How to Use --explain to Get Detailed Error Explanations

The --explain flag is not a standard option for the rustc compiler or cargo to get detailed error explanations; the compiler already provides detailed messages by default. To see the full explanation for a specific error code, run rustc --explain <ERROR_CODE> replacing <ERROR_CODE> with the code from your error message (e.g., E0308).

rustc --explain E0308

This command prints the full documentation for that error, including a description, common causes, and examples of how to fix it.

When Rust code fails to compile, it gives you an error code like E0308. You can ask the compiler to explain exactly what that code means by using the explain command. It's like looking up a specific error in a manual to get a detailed guide on how to fix it.