message: Add debug line info
diff: @@ -518,8 +518,8 @@ mod tests {
  }
  println!("AssertUnlinkable Done");
  }
  - CommandKind::Register { name, as_name } => println!("Register not implemented"),
  - CommandKind::PerformAction(ref action) => println!("PerformAction not implemented"),
  + CommandKind::Register { name, as_name } => println!("Register not implemented {:?} {:?}", filename, line),
  + CommandKind::PerformAction(ref action) => println!("PerformAction not implemented {:?} {:?}", filename, line),
  _ => panic!("unknown wast command"),
  }
  }
  