protected internal override void CheckSemantics(AstHelper astHelper)
{
base.CheckSemantics(astHelper);
_breakLabel = MAst.Label();
_continueLabel = MAst.Label();
Test.CheckSemantics(astHelper);
AstHelper child = astHelper.CreateChild(loop: true, breakLabel: _breakLabel, continueLabel: _continueLabel);
Body.CheckSemantics(child);
astHelper.Errors.Check(new WhileBodyReturnsValueError(Body.Type, Start));
}