C has historically allowed implementations to treat external identifiers as identical if they differ only after the first 31 characters. Proposal N3911 removes this source of undefined behaviour, making every character significant and requiring diagnostics for identifiers that exceed an implementation's documented limit.

C23 made two cases of undefined behaviour involving invalid identifier characters impossible to trigger. Discover how proposal N3904 removes these obsolete rules and clarifies how compilers should diagnose invalid identifiers.

In today’s rapidly evolving tech landscape, memory safety has become a critical concern for developers, team leaders, and organisations alike.