Why does javac complain about generics unrelated to the class' type arguments? [duplicate]

From JLS 4.8 Raw Types

The use of raw types is allowed only as a concession to compatibility of legacy code. The use of raw types in code written after the introduction of generics into the Java programming language is strongly discouraged.

and

The type of a constructor (§8.8), instance method (§8.4, §9.4), or non-static field (§8.3) M of a raw type C that is not inherited from its superclasses or superinterfaces is the raw type that corresponds to the erasure of its type in the generic declaration corresponding to C.

Which - if you read it carefully - implies that all types are erased, not just the type you left out.