don't add -- if remainder is empty

Author: Mandragorian

miri-script/src/main.rs

@@ -130,10 +130,11 @@ impl Command {
             | Self::Fmt { flags }
             | Self::Clippy { flags }
             | Self::Run { flags, .. }
-            | Self::Test { flags, .. } => {
-                flags.push("--".into());
-                flags.extend(remainder);
-            }
+            | Self::Test { flags, .. } =>
+                if !remainder.is_empty() {
+                    flags.push("--".into());
+                    flags.extend(remainder);
+                },
             _ => (),
         }
     }
@@ -216,6 +217,7 @@ fn main() -> Result<()> {
     let args = Cli::parse_from(miri_args);
     let mut command = args.command;
     command.add_remainder(remainder);
+    dbg!(&command);
     command.exec()?;
     Ok(())
 }