A DESCRIPTION OF THE PROBLEM :
javac compiles the code below instead of rejecting it. I've tested all major versions starting from 1.8 up to 11-ea-14. The problem starts at http://hg.openjdk.java.net/jdk/jdk/file/7a7285477153/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java#l3119 , and later checks don't reject such qualified identifiers if they refer to an entity having the expected type ("C.c" field in my example).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
javac C.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A compilation error, e.g.:

C.java:3: error: ')' expected
    void foo(C c.c) {
                ^

ACTUAL -
Compilation succeeds.

---------- BEGIN SOURCE ----------
class C {
    C c;
    void foo(C c.c) {
    }
}

---------- END SOURCE ----------