1 files changed, 5 insertions, 6 deletions
diff --git a/compiler/rustc_query_system/src/dep_graph/debug.rs b/compiler/rustc_query_system/src/dep_graph/debug.rs
index 4d009d63de5..12ed5742711 100644
--- a/compiler/rustc_query_system/src/dep_graph/debug.rs
+++ b/compiler/rustc_query_system/src/dep_graph/debug.rs
@@ -46,15 +46,14 @@ pub struct EdgeFilter {
 
 impl EdgeFilter {
     pub fn new(test: &str) -> Result<EdgeFilter, Box<dyn Error>> {
-        let parts: Vec<_> = test.split("->").collect();
-        if parts.len() != 2 {
-            Err(format!("expected a filter like `a&b -> c&d`, not `{test}`").into())
-        } else {
+        if let [source, target] = *test.split("->").collect::<Vec<_>>() {
             Ok(EdgeFilter {
-                source: DepNodeFilter::new(parts[0]),
-                target: DepNodeFilter::new(parts[1]),
+                source: DepNodeFilter::new(source),
+                target: DepNodeFilter::new(target),
                 index_to_node: Lock::new(FxHashMap::default()),
             })
+        } else {
+            Err(format!("expected a filter like `a&b -> c&d`, not `{test}`").into())
         }
     }