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Say that that the default function return type is the unit type #1199

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May 2, 2022
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Say that that the default function return type is the unit type #1199

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functions.md: one sentence per line for the first section
mattheww May 1, 2022
42dc534
functions.md: state that the default return type is the unit type
mattheww May 1, 2022
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16 changes: 7 additions & 9 deletions src/items/functions.md
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Expand Up @@ -42,16 +42,13 @@
> [^fn-param-2015]: Function parameters with only a type are only allowed
> in an associated function of a [trait item] in the 2015 edition.

A _function_ consists of a [block], along with a name and a set of parameters.
Other than a name, all these are optional. Functions are declared with the
keyword `fn`. Functions may declare a set of *input* [*variables*][variables]
as parameters, through which the caller passes arguments into the function, and
the *output* [*type*][type] of the value the function will return to its caller
on completion.
A _function_ consists of a [block], along with a name, a set of parameters, and an output type.
Other than a name, all these are optional.
Functions are declared with the keyword `fn`.
Functions may declare a set of *input* [*variables*][variables] as parameters, through which the caller passes arguments into the function, and the *output* [*type*][type] of the value the function will return to its caller on completion.
If the output type is not explicitly stated, it is the [unit type].

When referred to, a _function_ yields a first-class *value* of the
corresponding zero-sized [*function item type*], which
when called evaluates to a direct call to the function.
When referred to, a _function_ yields a first-class *value* of the corresponding zero-sized [*function item type*], which when called evaluates to a direct call to the function.

For example, this is a simple function:
```rust
Expand Down Expand Up @@ -391,6 +388,7 @@ fn foo_oof(#[some_inert_attribute] arg: u8) {
[block]: ../expressions/block-expr.md
[variables]: ../variables.md
[type]: ../types.md#type-expressions
[unit type]: ../types/tuple.md
[*function item type*]: ../types/function-item.md
[Trait]: traits.md
[attributes]: ../attributes.md
Expand Down