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Abstract syntax tree

<compiler> (AST) A data structure representing something which has been parsed, often used as a compiler or interpreter's internal representation of a program while it is being optimised and from which code generation is performed.

The range of all possible such structures is described by the abstract syntax.

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abstraction abstract machine Abstract Machine Notation abstract syntax Abstract Syntax Notation 1	abstract syntax concrete syntax Eiffel source checker GMD Toolbox for Compiler Construction interpreter	Abstract-Type and Scheme-Definition Language Abstract Windowing Toolkit Abstract Window Toolkit ABSYS AC2