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@@
statement S;
expression V;
@@

V = isc_mem_strdup(...);
- if (V == NULL) S

@@
type T;
statement S;
expression V;
@@

V = (T *)isc_mem_strdup(...);
- if (V == NULL) S

@@
statement S;
expression V;
@@

if (V == NULL) V = isc_mem_strdup(...);
- if (V == NULL) S

@@
statement S1, S2;
expression V;
@@

V = isc_mem_strdup(...);
- if (V == NULL) S1 else { S2 }
+ S2