Bug path

test
‘test’: events 1-2
8void test(void *p)
^~~~
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(1) entry to ‘test’
9{
10 calls_free(p);
~~~~~~~~~~~~~
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(2) calling ‘calls_free’ from ‘test’
calls_free
‘calls_free’: events 3-4
3static void calls_free(int *q)
^~~~~~~~~~
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(3) entry to ‘calls_free’
4{
5 free(q);
~~~~~~~
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(4) first ‘free’ here
‘test’: events 5-6
10 calls_free(p);
^~~~~~~~~~~~~
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(5) returning to ‘test’ from ‘calls_free’
11
12 free(p); /* { dg-warning "double-'free' of 'p'" } */
~~~~~~~
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(6) second ‘free’ here; first ‘free’ was at (4)