error[E0557]: feature has been removed|#![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]

[vizvasrj]

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• This is not a support question.

Description of bug

info: aborting installation
rustc 1.69.0 (84c898d65 2023-04-16)
info: using existing install for 'stable-x86_64-unknown-linux-gnu'
info: default toolchain set to 'stable-x86_64-unknown-linux-gnu'

stable-x86_64-unknown-linux-gnu unchanged - rustc 1.69.0 (84c898d65 2023-04-16)

info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
info: checking for self-updates

stable-x86_64-unknown-linux-gnu unchanged - rustc 1.69.0 (84c898d65 2023-04-16)
nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.71.0-nightly (7f94b314c 2023-04-23)

info: cleaning up downloads & tmp directories
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'

nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.71.0-nightly (7f94b314c 2023-04-23)

info: checking for self-updates
info: component 'rust-std' for target 'wasm32-unknown-unknown' is up to date
Default host: x86_64-unknown-linux-gnu
rustup home: /home/vizvasrj/.rustup

installed toolchains

stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu

active toolchain

stable-x86_64-unknown-linux-gnu (default)
rustc 1.69.0 (84c898d65 2023-04-16)

Default host: x86_64-unknown-linux-gnu
rustup home: /home/vizvasrj/.rustup

installed toolchains

stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu

installed targets for active toolchain

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

active toolchain

nightly-x86_64-unknown-linux-gnu (overridden by +toolchain on the command line)
rustc 1.71.0-nightly (7f94b314c 2023-04-23)

Steps to reproduce

git clone https://github.com/substrate-developer-hub/substrate-node-template

cd substrate-node-template
git switch -c my-wip-branch
cargo build --release

Compiling sp-core-hashing v5.0.0 (https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.40#ba87188c)
     Compiling sp-io v7.0.0 (https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.40#ba87188c)
  error[E0557]: feature has been removed
    --> /home/vizvasrj/.cargo/git/checkouts/substrate-7e08433d4c370a21/ba87188/primitives/io/src/lib.rs:22:43
     |
  22 | #![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]
     |                                           ^^^^^^^^^^^^^^^^^^^ feature has been removed
     |
     = note: now handled by panic handler

     Compiling sp-weights v4.0.0 (https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.40#ba87188c)
     Compiling blake2 v0.10.6
  error: cannot find attribute `alloc_error_handler` in this scope
      --> /home/vizvasrj/.cargo/git/checkouts/substrate-7e08433d4c370a21/ba87188/primitives/io/src/lib.rs:1657:3
       |
  1657 | #[alloc_error_handler]
       |   ^^^^^^^^^^^^^^^^^^^

     Compiling fs-err v2.9.0
  For more information about this error, try `rustc --explain E0557`.
  error: could not compile `sp-io` (lib) due to 2 previous errors
  warning: build failed, waiting for other jobs to finish...
warning: build failed, waiting for other jobs to finish...
    Building [=======================> ] 947/959: librocksdb-sys(build)

[jetsonx]

Im getting the same issue

[bkchr]

Either downgrade your rustc compiler version to 1.68.0 (as well for the nightly) or use Substrate master with the following pr that solves the problem: #13580