rust/tests/ui/cannot-mutate-captured-non-mut-var.rs
2023-01-11 09:32:08 +00:00

16 lines
435 B
Rust

#![feature(unboxed_closures, tuple_trait)]
use std::io::Read;
fn to_fn_once<A:std::marker::Tuple,F:FnOnce<A>>(f: F) -> F { f }
fn main() {
let x = 1;
to_fn_once(move|| { x = 2; });
//~^ ERROR: cannot assign to `x`, as it is not declared as mutable
let s = std::io::stdin();
to_fn_once(move|| { s.read_to_end(&mut Vec::new()); });
//~^ ERROR: cannot borrow `s` as mutable, as it is not declared as mutable
}