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/ModifierCorrectionsQuickFixTest.java
buf.append("public class E extends C {\n");
		buf.append("    public void foo() {\n");
		buf.append("         fXoo= 1;\n");
		buf.append("    }\n");
		buf.append("}\n");
		ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
		
		CompilationUnit astRoot= getASTRoot(cu);
		ArrayList proposals= collectCorrections(cu, astRoot);
		assertNumberOfProposals(proposals, 5);
		assertCorrectLabels(proposals);
		
		CUCorrectionProposal proposal= (CUCorrectionProposal) proposals.get(0);
		String preview1= getPreviewContent(proposal);
		buf= new StringBuffer();
		buf.append("package test1;\n");
		buf.append("public class C {\n");
		buf.append("    protected int fXoo;\n");
		buf.append("}\n");
		String expected1= buf.toString();
		
		proposal= (CUCorrectionProposal) proposals.get(1);
		String preview2= getPreviewContent(proposal);
		buf= new StringBuffer();
		buf.append("package test1;\n");	
		buf.append("public class E extends C {\n");
		buf.append("    private int fXoo;\n");
		buf.append("\n");
		buf.append("    public void foo() {\n");
		buf.append("         fXoo= 1;\n");