Adding PaysFee to #[pallet::weight("")] produces unexpected token error

Question

I'm working with the node template and I want a particular type of extrinsic to not have to pay a fee. I followed these instructions but whenever I add another value to the "pallet::weight(10_000)" tuple after the weight data and do "cargo build --release", I get this error.

error: unexpected token
  --> pallets/wavefunction/src/lib.rs:71:32
   |
71 |         #[pallet::weight(10_000, Pays::No)]
   |  

You can't see it here but in my terminal there's a caret pointing to the comma between "10_000" and "Pays::No". Clearly it doesn't like the comma but the documentation says that it's fine. I've tried it with a fresh template and with different types of weight values (10_000, 1000, etc. ) and the build works fine. I only get this error when I try to add an additional value to the tuple like the dispatch class or whether or not a fee should be paid. I've tried it without using any commas but I just get another error.

This is the version of the Rust toolchain I'm using

active toolchain
----------------

stable-x86_64-unknown-linux-gnu (default)
rustc 1.59.0 (9d1b2106e 2022-02-23)

Answer 1

I think this is a mistake in the docs, rather than:

#[pallet::weight(10_000, Pays::No)]

it should be as a tuple:

#[pallet::weight((10_000, Pays::No))]

I agree it would be nicer if this wasn't the case... but for now I'll fix the instructions.