@@ -1820,7 +1820,7 @@ pub(crate) fn parse<E: From<CompileError>>(
         && let Some(error) =
             rustpython_compiler::single_mode_multiple_statements_error(&source_file, &parsed)
     {
-        return Err(error);
+        return Err(error.into());
     }
     let type_comment_source =
         type_comments.then(|| TypeCommentSource::new(source, parsed.tokens()));
 
@@ -395,8 +395,8 @@ pub(super) fn emit_format_spec_warnings<E>(
             if let ast::Expr::FString(fstring) = expr {
                 // Conversion checked all enclosing specs before converting their
                 // expressions, including across concatenated f-string parts.
-                for part in fstring.value.as_slice() {
-                    if let ast::FStringPart::FString(part) = part {
+                for part in &fstring.value {
+                    if let ast::FStringPartRef::FString(part) = part {
                         self.visit_format_specs(&part.elements, part.flags.prefix().is_raw());
                     }
                 }
Original file line number	Diff line number	Diff line change
`@@ -1820,7 +1820,7 @@ pub(crate) fn parse<E: From<CompileError>>(`
`1820`	`1820`	`&& let Some(error) =`
`1821`	`1821`	`rustpython_compiler::single_mode_multiple_statements_error(&source_file, &parsed)`
`1822`	`1822`	`{`
`1823`		`- return Err(error);`
	`1823`	`+ return Err(error.into());`
`1824`	`1824`	`}`
`1825`	`1825`	`let type_comment_source =`
`1826`	`1826`	`type_comments.then(\|\| TypeCommentSource::new(source, parsed.tokens()));`
Original file line number	Diff line number	Diff line change
`@@ -395,8 +395,8 @@ pub(super) fn emit_format_spec_warnings<E>(`
`395`	`395`	`if let ast::Expr::FString(fstring) = expr {`
`396`	`396`	`// Conversion checked all enclosing specs before converting their`
`397`	`397`	`// expressions, including across concatenated f-string parts.`
`398`		`- for part in fstring.value.as_slice() {`
`399`		`- if let ast::FStringPart::FString(part) = part {`
	`398`	`+ for part in &fstring.value {`
	`399`	`+ if let ast::FStringPartRef::FString(part) = part {`
`400`	`400`	`self.visit_format_specs(&part.elements, part.flags.prefix().is_raw());`
`401`	`401`	`}`
`402`	`402`	`}`