While statements

For a while statement stmt of the form: while (expr) while-body v has the same definite assignment state at the beginning of expr as at the beginning of stmt. If v is definitely assigned at the end of expr, then it is definitely assigned on the control flow transfer to while-body and to the end point of stmt. If v has the state "definitely assigned after true expression" at the end of expr, then it is definitely assigned on the control flow transfer to while-body, but not definitely assigned at the end-point of stmt. If v has the state "definitely assigned after false expression" at the end of expr, then it is definitely assigned on the control flow transfer to the end point of stmt.