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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

Cargo.lock

The file recording the exact dependency versions a build used.

Cargo.lock records the exact version of every dependency resolved for a build so later builds use the same ones.

Examples

  • After cargo add heck, Cargo.lock records name = "heck", version = "0.5.0" and a checksum, so every later build uses that exact release.

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