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originally a subset of Lean, designed to be an experimental
intermediate language and used to study the graphrewriting model. To help focus on the essential
implementation issues it deliberately lacked all syntacticsugar, even infix expressions or complex lists,
As it was used more and more to construct all kinds of
applications it was eventually turned into a general purpose
functional programming language, first released in May 1995.
The new language is strongly typed (Milner/Mycroft type
system), provides modules and functional I/O (including a
WIMP interface), and supports parallel processing and
architectures. Parallel execution was originally based on the
It is one of the fastest implementations of functional
languages available, partly aided by programmer annotations
to influence evaluation order.
Although the two variants of Clean are rather different, the
name Clean can be used to denote either of them. To
distinguish, the old version can be referred to as Clean 0.8,
and the new as Clean 1.0 or Concurrent Clean.
The current release of Clean (1.0) includes a compiler,
producing code for the ABC abstract machine, a codegenerator, compiling the ABC code into either object-code
or assembly language (depending on the platform), I/O
libraries, a development environment (not all platforms),
and documentation. It is supported (or will soon be
supported) under Mac OS, Linux, OS/2, Windows 95,