Bug 76530 [options] Warn about unused local variables and private members
I think we should warn about unused local variables and unused private members by default. These things are errors akin to unused imports, which we already warn about.
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/quickfix/AssistQuickFixTest.java
buf.append("    boolean equals(int i) {\n");
        buf.append("        return false;\n");
        buf.append("    }\n");  
        buf.append("    public void foo() {\n");        
        buf.append("        new E().equals(1 + 1);\n");
        buf.append("    }\n");
        buf.append("}\n");
        ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
        
        String str= "E().equals";
        AssistContext context= getCorrectionContext(cu, buf.toString().indexOf(str) + str.length(), 0);
        List proposals= collectAssists(context, FILTER_EQ);
        
        assertNumberOfProposals(proposals, 0);
        assertCorrectLabels(proposals);
        
        context= getCorrectionContext(cu, buf.toString().lastIndexOf(str), 0);
        proposals= collectAssists(context, FILTER_EQ);
        
        assertNumberOfProposals(proposals, 0);
        assertCorrectLabels(proposals);
    }
    
    public void testInvertEquals16() throws Exception {
        IPackageFragment pack1= fSourceFolder.createPackageFragment("test1", false, null);
        StringBuffer buf= new StringBuffer();
        buf.append("package test1;\n");
        buf.append("public class E {\n");
        buf.append("    boolean equals(int i) {\n");
        buf.append("        return false;\n");