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document #![feature(const_generics_defaults)] #1098

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Feb 8, 2022
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document #![feature(const_generics_defaults)] #1098

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5 changes: 3 additions & 2 deletions src/items/generics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,14 +15,14 @@
> &nbsp;&nbsp; [IDENTIFIER]( `:` [_TypeParamBounds_]<sup>?</sup> )<sup>?</sup> ( `=` [_Type_] )<sup>?</sup>
>
> _ConstParam_:\
> &nbsp;&nbsp; `const` [IDENTIFIER] `:` [_Type_]
> &nbsp;&nbsp; `const` [IDENTIFIER] `:` [_Type_] ( `=` _[Block][block]_ | [IDENTIFIER] | -<sup>?</sup>[LITERAL] )<sup>?</sup>

[Functions], [type aliases], [structs], [enumerations], [unions], [traits], and
[implementations] may be *parameterized* by types, constants, and lifetimes. These
parameters are listed in angle <span class="parenthetical">brackets (`<...>`)</span>,
usually immediately after the name of the item and before its definition. For
implementations, which don't have a name, they come directly after `impl`.
The order of generic parameters is restricted to lifetime parameters, then type parameters, and then const parameters.
The order of generic parameters is restricted to lifetime parameters and then type/const parameters intermixed.

Some examples of items with type, const, and lifetime parameters:

Expand All @@ -31,6 +31,7 @@ fn foo<'a, T>() {}
trait A<U> {}
struct Ref<'a, T> where T: 'a { r: &'a T }
struct InnerArray<T, const N: usize>([T; N]);
struct Uwu<const N: bool, U>(U);
```

Generic parameters are in scope within the item definition where they are
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