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
IPackageFragment pack1= fSourceFolder.createPackageFragment("test1", false, null);
		StringBuffer buf= new StringBuffer();
		buf.append("package test1;\n");
		buf.append("public class E {\n");
		buf.append("\n");
		buf.append("    private int f;\n");
		buf.append("\n");
		buf.append("    public void foo() {\n");
		buf.append("        Math.min(1.0f, 2.0f);\n");
		buf.append("    }\n");
		buf.append("}\n");
		ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
				
		int offset= buf.toString().indexOf("Math");
		AssistContext context= getCorrectionContext(cu, offset, 0);
		List proposals= collectAssists(context, false);
		
		assertNumberOfProposals(proposals, 2);
		assertCorrectLabels(proposals);
		
		CUCorrectionProposal proposal= (CUCorrectionProposal) proposals.get(0);
		String preview1= getPreviewContent(proposal);
		buf= new StringBuffer();
		buf.append("package test1;\n");
		buf.append("public class E {\n");
		buf.append("\n");
		buf.append("    private int f;\n");
		buf.append("    private float g;\n");
		buf.append("\n");				
		buf.append("    public void foo() {\n");