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docs: add variables; rework scope (#11062)

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Co-authored-by: Valentin Gagarin <valentin@gagarin.work>
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Ryan Hendrickson 2024-07-31 17:39:43 -04:00 • committed by GitHub
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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.