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/ReturnTypeQuickFixTest.java
fJProject1= ProjectTestSetup.getProject();
		fSourceFolder= JavaProjectHelper.addSourceContainer(fJProject1, "src");
	}
	protected void tearDown() throws Exception {
		JavaProjectHelper.clear(fJProject1, ProjectTestSetup.getDefaultClasspath());
	}
	
	public void testSimpleTypeReturnDeclMissing() throws Exception {
		IPackageFragment pack1= fSourceFolder.createPackageFragment("test1", false, null);
		StringBuffer buf= new StringBuffer();
		buf.append("package test1;\n");
		buf.append("import java.util.Vector;\n");
		buf.append("public class E {\n");
		buf.append("    public foo() {\n");
		buf.append("        return (new Vector()).elements();\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, 2);
		assertCorrectLabels(proposals);
		
		boolean addReturnType= true, doRename= true;
		
		for (int i= 0; i < proposals.size(); i++) {
			Object elem= proposals.get(i);
			if (elem instanceof ASTRewriteCorrectionProposal) {
				ASTRewriteCorrectionProposal proposal= (ASTRewriteCorrectionProposal) elem;