Fix missing newline after cxxbridge02$exception declaration
diff --git a/gen/write.rs b/gen/write.rs
index 9a33fc5..ff5670c 100644
--- a/gen/write.rs
+++ b/gen/write.rs
@@ -278,7 +278,7 @@
 
     if has_cxx_throws {
         out.next_section();
-        write!(
+        writeln!(
             out,
             "const char *cxxbridge02$exception(const char *, size_t);",
         );