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digitalmars.D.bugs - [Issue 8192] New: inconsistent behavior of initialized immutable instance fields

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8192

           Summary: inconsistent behavior of initialized immutable
                    instance fields
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: timon.gehr gmx.ch


--- Comment #0 from timon.gehr gmx.ch 2012-06-03 10:19:14 PDT ---
DMD 2.059:

struct S{ immutable y = 1; }
void main(){
    writeln(S.y);       // ok
    writeln(&S.y);      // error
    with(S){
        writeln(&y);    // ok  
        assert(*&y==y); // fail
    }
}

Either the code should run through or all the commented lines should fail to
compile.

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8192



--- Comment #1 from timon.gehr gmx.ch 2012-06-03 10:23:29 PDT ---
Better test case:

struct S{ immutable y = 1; }
void main(){
    assert(S.y==1);       // ok
    assert(&S.y!is null); // compile error
    with(S){
        assert(&y!is null); // ok
        assert(*&y==y);     // fail
    }
}

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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art.08.09 gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |art.08.09 gmail.com


--- Comment #2 from art.08.09 gmail.com 2012-06-03 12:09:51 PDT ---
Worse, the struct layout changes when an immutable field has an initializer.

   struct S  { immutable int x = 1; int y; }
   struct S2 { int x;               int y; }

   void main(){
      S s;
      S2 s2;
      static assert(s.y.offsetof==s2.y.offsetof); // fails
   }

Trying to take the address of s.x fails with 'not an lvalue', etc.

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--- Comment #3 from art.08.09 gmail.com 2012-06-03 12:25:49 PDT ---
A better example:

   struct S  { immutable int x = 1; int y; }
   struct S2 { immutable int x;     int y; }

   void main(){
      S s;
      S2 s2;
      static assert(s.y.offsetof==s2.y.offsetof); // fails
    }

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prev sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |DUPLICATE


--- Comment #4 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2012-12-26
16:03:42 PST ---
Another case of Issue 3449 methinks.

*** This issue has been marked as a duplicate of issue 3449 ***

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