code: final public SetExpressionBuilder<T> set(final String to) {
      final int sourceLineNumber = builder.getSourceLineNumber();
      return new SetExpressionBuilder<T>(new ExpressionHandler<T>() {
        public T handleExpression(Expression e) {
          return statementHandler().handleStatement(new SetStatement(sourceLineNumber, to, e));
        }
      });
    }
docs: set(varName).{expression}.endSet()
  @return an expression builder