(let [foo (let [bar 2] (str bar))] foo)

"2"

(let [a "test"])

nil

(let (foo 3))

nil

(let [] (defn foo []))

#'user/foo

(let [argmap 1])

nil

(let (((mymacro 1))))

nil

(let [a 0])

nil

(let [x 1]
  (let [x 2] x)
  x)

1

(let [foo "bar"] (if foo (let [foo "baz"])))

nil

(let [x (gensym)] `(let [~x 123] ~x))

(clojure.core/let [G__3084611 123] G__3084611)

(let [f (let [*clojure-version* 10] (fn [] *clojure-version*))] (f))

10

(let [x 1] `(let [var# ~x] var#))

(clojure.core/let [var__1247814__auto__ 1] var__1247814__auto__)

(let [x (gensym)] `(let [~x ...] ...))

(clojure.core/let [G__1250019 user/...] user/...)

(let [a 42] (let [a (inc a)] a))

43

(let [N (range)])

nil

(let [y (rand)])

nil

(let ((x 1)))

nil

(let [x 2.0])

nil

(let [[foo] [10]])

nil

(let [mem (atom {})])

nil

(let [eval 3])

nil

(let [x 1])

nil

(let []
  42
  :a)

:a

(let [x# 1])

nil

(let [x 5])

nil

(let [_-*!?omg?!*-_ "buuaahhaha"])

nil

(let [foo :bar])

nil

(let [ "wat"] )

"wat"

(let [{foo :bar}])

nil

(let [_-*!?.omg.?!*-_ "buuaahhaha"])

nil

(quote (let 1))

(let 1)

(let ((foo bar)))

nil

(let [a 'foo])

nil

(let [x 10])

nil

(let [a 1])

nil

(let [points 0])

nil

(let [line read-line])

nil

(let [x (vector)])

nil

(let [p# println])

nil

(let ((mymacro 1)))

nil

(let [varname 1])

nil

(let [<> {}] (<> {} []))

[]

(let [c 1])

nil

(let [clojure.core/argmap 1])

nil

(loop [] (let [stuff]))

nil

(macroexpand '(let [a 1] (let [b 2] 3)))

(let [a 1] (let [b 2] 3))

(let [a 1] (let [b 2] (+ a b)))

3

(let [i (let [k (int 0)] k)] (inc i))

1

(let [a "hi"] (with-out-str (println (let [a "123"]) a)))

"nil hi\n"

(let [y 2] (= y (let [x y] x)))

true