feat: add no-std feature to o1-utils crate #3417
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dannywillems force-pushed the dw/no-std-o1-utils branch from 82922e7 to 7d4a031 Compare 
- Add `no-std` and `std` features to Cargo.toml (std is default) - Add conditional `#![no_std]` attribute to lib.rs - Replace `std::` imports with `core::` equivalents where possible - Add conditional `alloc` crate imports for Vec and other types - Feature-gate std-only modules (serialization, lazy_cache, chunked_evaluations) - Enable o1-utils in no-std CI workflow Closes: o1-labs/mina-rust#1988
dannywillems force-pushed the dw/no-std-o1-utils branch from 7d4a031 to d762640 Compare 6 tasks
richardpringle approved these changes Dec 19, 2025
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Summary
no-stdandstdfeatures to o1-utils crate (std is default)#![no_std]attribute to lib.rsstd::imports withcore::equivalents where possiblealloccrate imports for Vec and other typesserialization(requiresstd::io::BufReader)lazy_cache(requiresstd::sync::Once)chunked_evaluations(depends on serialization)tests(requiresthread_rng)Test plan
cargo check -p o1-utils --features no-std --no-default-featurespasses locallyCloses: o1-labs/mina-rust#1988