Remove uneeded syn::parse_str from pyo3-derive-backend

pyo3-derive-backend/src/module.rs

@@ -113,7 +113,7 @@ fn extract_pyfn_attrs(
                     // read Python fonction name
                     match meta[1] {
                         syn::NestedMeta::Literal(syn::Lit::Str(ref lits)) => {
-                            fnname = Some(syn::parse_str(&lits.value()).unwrap());
+                            fnname = Some(syn::Ident::new(&lits.value(), lits.span()));
                         }
                         _ => panic!("The second parameter of pyfn must be a Literal"),
                     }

pyo3-derive-backend/src/pyclass.rs

@@ -265,7 +265,8 @@ fn impl_class(
     };
 
     let extra = if !descriptors.is_empty() {
-        let ty = syn::parse_str(&cls.to_string()).expect("no name");
+        let path = syn::Path::from(syn::PathSegment::from(cls.clone()));
+        let ty = syn::Type::from(syn::TypePath { path, qself: None });
         let desc_impls = impl_descriptors(&ty, descriptors);
         quote! {
             #desc_impls
@@ -389,7 +390,7 @@ fn impl_descriptors(cls: &syn::Type, descriptors: Vec<(syn::Field, Vec<FnType>)>
                     let name = field.ident.clone().unwrap();
 
                     // FIXME better doc?
-                    let doc: syn::Lit = syn::parse_str(&format!("\"{}\"", name)).unwrap();
+                    let doc = syn::Lit::from(syn::LitStr::new(&name.to_string(), name.span()));
 
                     let field_ty = &field.ty;
                     match *desc {

pyo3-derive-backend/src/pyproto.rs

@@ -5,6 +5,7 @@ use crate::func::impl_method_proto;
 use crate::method::FnSpec;
 use crate::pymethod;
 use proc_macro2::TokenStream;
+use proc_macro2::Span;
 use quote::quote;
 use quote::ToTokens;
 
@@ -71,7 +72,7 @@ fn impl_proto_impl(
             for m in proto.py_methods {
                 let ident = met.sig.ident.clone();
                 if m.name == ident.to_string().as_str() {
-                    let name: syn::Ident = syn::parse_str(m.name).unwrap();
+                    let name = syn::Ident::new(m.name, Span::call_site());
                     let proto: syn::Path = syn::parse_str(m.proto).unwrap();
 
                     let fn_spec = match FnSpec::parse(&ident, &met.sig, &mut met.attrs) {

pyo3-derive-backend/src/utils.rs

@@ -1,6 +1,7 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
 use proc_macro2::TokenStream;
+use proc_macro2::Span;
 use syn;
 
 pub fn print_err(msg: String, t: TokenStream) {
@@ -32,13 +33,10 @@ pub fn get_doc(attrs: &[syn::Attribute], null_terminated: bool) -> syn::Lit {
         }
     }
 
-    let doc = doc.join("\n");
+    let mut docstr = doc.join("\n");
+    if null_terminated {
+        docstr.push('\0');
+    }
 
-    // FIXME: add span
-    syn::parse_str(&if null_terminated {
-        format!("\"{}\0\"", doc)
-    } else {
-        format!("\"{}\"", doc)
-    })
-    .unwrap()
+    syn::Lit::Str(syn::LitStr::new(&docstr, Span::call_site()))
 }