111     function IsNil(const Tree: IANTLRInterface): Boolean;
504     property IsNil: Boolean read GetIsNil;  property
1276     function IsNil(const Tree: IANTLRInterface): Boolean; virtual;  in IsNil()  function
2141   if ChildTree.IsNil then // t is an empty node possibly with children
2294   if (NewTree.IsNil) then
2389   if T.IsNil then
2697     if (NewRootTree.IsNil) then
2835 function TBaseTreeAdaptor.IsNil(const Tree: IANTLRInterface): Boolean;  in IsNil()  function
2837   Result := (Tree as ITree).IsNil;
2846   if Assigned(R) and (R.IsNil) then
3087   IsNil: Boolean;
3090   IsNil := FAdaptor.IsNil(T);
3091   if (not IsNil) then
3096   if (not IsNil) and (N > 0) then
3104   if (not IsNil) and (N > 0) then
4048   if (TreePattern = nil) or (TreePattern.IsNil)
4124   if (TreePattern = nil) or (TreePattern.IsNil)
4635   if (FAdaptor.IsNil(Result)) then
4865   if (not FAdaptor.IsNil(P)) then
4877   if (N > 0) and (not FAdaptor.IsNil(P)) then
4886   if (N > 0) and (not FAdaptor.IsNil(P)) then
4900   if (Child = 0) and (not FAdaptor.IsNil(FCurrentNode)) then
4923       if (not FAdaptor.IsNil(FCurrentNode)) then