Bug path

test_2
‘test_2’: events 1-2
36 dealloc_fn (ptr); /* { dg-message "first 'free' here" } */
^~~~~~~~~~~~~~~~
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(1) first ‘free’ here
37 dealloc_fn (ptr); /* { dg-warning "double-'free'" } */
~~~~~~~~~~~~~~~~
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(2) second ‘free’ here; first ‘free’ was at (1)