chore: Update Rust toolchain to v1.98 - #46
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Repin the fenix toolchain hash in flake.nix; without it every nix build fails on a hash mismatch against the 1.92 pin. Adopt build.warnings, stabilized in 1.97, in place of the two -D warnings mechanisms. It applies to local packages only, so a warning in blake3 or lean-ffi no longer fails the build, and it stays out of RUSTFLAGS, so it no longer invalidates the dependency build cache.
Adopt the same arrangement as lean-ffi: the lint set lives in the manifest so it applies to every cargo invocation, and CARGO_BUILD_WARNINGS promotes local-package warnings to errors in CI and in the flake's clippy check. Local builds warn rather than fail. That empties rust/.cargo/config.toml, so remove it.
The manifest moved to 93c7e529 while the lock still recorded 2a9c91eb. Crane vendors from the lock, so the sandboxed cargo check found no vendored source for the pinned rev and tried to fetch it over the network, which the Nix build sandbox denies.
arthurpaulino
approved these changes
Aug 22, 2026
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