This crate supports no_std conditionally:

But some of its dependencies do not support no_std and pull in std transitively:

• malachite-bigint (version 0.14.0):

  RustPython/crates/codegen/Cargo.toml

  Line 30 in 657bab3

  malachite-bigint = { workspace = true }

• rustpython-ruff_python_ast (version 0.17.1):

  RustPython/crates/codegen/Cargo.toml

  Line 20 in 657bab3

  ruff_python_ast = { workspace = true }

• rustpython-ruff_text_size (version 0.17.1):

  RustPython/crates/codegen/Cargo.toml

  Line 21 in 657bab3

  ruff_text_size = { workspace = true }

As a result, builds targeting bare-metal or other no_std-only targets fail to compile, even though the crate itself contains no direct std usage.