Fix panic when x.py is called without any arguments.

rust-lang · Feb 18, 2018 · d64aee0 · d64aee0
1 parent b8af50a
commit d64aee0
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
@@ -385,8 +385,10 @@ impl<'a> Builder<'a> {
             Subcommand::Clean { .. } => panic!(),
         };
 
-        if paths[0] == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
-            return;
+        if let Some(path) = paths.get(0) {
+            if path == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
+                return;
+            }
         }
 
         let builder = Builder {