Remove uneeded imports from py_class.rs

pyo3-derive-backend/src/py_class.rs

@@ -1,10 +1,9 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
-use std;
 use std::collections::HashMap;
 
 use syn;
-use quote::{Tokens, ToTokens};
+use quote::Tokens;
 
 use utils;
 use method::{FnType, FnSpec, FnArg};

pyo3-derive-backend/src/py_impl.rs

@@ -10,7 +10,7 @@ pub fn build_py_methods(ast: &mut syn::ItemImpl) -> Tokens {
     if ast.trait_.is_some() {
         panic!("#[methods] can not be used only with trait impl block");
     } else {
-        impl_methods(&iimpl.self_ty, &mut iimpl.items)
+        impl_methods(&ast.self_ty, &mut ast.items)
     }
 }
 

pyo3-derive-backend/src/py_proto.rs

@@ -49,7 +49,7 @@ pub fn build_py_proto(ast: &mut syn::ItemImpl) -> Tokens {
             let mut seg = path.segments.pop().unwrap().into_value();
             seg.arguments = syn::PathArguments::AngleBracketed(parse_quote!{<'p>});
             path.segments.push(seg);
-            expr.generics.params = parse_quote!{'p};
+            ast.generics.params = parse_quote!{'p};
 
             tokens
         } else {