Would it make sense to have a `let-immutable` form that was just like
`let` but that forbade use of `set!` with introduced variables?
I'm thinking it could be handy for authors of libraries that introduce a
lot of bindings in DSLs where mutability has to be strictly controlled.
I think it is probably possible to get the effect of `let-immutable`
with careful use of identifier macros, but would there be advantages
internal to the compiler/runtime of being able to up-front, primitively
declare a set of bindings as immutable?
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