7     let mut segments = Vec::new();  in concat_helper()  localVariable
19                 segments.push((value, lit.span()));  in concat_helper()
26                 segments.push((value, ident.span()));  in concat_helper()
33                 let (mut value, sp) = segments.pop().expect("expected identifier before modifier");  in concat_helper()
47                 segments.push((value, sp));  in concat_helper()
51                 segments.append(&mut concat_helper(tokens.as_slice()));  in concat_helper()
53             token => panic!("unexpected token in paste segments: {:?}", token),  in concat_helper()
57     segments  in concat_helper()
61     let segments = concat_helper(tokens);  in concat()  localVariable
62     let pasted: String = segments.into_iter().map(|x| x.0).collect();  in concat()
90     // Path segments cannot contain invisible delimiter group, so remove them if any.  in expand()