Why this code doesn't compile?

[1q5xaaqz]

{$macro on}

{$define TIMEOUT_INFINITE:= dword(-1)}

The error is fatal syntax error: "identifier" expected but found "-"

[Thaddy]

Code: Pascal  [Select][+][-]

1. {$macro on}
2. {$define TIMEOUT_INFINITE:= high(dword)}
3. begin
4.   writeln(longint(TIMEOUT_INFINITE)); // -1 if you back cast it and proof the macro is now correct.
5. end.

[1q5xaaqz]

Thank you.