message: add superfluous value return to calm compiler warnings
diff: @@ -717,6 +717,7 @@ llvm::Type* Compiler::CType(DataType type) {
  case DataType::INVALID:
  case DataType::PRNG:
  throw Error("Invalid type: " + to_string(type));
  + return builder_.getVoidTy();
  }
  }
  