Open
Description
Code
fn main() {
r#"ok!"###;
}Current output
error: reserved multi-hash token is forbidden
--> src/main.rs:2:13
|
2 | r#"ok!"###;
| ^^
|
= note: sequences of two or more # are reserved for future use since Rust 2024
help: consider inserting whitespace here
|
2 | r#"ok!"## #;
| +
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `##`
--> src/main.rs:2:13
|
2 | r#"ok!"###;
| ^^ expected one of `.`, `;`, `?`, `}`, or an operator
error: could not compile `playground` (bin "playground") due to 2 previous errorsDesired output
error: too many `#` when terminating raw string
--> src/main.rs:2:13
|
2 | r#"ok!"###;
| --------^^ help: remove the extra `#`
| |
| this raw string started with 1 `#`
error: could not compile `playground` (bin "playground") due to 1 previous errorRationale and extra context
rustc is already capable of warning the user if a raw string is found to be finalized with one more octothorpe (#) than expected. To avoid confusion, the compiler reserves multi-hash tokens, ensuring that ### and #"foo"# are not interpreted as three separate tokens in macro invocations (see here). However, in my opinion, raw strings whose terminators are followed by one or more '#' characters may not create an edge case. They must already be recognized by the compiler as a "malformed token."
Rust Version
rustc 1.88.0-nightly (4824c2bb7 2025-05-02)
binary: rustc
commit-hash: 4824c2bb7445cb2478aab0190c268c939d77a0f6
commit-date: 2025-05-02
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.2Anything else?
No response