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Issue when pattern matching on tuples using guards #14913
Description
The code:
fn main() {
let (name, street) = ("John".to_str(), "Something".to_str());
match (name, street) {
(ref n, s) if *n == "...".to_str() => (),
_ => ()
}
}
The error message:
test.rs:4:17: 4:18 error: cannot bind by-move into a pattern guard
test.rs:4 (ref n, s) if *n == "...".to_str() => (),
^
error: aborting due to previous error
This forces you to use ref s to satisfy the compiler, but s is not used at all in the pattern guard! I think it this code should compile without ref s.
Activity
alexcrichton commentedon Jun 16, 2014
Closing, this is just a fact of rustc right now. You're not allowed to move in a pattern with a guard. For relaxing these restrictions, rust-lang/rfcs#107 seems to do the trick.
Auto merge of rust-lang#14913 - HKalbasi:fix14844, r=HKalbasi