Compiler Warning C0421
Message: Use keyword EXTENDS for inheritance of interfaces instead of IMPLEMENTS
Possible error cause: An interface extends another interface, but uses the IMPLEMENTS keyword.
Error correction: Replace the IMPLEMENTS keyword with the EXTENDS keyword.
Example 475. Example of the warning
INTERFACE ITF INTERFACE ITF_1 IMPLEMENTS ITF
The declaration of the interface ITF_1 produces the following warning.
Message:
C0421: Use keyword EXTENDS for inheritance of interfaces instead of IMPLEMENTS