@@
statement S;
expression V;
@@

- V =
  dns_message_create(...);
- if (V != ISC_R_SUCCESS) S

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

- V =
  dns_message_create(...);
- if (V == ISC_R_SUCCESS)
  S1
- else S2

@@
expression V;
@@

- V =
  dns_message_create(...);
- check_result(V, ...);

@@
@@

- CHECK(
  dns_message_create(...)
- )
  ;

@@
@@

- DO(...,
  dns_message_create(...)
- )
  ;

@@
@@

- RETERR(
  dns_message_create(...)
- )
  ;

@@
expression V;
@@

- V =
  dns_message_create(...);
- assert_int_equal(V, ISC_R_SUCCESS);

@@
expression V;
@@

- V =
  dns_message_create(...);
- CHECK(..., V);

@@
expression V;
statement S;
@@

- V =
  dns_message_create(...);
- if (ISC_UNLIKELY(V != ISC_R_SUCCESS)) S

@@
expression V;
@@

- V =
  dns_message_create(...);
- RUNTIME_CHECK(V == ISC_R_SUCCESS);