Stage0 compiles without errors

Author: Nicholas-Baron

src/librustc_interface/passes.rs

@@ -547,7 +547,7 @@ fn write_out_deps(
             .iter()
             .filter(|fmap| fmap.is_real_file())
             .filter(|fmap| !fmap.is_imported())
-            .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
+            .map(|fmap| escape_dep_filename(&fmap.name.unmapped_path()))
             .collect();
 
         if sess.binary_dep_depinfo() {