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$ goto-cc test.c -o test.goto
test.c: In function 'foo':
test.c:3:1: error: side-effects not allowed in assigns clause targets
void foo(void) __CPROVER_assigns(errno) {
CONVERSION ERROR
1$
If I don't add errno to the assigns clause, I get verification failed with [foo.assigns.1] line 4 Check that *return_value___errno_location is assignable: FAILURE