[Issue 9506] New: When using alias this, writeln modifies its argument

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9506

           Summary: When using alias this, writeln modifies its argument
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: olli.pottonen at paivola.fi


--- Comment #0 from Olli Pottonen <olli.pottonen at paivola.fi> 2013-02-13 05:39:19 PST ---
The function writeln is not expected to modify its arguments, just print them.
However when a class uses alias this, writeln clears the member variable in
question.

Example:

import std.stdio;

class test {
   uint[] _p;
   alias _p this;

   this() { _p = [1, 2]; }
}

void main()
{
    test t = new test();
    writeln(t);
    writeln(t);
}

The expected output is
[1, 2]
[1, 2]
but instead the program outputs
[1, 2]
[]

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