Odin Lang · 4fuu bundle Version-aware guidance for practical Odin development. Use whenever a task mentions Odin, .odin files, Odin packages or import collections, odin build/run/check/test/doc, compiler or linker errors, core: or vendor: APIs, FFI, Odin language features, or project setup—even when Odin is only part of a larger task. Locates the active toolchain and matching docs/examples, explains core syntax and semantics with compiler-checked examples, guides idiomatic edits, and verifies changes without assuming an OS, editor, framework, or application domain.