The Defer Technical Specification: It Is Time

The defer TS introduces a scope-based 'undo' mechanism in C, ensuring a set of statements are run at the end of a block, regardless of how the block is exited. Inspired by existing practices like GCC's __attribute__((cleanup)), defer offers a more explicit and comprehensive solution for resource management, reducing human errors and preventing memory leaks. The defer keyword simplifies resource cleanup, enhances code reliability, and is positioned as a must-implement feature by compiler vendors before C2Y ships.