syn_query 0.1.0

implement Trait Syn::Visit
Documentation 
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 implement Trait Syn::Visit
 ## Example
 ```rust
 extern crate proc_macro2;
 extern crate syn;
 extern crate syn_query;
 use syn::{Ident,ExprStruct,FieldValue};
 use proc_macro2::Span;
 fn main() {
     let s="Point { x: 1, y: 1 }";
     let st:ExprStruct=syn::parse_str(s).unwrap();
     let qr = syn_query::query::<Ident,_>(st.clone());
     assert_eq!(qr[0].data, Ident::new("Point",Span::call_site()));
     assert_eq!(qr[0].path, vec![0i64,0i64,0i64]);
     assert_eq!(qr[1].data, Ident::new("x",Span::call_site()));
     assert_eq!(qr[1].path, vec![2i64,0i64,0i64]);
     assert_eq!(qr[2].data, Ident::new("y",Span::call_site()));
     assert_eq!(qr[2].path, vec![3i64,0i64,0i64]);
     let qr = syn_query::query::<FieldValue,_>(st.clone()).filter(|x| x.path[0] == 3).query::<Ident>();
     assert_eq!(qr[0].data, Ident::new("y",Span::call_site()));
     assert_eq!(qr[0].path, vec![3i64,0i64,0i64]);
 }
 ```