Echo 2026

Protocol

Commands a candidate binary must answer for Echo 2026 conformance.

Stages

e26 compares stdout and stderr to the fixture sidecars:

$binary lex --kinds --diag-codes path.echo
  stdout → .lex    stderr → .diag

$binary ast --kinds --diag-codes path.echo
  stdout → .ast

$binary check --diag-codes path.echo
  stderr → .check   # sem-* only; omit if none

$binary run path.echo
  stdout → .run     exit → .runexit

Edition Spec: /e26/spec. Layout: /e26/layout. Run: /e26/run. Reference forms: /docs.