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= new StringBuffer();
			buf.append("package test1;\n");
			buf.append("public interface IB<T> {\n");
			buf.append("}\n");
			pack1.createCompilationUnit("IB.java", buf.toString(), false, null);
			
			buf= new StringBuffer();
			buf.append("package test1;\n");
			buf.append("import java.io.IOException;\n");
			buf.append("import java.util.Vector;\n");
			buf.append("public class E extends A<String> implements IB<String> {\n");
			buf.append("    public Vector<String> foo(int count) throws IOException {\n");
			buf.append("        return null;\n");
			buf.append("    }\n");
			buf.append("}\n");
			ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
			
			String str= "foo";
			AssistContext context= getCorrectionContext(cu, buf.toString().indexOf(str) + str.length(), 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("\n");
			buf.append("import java.io.IOException;\n");