@@
expression V, E1, E2;
statement S;
@@

- V = dns_name_copy(E1, E2, NULL);
- if (V != ISC_R_SUCCESS) S
+ dns_name_copy(E1, E2);

@@
expression V, E1, E2;
statement S1, S2;
@@

- V = dns_name_copy(E1, E2, NULL);
- if (V == ISC_R_SUCCESS) S1 else S2;
+ dns_name_copy(E1, E2);
+ S2

@@
expression V, E1, E2;
statement S1, S2;
@@

- V = dns_name_copy(E1, E2, NULL);
- S1
- if (V == ISC_R_SUCCESS) S2
+ dns_name_copy(E1, E2);
+ S1
+ S2