Echo 2026

Language edition and canonical public Language Spec. The suite under echo26/ is the executable contract.

What Echo 2026 is

Echo 2026 is this language edition: the name of the surface you implement and ship against today. The canonical public Language Spec for the edition lives here on the site. Form-by-form rules are published under /docs. Narrative chapters are at /book.

Executable contract

echo26/ holds small programs and expected artifacts: the machine-checked contract of Echo 2026. The runner CLI is e26 (short tooling name); point it at xo or any compatible candidate binary. Language work keeps the suite green, next to crate tests and examples/.

Pages

Language Spec: table of contents for public rules (Reference pages and suite areas). Run: invoke the suite. Layout: fixture file naming. Protocol: what a candidate binary must answer.