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Inconsistent dealing with unknown symbol with (doc) function #520

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Description

The first time you call the doc function on an unknown symbol, it returns nil. After this symbol has been found to be unknown in a new statement, runnning doc on it returns an undefined symbol RuntimeException.

user => (doc foo)
nil
user => foo
ERROR: 
 in pixie function repl_fn
in pixie/repl.pxi at 27:24
 (let [x (eval form)]
 ^
in internal function eval
in <unknown> at 20:1
foo
^
RuntimeException: :pixie.stdlib/AssertionException Var foo is undefined
user => (doc foo)
ERROR: 
 in pixie function repl_fn
in pixie/repl.pxi at 27:24
 (let [x (eval form)]
 ^
in internal function eval
in pixie function doc
in pixie/stdlib.pxi at 1454:18
 x (if vr @vr)
 ^
in polymorphic function -deref dispatching on pixie.stdlib.Var
in internal function __deref
RuntimeException: :pixie.stdlib/AssertionException Var foo is undefined
user => (doc bar)
nil

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