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1st chunk of `doc/manual/source/language/variables.md`
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# Variables

A *variable* is an [identifier](identifiers.md) used as an expression.

> **Syntax**
>
> *expression* → *identifier*

A variable must have the same name as a definition in the [scope](./scope.md) that encloses it.
The value of a variable is the value of the corresponding expression in the enclosing scope.
Title: Variables in the System
Summary
This section defines what a variable is in the system. A variable is an identifier used as an expression and it must have the same name as a definition in the enclosing scope. Its value is the value of the corresponding expression in that scope.