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Update no_main to use the attribute template #1901

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Update no_main to use the attribute template #1901

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9f9e8f0
Update no_main to use the attribute template
ehuss Jun 21, 2025
ebc70f2
Minor update of `no_main`
ehuss Sep 22, 2025
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20 changes: 20 additions & 0 deletions src/crates-and-source-files.md
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Expand Up @@ -130,11 +130,31 @@ When a "foreign" unwind (e.g. an exception thrown from C++ code, or a `panic!` i

For more information, see the [panic documentation][panic-docs].

<!-- template:attributes -->
r[crate.no_main]
### The `no_main` attribute

r[crate.no_main.intro]
The *`no_main` [attribute]* may be applied at the crate level to disable emitting the `main` symbol for an executable binary. This is useful when some other object being linked to defines `main`.

> [!EXAMPLE]
> <!-- ignore: does not work with test framework -->
> ```rust,ignore
> #![no_main]
> ```

r[crate.no_main.syntax]
The `no_main` attribute uses the [MetaWord] syntax.

r[crate.no_main.allowed-positions]
The `no_main` attribute may only be applied to the crate root.

r[crate.no_main.duplicates]
The `no_main` attribute may be used any number of times on the crate root.

> [!NOTE]
> `rustc` lints against any use following the first.

r[crate.crate_name]
## The `crate_name` attribute

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