Document gotcha with unintended recursion in let
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@ -240,7 +240,8 @@ The ``let`` macro takes two parameters: a list defining *variables*
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and the *body* which gets executed. *variables* is a vector of
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and the *body* which gets executed. *variables* is a vector of
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variable and value pairs.
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variable and value pairs.
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``let`` executes the variable assignments one-by-one, in the order written.
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Like the ``let*`` of many other Lisps, ``let`` executes the variable
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assignments one-by-one, in the order written::
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.. code-block:: hy
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.. code-block:: hy
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@ -249,4 +250,8 @@ variable and value pairs.
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... (print x y))
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... (print x y))
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5 6
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5 6
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Unlike them, however, each ``(let …)`` form uses only one
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namespace for all its assignments. Thus, ``(let [x 1 x (fn [] x)]
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(x))`` returns a function object, not 1 as you might expect.
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It is an error to use a let-bound name in a ``global`` or ``nonlocal`` form.
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It is an error to use a let-bound name in a ``global`` or ``nonlocal`` form.
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