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Add restriction for cfg_attr with crate_type and crate_name #1649

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Oct 22, 2024
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Add restriction for cfg_attr with crate_type and crate_name #1649

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4 changes: 4 additions & 0 deletions src/conditional-compilation.md
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Expand Up @@ -339,6 +339,8 @@ fn bewitched() {}

The `cfg_attr` attribute is allowed anywhere attributes are allowed.

The [`crate_type`] and [`crate_name`] attributes cannot be used with `cfg_attr`.

### The `cfg` macro

The built-in `cfg` macro takes in a single configuration predicate and evaluates
Expand Down Expand Up @@ -369,6 +371,8 @@ println!("I'm running on a {} machine!", machine_kind);
[`cfg`]: #the-cfg-attribute
[`cfg` macro]: #the-cfg-macro
[`cfg_attr`]: #the-cfg_attr-attribute
[`crate_name`]: crates-and-source-files.md#the-crate_name-attribute
[`crate_type`]: linkage.md
[`target_feature` attribute]: attributes/codegen.md#the-target_feature-attribute
[attribute]: attributes.md
[attributes]: attributes.md
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