try! issue

gistfile1.txt

<std macros>:5:8: 6:42 error: mismatched types:
 expected `()`,
    found `core::result::Result<_, _>`
(expected (),
    found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
<std macros>:1:1: 6:48 note: in expansion of try!
tests/traversals.rs:82:40: 82:65 note: expansion site
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation