• d-bugmail puremagic.com Jan 19 2010

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=3722

           Summary: A method without an in contract should always succeed,
                    even if overridden
           Product: D
           Version: 2.039
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: kiki kmonos.net


--- Comment #0 from Kazuhiro Inaba <kiki kmonos.net> 2010-01-19 01:25:04 PST ---
In dmd 2.039, the following code fails to pass the in-contract.

class Base
{
   void method() {}
}

class Derived : Base
{
   void method() in { assert(false); } body {}
}

void main()
{
   Base b = new Derived;
   b.method();
}

But, according to the spec, IIUC, it should successfully pass the check.

 A function without an in contract means that any values of the function
parameters are allowed. This implies that if any function in an inheritance
hierarchy has no in contract, then in contracts on functions overriding it have
no useful effect.


If I add an explicit empty in-contract to Base.method:
  void method() in{} body{}
then it passes the check.

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