Can't build because of error in frame-support v2.0.0-rc2

[udibr]

I run cargo build --release -p kitchen-node
and get

  Compiling frame-support v2.0.0-rc2
error[E0424]: expected value, found module `self`
   --> ~/.cargo/registry/src/github.jparrowsec.cn-1ecc6299db9ec823/frame-support-2.0.0-rc2/src/traits.rs:913:11
    |
911 | / bitmask! {
912 | |     /// Reasons for moving funds out of an account.
913 | |     #[derive(Encode, Decode)]
    | |              ^^^^^^ `self` value is a keyword only available in methods with a `self` parameter
914 | |     pub mask WithdrawReasons: i8 where
...   |
929 | |     }
930 | | }
    | |_- this function has a `self` parameter, but a macro invocation can only access identifiers it receives from parameters
    |
    = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0424`.
error: could not compile `frame-support`.

[JoshOrndorff]

Hi @udibr Thanks for trying out the recipes. I've run the command myself, and I did not hit the error you reported. You may be getting this error because of your rust compiler version. Can you please run rustup show and post the output here? I've included my own rust versions for comparison.

joshy@pop-os:~/ProgrammingProjects/recipes$ cargo build --release -p kitchen-node
    Updating git repository `https://github.com/encointer/substrate-fixed.git`
   Compiling syn v1.0.27
   Compiling sp-std v2.0.0-rc2
   ...
   Compiling sc-cli v0.8.0-rc2
    Finished release [optimized] target(s) in 6m 04s

joshy@pop-os:~/ProgrammingProjects/recipes$ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/joshy/.rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu
nightly-2020-03-01-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu
1.43.1-x86_64-unknown-linux-gnu (default)

installed targets for active toolchain
--------------------------------------

wasm32-unknown-unknown
x86_64-unknown-linux-gnu

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

1.43.1-x86_64-unknown-linux-gnu (default)
rustc 1.43.1 (8d69840ab 2020-05-04)

[udibr]

recipes % rustup show
Default host: x86_64-apple-darwin
rustup home:  /Users/ehudben-reuven/.rustup

installed toolchains
--------------------

stable-x86_64-apple-darwin (default)
nightly-x86_64-apple-darwin

installed targets for active toolchain
--------------------------------------

wasm32-unknown-unknown
x86_64-apple-darwin

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

nightly-x86_64-apple-darwin (directory override for '/Users/ehudben-reuven/Downloads/github/recipes')
rustc 1.45.0-nightly (4bd32c980 2020-05-29)

[JoshOrndorff]

Indeed this was caused by a compiler problem. Here is the corresponding issue in Substrate itself paritytech/substrate#6167

It seems the compiler was reverted to its old behavior, so you should be able to update your toolchain (just run curl https://getsubstrate.io -sSf | bash -s -- --fast again) and succeed with the build.

[udibr]

Works! Thanks!!

(I tried before doing rustup override set 1.43.1 but that didn't help)