Under certain circumstances, because of what I assume is a bug in my code, I 
get an error like this:

> define-values: assignment disallowed;
>  cannot re-define a constant
>   constant: lang:read.1
>   in module: "/Users/mb/git/racket/racket/collects/racket/main.rkt"
>   context...:
>    (submod /Users/mb/git/racket/racket/collects/racket/main.rkt reader): 
> [running body]

I understand how the "assignment disallowed" error arises. What I don't 
understand is the meaning of "lang:read.1" in this context. I'm guessing it has 
something to do with the #lang line (?) but ... the rest is hazy. 

Clarification welcome.
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