bug#23781: 25.0.95; read-string with HIST lexically bound

[Drew Adams]

> > AFAICT this is expected and not specific to `read-string': A quoted
> > symbol can never refer to a lexical binding - and `symbol-value' or
> > `eval' always return the dynamic binding.
> 
> Right, it's sort of hinted at in the elisp manual (11.9.3 Lexical Binding):
> 
>     Note that functions like ‘symbol-value’, ‘boundp’, and ‘set’ only
>     retrieve or modify a variable’s dynamic binding (i.e., the
>     contents of its symbol’s value cell).
> 
> I think we should be a little more specific, not
> just give examples, something like:
> 
>     Note that functions which take a symbol argument (like
>     ‘symbol-value’, ‘boundp’, and ‘set’) can only retrieve or modify a
>     variable’s dynamic binding (i.e., the contents of its symbol’s
>     value cell).
> 
> Sort of releated: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21185

Be even more specific: A Lisp symbol is a dynamic thing.
It is an object.  Lexical binding has nothing to do with symbols.
A given _name_ in code can sometimes be lexically bound.