methods: The compiler has detected that PParent points to an object which has an abstract method. Commenting line 3 would allow compilation of the program. Remark If an abstract method is overridden, the

This i s harmless before IO has begun } { Try t h i s program again on a big f i l e , a f t e r commenting out the f o l l o w i n g 2 l i n e s and recompiling i t . } SetTextBuf ( Fin , Bufin ) ; SetTextBuf