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/core/ScopeAnalyzerTest.java
public void testVariableDeclarations4() throws Exception {
		IPackageFragment pack0= fSourceFolder.createPackageFragment("pack1", false, null);
		StringBuffer buf= new StringBuffer();
		buf.append("package pack1;\n");
		buf.append("\n");
		buf.append("public class Rectangle {\n");
		buf.append("  public int x;\n");
		buf.append("  public int y;\n");
		buf.append("}\n");
		pack0.createCompilationUnit("Rectangle.java", buf.toString(), false, null);
		
		IPackageFragment pack1= fSourceFolder.createPackageFragment("test1.ae", false, null);
		buf= new StringBuffer();
		buf.append("package test1.ae;\n");
		buf.append("import pack1.Rectangle;\n");
		buf.append("public class E {\n");
		buf.append("    private int fVar1, fVar2;\n");
		buf.append("    public int goo(int param1) {\n");
		buf.append("        int k= 0;\n");
		buf.append("        Rectangle r= new Rectangle();\n");		
		buf.append("        return r.x;\n");
		buf.append("    }\n");			
		buf.append("}\n");
		ICompilationUnit compilationUnit= pack1.createCompilationUnit("E.java", buf.toString(), false, null);		
		
		CompilationUnit astRoot= createAST(compilationUnit);
		assertNoProblems(astRoot);
		{
			String str= "return r.x;";
			int offset= buf.toString().indexOf(str) + "return r.".length();