cl-format throws ClassCastException: Writer cannot be cast to Future/IDeref

Description

Using ~I and ~_ etc fails in many situations, the most trivial one being:

Clojure 1.6.0 and 1.5.1:

Clojure 1.4.0

These work in other implementations, i.e. clisp, creating empty output in these trivial cases:

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Reporter

import

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Minor
Configure