The following program doesn't compile:

public interface OutSideInterface
{
  public interface InsideInterface
  {
    void m(int p, int p2);
  };
}

Note the empty statement (semicolon) on line 6.
This is legal (jikes accepts it) but deprecated.

Compiling with -C gives:

OutSideInterface.java:6: error: '{' expected.
     };
      ^
OutSideInterface.java:7: error: Class or interface declaration expected.
   }
   ^
2 errors

Reported by Jerry Haltom.


With -Wextraneous-semicolon the compiler does see that this is just an 
declaration:

OutSideInterface.java:6: warning: An empty declaration is a deprecated feature
that should not be used.

-- 
           Summary: Empty declaration through semicolon (;) causes compile
                    failure
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mark at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19674

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