Failed to compile at branch moonbeam-polkadot-v0.9.18, commit 7002160

[AuroraLantean]

error[E0658]: use of unstable library feature 'proc_macro_is_available'
  --> /home/user2038/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.37/src/detection.rs:28:21
   |
28 |     let available = proc_macro::is_available();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #71436 <https://github.com/rust-lang/rust/issues/71436> for more information
   = help: add `#![feature(proc_macro_is_available)]` to the crate attributes to enable

For more information about this error, try `rustc --explain E0658`.
error: could not compile `proc-macro2` due to previous error
warning: build failed, waiting for other jobs to finish...
error: build failed

my Rust compiler was chosen by the rust-toolchain file:
pureStakeCrowdloanReward git:(moonbeam-polkadot-v0.9.18) $ rustup show

Default host: x86_64-unknown-linux-gnu
rustup home:  /home/user2038/.rustup
installed toolchains
stable-x86_64-unknown-linux-gnu
nightly-2021-09-10-x86_64-unknown-linux-gnu
nightly-2021-11-12-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu
bpf
1.59.0-x86_64-unknown-linux-gnu (default)

installed targets for active toolchain
wasm32-unknown-unknown
x86_64-unknown-linux-gnu

active toolchain
nightly-2021-09-10-x86_64-unknown-linux-gnu (overridden by '/mnt/sda3/polkadot/pureStakeCrowdloanReward/rust-toolchain')
rustc 1.57.0-nightly (497ee321a 2021-09-09)

[crystalin]

@notlesh do you have an idea what could be the issue ?

[notlesh]

@AuroraLantean how exactly are you compiling this (e.g. what command)? I don't get this error if I do cargo build --release in this repo.

That said, the compiler in rust-toolchain is very old. Give #56 a try and see if it helps.

[AuroraLantean]

@notlesh for me, both "cargo test" and "cargo build --release" in the moonbeam-polkadot-v0.9.18 branch result in the same error above. Yes the compiler in rust-toolchain is very old... I suggest using Rust 1.59.0, not to use the latest Rust 1.60.0 because I have problem compiling Parity's Frontier repo as well: polkadot-evm/frontier#633. Rust 1.59.0 is good to compile that. Thank you