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test17.c: In function 'func2':
test17.c:18:14: warning: comparison between pointer and integer
if (ptr1 == (123, 0))
^
test17.c:20:15: warning: Using parameter 'ptr1' without checking for null pointer
ptr1->val = 100;
^
test17.c:20:15: warning: Using field 'ptr1' without checking for null pointer
test17.c: In function 'func3':
test17.c:26:14: warning: comparison between pointer and integer
if (ptr1 != (123, 0))
^
test17.c:28:15: warning: Using parameter 'ptr1' without checking for null pointer
ptr1->val = 100;
^
test17.c:28:15: warning: Using field 'ptr1' without checking for null pointer
test17.c: In function 'func4':
test17.c:40:15: warning: Using parameter 'ptr1' without checking for null pointer
ptr1->val = 100;
^
test17.c:40:15: warning: Using field 'ptr1' without checking for null pointer
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