Hi,

I've checked guile-gi test/insanity.scm again to find "hard" evidence.

For that, I've just checked out guile-gi anew, then ran test/insanity.scm.

Steps:

(1) git clone https://github.com/spk121/guile-gi.git guile-gi
(2) cd guile-gi
(3) git checkout b454a99b65f927e947faab17d25bd3499829c1b4 # the current one
(4) guix environment --pure -l guix.scm --ad-hoc gtk+ guile
(5) ./bootstrap && ./configure && make
(6) tools/run-guile test/insanity.scm
%%%% Starting test insanity.scm  (Writing full log to "insanity.scm.log")
/home/dannym/src/guile-gi/guile-gi/test/insanity.scm:19: FAIL GObject.Value
/home/dannym/src/guile-gi/guile-gi/test/insanity.scm:23: FAIL GObject.Closure
# of expected passes      1
# of unexpected failures  2
WARNING: (guile-user): imported module (gi) overrides core binding `quit'
(7) cat insanity.scm.log
%%%% Starting test insanity.scm
Group begin: insanity.scm
Test begin:
  test-name: "GObject.Object"
  source-file: "/home/dannym/src/guile-gi/guile-gi/test/insanity.scm"
  source-line: 15
  source-form: (test-equal "GObject.Object" <GObject> (module-ref m (quote <GObject>)))
Test end:
  result-kind: pass
  actual-value: #<<class> <GObject> 7f2d4e2ca180>
  expected-value: #<<class> <GObject> 7f2d4e2ca180>
Test begin:
  test-name: "GObject.Value"
  source-file: "/home/dannym/src/guile-gi/guile-gi/test/insanity.scm"
  source-line: 19
  source-form: (test-equal "GObject.Value" <GValue> (module-ref m (quote <GValue>)))
Test end:
  result-kind: fail
  actual-value: #<<class> <GValue> 7f2d4e2ea680>
  expected-value: #<<applicable-struct-with-setter-class> <GValue> 7f2d4e2e0200>
Test begin:
  test-name: "GObject.Closure"
  source-file: "/home/dannym/src/guile-gi/guile-gi/test/insanity.scm"
  source-line: 23
  source-form: (test-equal "GObject.Closure" <GClosure> (module-ref m (quote <GClosure>)))
Test end:
  result-kind: fail
  actual-value: #<<class> <GClosure> 7f2d4e2ea900>
  expected-value: #<<applicable-struct-class> <GClosure> 7f2d4e2eae80>
Group end: insanity.scm
# of expected passes      1
# of unexpected failures  2

That's it.  It fails.

(8) Using attached dlopen logger (gcc -fPIC -shared -o block-open.so block-open.c, then edit tools/uninstalled-env bottom before the exec to export LD_PRELOAD=$PWD/block-open.so), I get:
dlopen libguile-gi
dlopen /home/dannym/src/guile-gi/guile-gi/./.libs/libguile-gi.so.5
dlopen libguile-gi
dlopen libguile-gi
dlopen libguile-gi
dlopen libguile-gi
dlopen libguile-gi
dlopen libguile-gi
dlopen /gnu/store/xa1vfhfc42x655hi7vxqmbyvwldnz7r0-glib-2.62.6/lib/libgobject-2.0.so.0

There it is again.

(9) ldd /home/dannym/src/guile-gi/guile-gi/./.libs/libguile-gi.so.5 |grep gobject
[...]
        libgobject-2.0.so.0 => /gnu/store/4jl613j0d5y6icbxxmwij75fd0i7qpwn-profile/lib/libgobject-2.0.so.0 (0x00007fe2a0677000)

And there is the other one.

Now how do I get more info, using Guix tools?