Re: master f51f963: Fix some side-effecting uses of make-text-button

[Stefan Monnier]

>> That makes me think there's been a fairly concrete proposal that has
>> been made and which I missed (since otherwise, it seems unclear how
>> you'd get to these conclusions).  Can someone point me to it?
> There's no concrete proposal yet, in terms of published code. That being said,
> my idea is to change the Elisp interpreter to distinguish constant from 
> mutable
> strings, and to have a runtime check in the few primitives (notably aset) that
> modify strings.

Right, this loos like the easy part.

> String literals yield constant strings when evaluated.

This seems less obvious.  How do you do that?

[ I terms of semantics, I guess for strings it's fine but I can imagine
  some surprises if we try to apply the same idea to some
  other literals.  ]


        Stefan