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An `Expr` represents (the parse tree of) an expression in E0.
Our internal representation of a BinOp
in the E0 language.
Our internal representation of a IfZero expr
in the E0 language.
Our internal representation of a number in the E0 language.
Our internal representation of a Paren
in the E0 language.
Abstract class Value -
The type of all Expressions which self-evaluate:
Numbers, and (later, in E3) functions.
A class to represent two values.
The test class UtilIanTest.