// that contains a zip file bigger.zip that contains a zip file
// big.zip that contains big.file, which contains 2³²-1 zeros.
// The big.zip file is interesting because it has no zip64 header,
// much like the innermost zip files in the well-known 42.zip.
//
// biggest.zip was generated by changing isZip64 to use > uint32max
// instead of >= uint32max and then running this program:
//

			return false
		}
		// We can't figure out the type. Conservative
		// approach is to assume it has a pointer.
		return true
	case *ast.SelectorExpr:
		if l, ok := t.X.(*ast.Ident); !ok || l.Name != "C" {
			// Type defined in a different package.
			// Conservative approach is to assume it has a
			// pointer.
			return true
		}
		if f == nil {
			// Conservative approach: assume pointer.