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Assignment operator must return a value.
Trying to compile this code using VC++ or Comeau C/C++:

struct A
{
   A& operator=(A const& rhs)
   {
   }
};

I get this error:

MODE:strict errors C++

"ComeauTest.c", line 5: warning: missing return statement
at end of non-void function
"A::operator=" 
}
^

This is ISO C++ conformant behaviour.

There are many assignment operators defined as not
returning any value. This is a bug!