Hi Ricardo,

Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de> skribis:

> In language/tree-il/analyze.scm:
>   1053:33  3 Exception thrown while printing backtrace:
> ERROR: In procedure assq: Wrong type argument in position 2 (expecting association list): ((system base pmatch) car . #f)
>
> ice-9/boot-9.scm:760:25: In procedure dispatch-exception:
> ice-9/boot-9.scm:760:25: In procedure assq: Wrong type argument in position 2 (expecting association list): ((system base pmatch) car . #f)

It’s a sign that the weak tables were too weak, this time.  :-)

The problem stems from the fact that weak pairs were initialized too
late.  Thus, the first calls to ‘scm_weak_car_pair’ were happening
before the weak-car pair GC descriptor had been initialized; they were
therefore using 0 as their descriptor, and ended up not being traced at
all by the GC.

The fix is to initialize weak pairs before symbols, as in 2.0: