1. jemarch Nov 23, 2025

   The core Algol 68 language is indeed set in stone.

   But we are carefully adding many GNU extensions to the language, as was explicitly allowed by the Revised Report:

     [RR page 52]
     "[...] a superlanguage of ALGOL 68 might be defined by additions to
      the syntax, semantics or standard-prelude, so as to improve
      efficiency or to permit the solution of problems not readily
      amenable to ALGOL 68."
   

   The resulting language, which we call GNU Algol 68, is a strict super-language of Algol 68.

   You can find the extensions currently implemented by GCC listed at https://algol68-lang.org/

2. jemarch Nov 23, 2025

   I would recommend the Informal Introduction to Algol 68, available in PDF at https://algol68-lang.org/resources
3. jemarch Nov 23, 2025

   You can find some modern Algol 68 code, using the modern stropping which is the default in GCC, at https://git.sr.ht/~jemarch/godcc

   Godcc is a command-line interface for Compiler Explorer written in Algol 68.

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