All the major Rust IDEs (VS Code, IntelliJ, and probably Vim + others) show the variable type inline when you don't provide it explicitly: https://i.imgur.com/9

All the major Rust IDEs (VS Code, IntelliJ, and probably Vim + others) show the variable type inline when you don't provide it explicitly: https://i.imgur.com/96Wfukl.png https://i.imgur.com/96Wfukl.png The white text on a gray background is provided by my IDE.