strange error

[Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum]

The type isn't illegal.

Pike v7.6 release 112 running Hilfe v3.5 (Incremental Pike Frontend)
> 1[""];
Indexing the integer 1 with unknown method "".
HilfeInput:1: HilfeInput()->___HilfeWrapper()
> 1["sgn"]();
(1) Result: 1
>

But the error in your example seems wrong, yes.