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Bring back the colon separators for the macro munching.

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Co-Authored-By: Ibraheem Ahmed <ibrah1440@gmail.com>
This commit is contained in:
Daniel Henry-Mantilla 2021-12-09 20:12:01 +01:00
parent 846cb9c583
commit 07bcf4aad3
1 changed files with 12 additions and 12 deletions
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24
library/core/src/future/join.rs
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@ -48,9 +48,9 @@ use crate::task::{Context, Poll};
pub macro join( $($fut:expr),+ $(,)? ) {
// Funnel through an internal macro not to leak implementation details.
join_internal! {
current_position[]
futures_and_positions[]
munching[ $($fut)+ ]
current_position: []
futures_and_positions: []
munching: [ $($fut)+ ]
}
}
@ -64,29 +64,29 @@ macro join_internal {
// Recursion step: map each future with its "position" (underscore count).
(
// Accumulate a token for each future that has been expanded: "_ _ _".
current_position[
current_position: [
$($underscores:tt)*
]
// Accumulate Futures and their positions in the tuple: `_0th () _1st ( _ ) …`.
futures_and_positions[
futures_and_positions: [
$($acc:tt)*
]
// Munch one future.
munching[
munching: [
$current:tt
$($rest:tt)*
]
) => (
join_internal! {
current_position[
current_position: [
$($underscores)*
_
]
futures_and_positions[
futures_and_positions: [
$($acc)*
$current ( $($underscores)* )
]
munching[
munching: [
$($rest)*
]
}
@ -94,14 +94,14 @@ macro join_internal {
// End of recursion: generate the output future.
(
current_position $_:tt
futures_and_positions[
current_position: $_:tt
futures_and_positions: [
$(
$fut_expr:tt ( $($pos:tt)* )
)*
]
// Nothing left to munch.
munching[]
munching: []
) => (
match ( $( MaybeDone::Future($fut_expr), )* ) { futures => async {
let mut futures = futures;