remove all matches

src/input.rs

@@ -137,7 +137,11 @@ impl<'a> Input<'a> {
     }
 
     pub fn is_stdin(&self) -> bool {
-        matches!(self.kind, InputKind::StdIn)
+        if let InputKind::StdIn = self.kind {
+            true
+        } else {
+            false
+        }
     }
 
     pub fn with_name(mut self, provided_name: Option<&OsStr>) -> Self {