CachedClassLoader newLoader = getAndRetainLoader(spec, id, factoryFunction);
                byId.put(id, newLoader);

                if (cachedLoader != null) {
                    LOGGER.debug("Releasing previous classloader for {}", id);
                    cachedLoader.release(id);
                }
                return newLoader.classLoader;
            } else {

    }

    private Loader storeIfAbsent(ProtectionDomain domain, Loader newLoader) {
        Loader oldLoader = loaders.putIfAbsent(domain, newLoader);
        if (oldLoader != null) {
            // Discard the new loader, someone beat us with storing it.
            IoActions.closeQuietly(newLoader);
            return oldLoader;
        }
        return newLoader;
    }

    @Override
    public void close() {

         * Finalizer.class -> CustomClassLoader -> CustomClassLoader.class -> This class loader
         *
         * System class loader will (and must) be the parent.
         */
        ClassLoader finalizerLoader = newLoader(getBaseUrl());
        return finalizerLoader.loadClass(FINALIZER_CLASS_NAME);
      } catch (Exception e) {
        logger.log(Level.WARNING, LOADING_ERROR, e);
        return null;
      }
    }

         * Finalizer.class -> CustomClassLoader -> CustomClassLoader.class -> This class loader
         *
         * System class loader will (and must) be the parent.
         */
        ClassLoader finalizerLoader = newLoader(getBaseUrl());
        return finalizerLoader.loadClass(FINALIZER_CLASS_NAME);
      } catch (Exception e) {
        logger.log(Level.WARNING, LOADING_ERROR, e);
        return null;
      }
    }

	idx := uint32(len(ldr.objSyms))
	st := loadState{l: ldr}
	return st.addSym(name, 0, or, idx, nonPkgDef, &goobj.Sym{})
}

func mkLoader() *Loader {
	er := ErrorReporter{}
	ldr := NewLoader(0, &er)
	er.ldr = ldr
	return ldr
}

func TestAddMaterializedSymbol(t *testing.T) {
	ldr := mkLoader()
	dummyOreader := oReader{version: -1, syms: make([]Sym, 100)}
	or := &dummyOreader