Test command

cargo test --target target.json -Z build-std=core --no-run

Error:

error: duplicate lang item in crate `core` (which `rustc_std_workspace_core` depends on): `sized`.
  |
  = note: the lang item is first defined in crate `core` (which `foo` depends on)
  = note: first definition in `core` loaded from /Users/txku/projects/foo/target/target/debug/deps/libcore-537b20fcb96fe124.rlib
  = note: second definition in `core` loaded from /Users/txku/projects/foo/target/target/debug/deps/libcore-82e4bc7133bc00e1.rlib, /Users/txku/projects/foo/target/target/debug/deps/libcore-82e4bc7133bc00e1.rmeta
...

rustc +nightly -V

rustc 1.62.0-nightly (8bf93e9b6 2022-04-09)

cargo -V

cargo 1.62.0-nightly (e2e2dddeb 2022-04-05)

rustup show

Default host: aarch64-apple-darwin rustup home: /Users/txku/.rustup

installed toolchains

stable-aarch64-apple-darwin (default) nightly-aarch64-apple-darwin

installed targets for active toolchain

aarch64-apple-darwin thumbv7em-none-eabihf

active toolchain

nightly-aarch64-apple-darwin (directory override for '/Users/txku/projects/foo') rustc 1.62.0-nightly (8bf93e9b6 2022-04-09)