JSType type = lazyExprRegistry.createFromTypeNodes(
expr, "source.js", empty);
assertTrue(type instanceof UnresolvedTypeExpression);
assertTrue(type.isUnknownType());
assertEquals("?", type.toString());
assertNull("Unexpected warnings: " + reporter.warnings(),
reporter.warnings());
type = lazyNameRegistry.createFromTypeNodes(
expr, "source.js", empty);
assertTrue(type instanceof UnionType);