Document restrictions of the main function #345
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Havvy
changed the title
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This now also documents that trait and lifetime parameters aren't allowed and the newly added restriction of no where clauses. |
matthewjasper
requested changes
May 24, 2018
src/crates-and-source-files.md
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| * `()` | ||
| * `bool` | ||
| * `i32` |
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Bool and i32 don't implement Termination at the moment.
| A crate that contains a `main` function can be compiled to an executable. If a | ||
| `main` function is present, its return type must be `()` | ||
| ("[unit]") and it must take no arguments. | ||
| A crate that contains a `main` [function] can be compiled to an executable. If a |
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Not from this PR, but binary crates are determined by the crate type, not the presence of main.
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There's a lot on that page I don't like, but I wanted to keep this change self-contained.
src/crates-and-source-files.md
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| <!-- `!` --> | ||
| * `Result<T, E> where T: on this list, E: Error` | ||
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| > Note: The implementation of which return types is allowed is the unstable |
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Are allowed.
'Is determined by'?
matthewjasper
approved these changes
May 24, 2018
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Thanks! |
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Also updated a link for attributes and changed the first paragraph to a note.