;
       }
     }
     return 0;
   } )) {
     default:
     break;
     case 2:
       return __result;
   }
   return cast(Object) null;
}

This problem occurs with both DMD 1.x and 2.x compilers.

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Jul 17 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3187


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|wrong-code                  |ice-on-valid-code



I'm changing this from wrong-code to ICE, since it never reaches code
generation.

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Aug 06 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3187


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|ice-on-valid-code           |diagnostic, rejects-valid




 I'm changing this from wrong-code to ICE, since it never reaches code
 generation.
Actually although the compiler fouls this up badly, it isn't an ICE. It's a rejects-valid with a really bad diagnostic. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Feb 15 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3187


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch



https://github.com/D-Programming-Language/dmd/pull/546

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Dec 01 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED



18:42:37 PST ---
https://github.com/D-Programming-Language/dmd/commit/514e1fa711a5774bf7c393772cd8489b2af2534e

https://github.com/D-Programming-Language/dmd/commit/d124949381400582b5d6a6c5015bf42483afa54d

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Dec 14 2011
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3187


yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cbkbbejeap mailinator.com



*** Issue 2192 has been marked as a duplicate of this issue. ***

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Feb 03 2012