[Issue 4685] New: in contract of base class affected by the body of the overriding function

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4685

           Summary: in contract of base class affected by the body of the
                    overriding function
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2010-08-19 17:39:30 PDT ---
This code is normal:

import std.conv;

class BasicDate
{
    string format(string spec)
    in
    {
        writeln("in basicdate.format contract");
        writeln(spec);
        assert(spec == "1234");
    }
    body
    {
        return "";
    }
}

class Date : BasicDate
{
    override string format(string spec)
    in  
    {
        writeln("in date.format contract");
        writeln(spec);
        assert(spec == "1234");
    }
    body
    {
        //~ string x;
        return "";
    }
}

import std.stdio;

unittest
{
    auto mydate = new Date;
    mydate.format("1234");
}

void main()
{
}

Prints:
in basicdate.format contract
1234

Now I uncomment the "string x" line in the overriding function:

import std.conv;

class BasicDate
{
    string format(string spec)
    in
    {
        writeln("in basicdate.format contract");
        writeln(spec);
        assert(spec == "1234");
    }
    body
    {
        return "";
    }
}

class Date : BasicDate
{
    override string format(string spec)
    in  
    {
        writeln("in date.format contract");
        writeln(spec);
        assert(spec == "1234");
    }
    body
    {
        string x;
        return "";
    }
}

import std.stdio;

unittest
{
    auto mydate = new Date;
    mydate.format("1234");
}

void main()
{
}

Prints:
in basicdate.format contract
(null)
in date.format contract
1234

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