1@@
2expression x, y;
3statement S;
4@@
5  x = mbedtls_calloc(...);
6  y = mbedtls_calloc(...);
7  ...
8* if (x == NULL || y == NULL)
9    S
10
11@@
12expression x, y;
13statement S;
14@@
15  if (
16*   (x = mbedtls_calloc(...)) == NULL
17    ||
18*   (y = mbedtls_calloc(...)) == NULL
19  )
20    S
21