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README: system deps, Ultralisp link, can't share a core image

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docs/language-extensions.md
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@ -60,11 +60,13 @@ And there is more. All the available macros are:
We import the `bind` macro from [metabang-bind](https://common-lisp.net/project/metabang-bind/user-guide.html) ([GitHub](https://github.com/gwkkwg/metabang-bind)).
The idiomatic way to declare local variables is `let`. Use it if it is fine for you.
The idiomatic way to declare local variables is `let` (and `let*`),
the way to declare local functions is `flet` (and `labels`). Use them
if it is fine for you.
However, if you ever noticed to write convoluted `let` forms, adding
list destructuring, multiple values or slot access into the mix, then
read on.
However, if you ever noticed you write convoluted `let` forms, adding
list destructuring, multiple values or slot access into the mix, and
if you use a `flet` *and then* a `let`, then read on.
`bind` integrates more variable binding and list destructuring idioms. It has two goals. Quoting:
@ -75,7 +77,7 @@ read on.
### Bind in CIEL
We import the `bind` macro. However, the package has more external
symbols that we don't import, such as its error type (`bind-erro`) and
symbols that we don't import, such as its error type (`bind-error`) and
its extension mechanism.
> Note: if you like object destructuring in general, you'll like [pattern matching](/language-extensions?id=pattern-matching).