I want the next version of Midje to continue to support Clojure 1.3. I also
want to use `leiningen.core.project`. `leiningen.core.project` uses `ex-info`,
which was introduced in 1.4. I want to write my own version of `ex-info` and
put it into `clojure.core` when we're running under 1.3 --- in such a way that
`leiningen.core.project` will see that fake version when it's `required`.
I thought I could do this:
user=> (in-ns 'clojure.core)
clojure.core=> (defn ex-info [& args] "stuff here")
clojure.core=> (in-ns 'user)
user=> (require 'leiningen.core.project)
Indeed, that works fine in the repl. However, it doesn't work when the first
three lines are in a file. Specifically, this fails:
(ns midje.repl
(:require ...
midje.util.backwards-compatible-utils
[leiningen.core.project :as project]
... when `m.u.backwards-compatible-utils` contains:
(when (ecosystem/clojure-1-3?)
(in-ns 'clojure.core)
(defn ex-info ...)
(in-ns 'midje.util.backwards-compatible-utils))
Why not? What should I do instead?
-----
Brian Marick, Artisanal Labrador
Contract programming in Ruby and Clojure
Occasional consulting on Agile
Author of /Functional Programming for the Object-Oriented Programmer/:
https://leanpub.com/fp-oo
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