Use new proc_macro::Span::file() api.

Author: m-ou-se

macros/src/error.rs

@@ -25,7 +25,7 @@ pub fn compile_error_msg(py: Python, error: PyErr, tokens: TokenStream) -> Token
 
 	if let Some(tb) = &error.traceback(py) {
 		if let Ok((file, line)) = get_traceback_info(tb) {
-			if file == Span::call_site().source_file().path().to_string_lossy() {
+			if file == Span::call_site().file() {
 				if let Ok(msg) = value.str() {
 					if let Some(span) = span_for_line(tokens, line) {
 						let error = format!("python: {}", msg);

macros/src/lib.rs

@@ -20,7 +20,7 @@ fn python_impl(input: TokenStream) -> Result<TokenStream, TokenStream> {
 
 	check_no_attribute(input.clone())?;
 
-	let filename = Span::call_site().source_file().path().to_string_lossy().into_owned();
+	let filename = Span::call_site().file();
 
 	let mut x = EmbedPython::new();
 
@@ -67,7 +67,7 @@ fn python_impl(input: TokenStream) -> Result<TokenStream, TokenStream> {
 fn ct_python_impl(input: TokenStream) -> Result<TokenStream, TokenStream> {
 	let tokens = input.clone();
 
-	let filename = Span::call_site().source_file().path().to_string_lossy().into_owned();
+	let filename = Span::call_site().file();
 
 	let mut x = EmbedPython::new();