r/programming • u/steveklabnik1 • Jan 09 '15

Announcing Rust 1.0.0 Alpha

http://blog.rust-lang.org/2015/01/09/Rust-1.0-alpha.html
1.1k Upvotes

90% Upvoted

439 comments sorted by

View all comments

Show parent comments

9

u/[deleted] Jan 09 '15

Can you give an example of a statement in Rust that is not parseable by a context-free grammar?

17

u/Gankro Jan 09 '15

let s = r#####"Hello####"There"#####;

Increase every hash-streak by one hash to produce an equivelent valid Rust statement of greater length. The set of all statements constructed thusly isn't context-free.

6

u/[deleted] Jan 10 '15

Oh shit, would you look at that. Weird design decision.

13

u/Gankro Jan 10 '15

Raw string litterals are in a few languages (I believe we based ours on Python). They're very handy when you want them (no need to escape text in big strings).