About This Book

This language reference documents the implemented \crexx{} language surface for Release 1 beta 1.

The main release language is Level B: a typed REXX-family systems language compiled by rxc, assembled by rxas, and executed by the RXVM runtime. Level B is not a complete Classic REXX compatibility mode, and this reference does not describe planned future levels as current behaviour.

Audience

This reference is for programmers who need precise syntax and behaviour:

• application and library authors writing Level B source
• contributors changing compiler, library, or VM behaviour
• users inspecting generated RXAS or bytecode
• maintainers checking whether documentation matches the implementation

New users should start with the README, the documentation map, and the programming guide. This book is the detailed reference.

Document Structure

This document is in three parts:

Objectives

Current design goals and the release scope.

Overview

The language model, modules, calls, options, and program structure.

Reference

Syntax and behaviour for types, literals, variables, operators, classes, namespaces, numeric settings, statements, and libraries.