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rustdoc: Show that repeated expression arrays can be made with constant values #108531

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bors merged 2 commits into from
Mar 1, 2023
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rustdoc: Show that repeated expression arrays can be made with constant values #108531

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dc97326
Update docs to show [expr; N] can repeat const expr
Coca162 Feb 27, 2023
22b65fc
Clarify that Copy is a trait in array docs
Coca162 Feb 27, 2023
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6 changes: 4 additions & 2 deletions library/core/src/primitive_docs.rs
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Expand Up @@ -587,8 +587,10 @@ mod prim_pointer {}
/// There are two syntactic forms for creating an array:
///
/// * A list with each element, i.e., `[x, y, z]`.
/// * A repeat expression `[x; N]`, which produces an array with `N` copies of `x`.
/// The type of `x` must be [`Copy`].
/// * A repeat expression `[expr; N]` where `N` is how many times to repeat `expr` in the array. `expr` must either be:
///
/// * A value of type `Copy`
/// * A `const` value
///
/// Note that `[expr; 0]` is allowed, and produces an empty array.
/// This will still evaluate `expr`, however, and immediately drop the resulting value, so
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6 changes: 4 additions & 2 deletions library/std/src/primitive_docs.rs
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Expand Up @@ -587,8 +587,10 @@ mod prim_pointer {}
/// There are two syntactic forms for creating an array:
///
/// * A list with each element, i.e., `[x, y, z]`.
/// * A repeat expression `[x; N]`, which produces an array with `N` copies of `x`.
/// The type of `x` must be [`Copy`].
/// * A repeat expression `[expr; N]` where `N` is how many times to repeat `expr` in the array. `expr` must either be:
///
/// * A value of type `Copy`
/// * A `const` value
///
/// Note that `[expr; 0]` is allowed, and produces an empty array.
/// This will still evaluate `expr`, however, and immediately drop the resulting value, so
Expand Down