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Format async bounds in rustfmt

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This commit is contained in:
Michael Goulet 2024-02-13 16:05:41 +00:00
parent 18f51f79f3
commit bed388348b
2 changed files with 18 additions and 4 deletions
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19
src/types.rs
View File

@ -537,18 +537,29 @@ fn rewrite(&self, context: &RewriteContext<'_>, _: Shape) -> Option<String> {
impl Rewrite for ast::GenericBound {
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
match *self {
ast::GenericBound::Trait(ref poly_trait_ref, modifiers) => {
ast::GenericBound::Trait(
ref poly_trait_ref,
ast::TraitBoundModifiers {
constness,
asyncness,
polarity,
},
) => {
let snippet = context.snippet(self.span());
let has_paren = snippet.starts_with('(') && snippet.ends_with(')');
let mut constness = modifiers.constness.as_str().to_string();
let mut constness = constness.as_str().to_string();
if !constness.is_empty() {
constness.push(' ');
}
let polarity = modifiers.polarity.as_str();
let mut asyncness = asyncness.as_str().to_string();
if !asyncness.is_empty() {
asyncness.push(' ');
}
let polarity = polarity.as_str();
let shape = shape.offset_left(constness.len() + polarity.len())?;
poly_trait_ref
.rewrite(context, shape)
.map(|s| format!("{constness}{polarity}{s}"))
.map(|s| format!("{constness}{asyncness}{polarity}{s}"))
.map(|s| if has_paren { format!("({})", s) } else { s })
}
ast::GenericBound::Outlives(ref lifetime) => lifetime.rewrite(context, shape),

3
tests/target/asyncness.rs Normal file
View File

@ -0,0 +1,3 @@
// rustfmt-edition: 2018
fn foo() -> impl async Fn() {}