You can see it at work in this:
user=> foo
(unable to resolve foo)
user=> (when nil (def foo 42))
nil
user=> foo
(unbound var foo)
When a ‘def’ form is _compiled_ -- which happens in the above case because the
whole form must be compiled – then it interns the var.
The ‘def’ form is parsed in DefExpr$Parser.parse() and it calls lookupVar(sym,
true) – which interns the symbol if it is new (i.e., not yet seen). See various
parts of:
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java
Sean Corfield -- (970) FOR-SEAN -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
On 6/30/17, 11:28 AM, "Didier" <[email protected] on behalf of
[email protected]> wrote:
I admit, this is very surprising. It looks like evaluation happens in two
pass, like first it finds all defs and declares them, interning the symbol and
creating an unbound var. And on a second pass it evaluates the full form.
Can someone more informed confirm or explain in more details what's
responsible for this behavior?
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