PVARS:DEFAULT called with #

Oddity 3: This may be related to #2 (closed), but when I try to run the example by calling (main) in the REPL, I get this error:

There is no applicable method for the generic function
  #<STANDARD-GENERIC-FUNCTION PVARS::DEFAULT (1)>
when called with arguments
  (#<unbound>).
   [Condition of type SB-PCL::NO-APPLICABLE-METHOD-ERROR]

I'm using SBCL, and *foo* is properly stored in pvars::*pvars*. (macroexpand '*foo*) properly expands to (PVARS::ACCESS #:G0), but the stack frames show (PVARS::ACCESS #<unbound>).