char *buf __attribute__ ((__cleanup__(free_buf))) = malloc(1024);

    char* buf = cast(char*)malloc(1024);
    scope (exit) free(buf);

The rationale for it:

https://dlang.org/articles/exception-safe.html

The idea for this came from Andrei Alexandrescu and Petru Marginean who proposed it for C++:

http://drdobbs.com/184403758