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fnmain(){letmut stdin = std::io::stdio::stdin();spawn(proc(){for line in stdin.lines(){print!("{}", line);}});}
Gives this warning:
<anon>:2:9: 2:18 warning: variable does not need to be mutable, #[warn(unused_mut)] on by default
<anon>:2 let mut stdin = std::io::stdio::stdin();
^~~~~~~~~
However, removing the mut is an error:
<anon>:4:21: 4:26 error: cannot borrow immutable captured outer variable in a proc `stdin` as mutable
<anon>:4 for line in stdin.lines() {
^~~~~
error: aborting due to previous error