Rust errors / Everything else
Rust compiler error · checked with rustc 1.99.0
Rust error E0767: use of unreachable label `'a`
What it meansAn unreachable label was used.
What rustc prints
error[E0767]: use of unreachable label `'a` --> main.rs:5:22 | 3 | 'a: loop { | -- unreachable label defined here 4 | || { 5 | loop { break 'a } // error: use of unreachable label `'a` | ^^ unreachable label `'a` | = note: labels are unreachable through functions, closures, async blocks and modules
Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0767Everything else
Activein rustc 1.99.0
8related errors linked below
The compiler team's explanation
An unreachable label was used.
Erroneous code example:
'a: loop {
|| {
loop { break 'a } // error: use of unreachable label `'a`
};
}Ensure that the label is within scope. Labels are not reachable through functions, closures, async blocks or modules. Example:
'a: loop {
break 'a; // ok!
}From rustc --explain E0767 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
Related errors
- E0061this function takes N arguments but M were supplied
- E0412cannot find type in this scope
- E0515cannot return reference to local variable
- E0728await is only allowed inside async functions and blocks
- E0765unterminated double quote string
- E0766unterminated double quote byte string
- E0768no valid digits found for number
- E0781the `"cmse-nonsecure-call"` ABI is only allowed on function pointers
Up next
Often hit nextE0061: this function takes N arguments but M were suppliedA related error from the same family.Read it next →Did this answer your question?