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docs: merge builtin-constants into builtins
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# Built-in Constants
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These constants are built into the Nix language evaluator:
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<dl>
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</dl>
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# Built-in Functions
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# Built-ins
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This section lists the functions built into the Nix language evaluator.
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All built-in functions are available through the global [`builtins`](./builtin-constants.md#builtins-builtins) constant.
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This section lists the values and functions built into the Nix language evaluator.
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All built-ins are available through the global [`builtins`](#builtins-builtins) constant.
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For convenience, some built-ins can be accessed directly:
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Some built-ins are also exposed directly in the global scope:
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<!-- TODO(@rhendric, #10970): this list is incomplete -->
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- [`derivation`](#builtins-derivation)
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- [`import`](#builtins-import)
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A lookup path is an identifier with an optional path suffix that resolves to a [path value](@docroot@/language/types.md#type-path) if the identifier matches a search path entry.
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The value of a lookup path is determined by [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath).
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The value of a lookup path is determined by [`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath).
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See [`builtins.findFile`](@docroot@/language/builtins.md#builtins-findFile) for details on lookup path resolution.
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@ -64,7 +64,7 @@ It outputs an attribute set, and produces a [store derivation] as a side effect
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> }
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> ```
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>
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> [`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem) has the value of the [`system` configuration option], and defaults to the system type of the current Nix installation.
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> [`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem) has the value of the [`system` configuration option], and defaults to the system type of the current Nix installation.
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- [`builder`]{#attr-builder} ([Path](@docroot@/language/types.md#type-path) | [String](@docroot@/language/types.md#type-string))
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@ -37,7 +37,7 @@ A _boolean_ in the Nix language is one of _true_ or _false_.
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<!-- TODO: mention the top-level environment -->
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These values are available as attributes of [`builtins`](builtin-constants.md#builtins-builtins) as [`builtins.true`](builtin-constants.md#builtins-true) and [`builtins.false`](builtin-constants.md#builtins-false).
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These values are available as attributes of [`builtins`](builtins.md#builtins-builtins) as [`builtins.true`](builtins.md#builtins-true) and [`builtins.false`](builtins.md#builtins-false).
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The function [`builtins.isBool`](builtins.md#builtins-isBool) can be used to determine if a value is a boolean.
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### String {#type-string}
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<!-- TODO: mention the top-level environment -->
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This value is available as an attribute on the [`builtins`](builtin-constants.md#builtins-builtins) attribute set as [`builtins.null`](builtin-constants.md#builtins-null).
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This value is available as an attribute on the [`builtins`](builtins.md#builtins-builtins) attribute set as [`builtins.null`](builtins.md#builtins-null).
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## Compound values
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