Add test for Forth that an operator can be overridden.
Add test for Forth that an operator can be overridden.

rpottsoh/x-common,rpottsoh/x-common,petertseng/x-common,exercism/x-common,Vankog/problem-specifications,ErikSchierboom/x-common,Vankog/problem-specifications,petertseng/x-common,exercism/x-common,ErikSchierboom/x-common,jmluy/x-common,jmluy/x-common,jmluy/x-common