The doctest picks up the pickled stuff from
$SAGE_ROOT/data/extcode/pickle_jar/pickle_jar.tar.bz2
which you get in the source distribution.
Actually, if I try, on ARM, at the sage prompt the following:
sage: sage.structure.sage_object.unpickle_all()
I get the same "Failed to unpickle 5 objects." result.
In short, ARM cannot unpickle correctly some stuff pickled elsewhere....
You can reproduce this by
untarring $SAGE_ROOT/data/extcode/pickle_jar/pickle_jar.tar.bz2
somewhere, creating a directory, say, /tmp/jah/, and say, putting there
_class__sage_coding_linear_code_LinearCode__.sobj
_class__sage_coding_linear_code_LinearCode__.txt
Then we see:
sage: sage.structure.sage_object.unpickle_all('/tmp/jah/')
* unpickle failure:
load('/tmp/jah//_class__sage_coding_linear_code_LinearCode__.sobj')
Failed:
_class__sage_coding_linear_code_LinearCode__.sobj
Successfully unpickled 0 objects.
Failed to unpickle 1 objects.
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