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Don't write trailing whitespace when formatting empty GenericPredicates

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This commit is contained in:
Lukas Wirth 2021-02-20 20:43:04 +01:00
parent 9e5192d917
commit 0799288f01
3 changed files with 24 additions and 14 deletions
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29
crates/hir_ty/src/display.rs
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@ -467,8 +467,7 @@ impl HirDisplay for ApplicationTy {
.as_ref()
.map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
let bounds = data.subst(&self.parameters);
write!(f, "impl ")?;
write_bounds_like_dyn_trait(&bounds.value, f)?;
write_bounds_like_dyn_trait_with_prefix("impl", &bounds.value, f)?;
// FIXME: it would maybe be good to distinguish this from the alias type (when debug printing), and to show the substitution
}
OpaqueTyId::AsyncBlockTypeImplTrait(..) => {
@ -548,10 +547,10 @@ impl HirDisplay for Ty {
write!(f, "{}", param_data.name.clone().unwrap_or_else(Name::missing))?
}
TypeParamProvenance::ArgumentImplTrait => {
write!(f, "impl ")?;
let bounds = f.db.generic_predicates_for_param(*id);
let substs = Substs::type_params_for_generics(&generics);
write_bounds_like_dyn_trait(
write_bounds_like_dyn_trait_with_prefix(
"impl",
&bounds.iter().map(|b| b.clone().subst(&substs)).collect::<Vec<_>>(),
f,
)?;
@ -560,8 +559,7 @@ impl HirDisplay for Ty {
}
Ty::Bound(idx) => write!(f, "?{}.{}", idx.debruijn.depth(), idx.index)?,
Ty::Dyn(predicates) => {
write!(f, "dyn ")?;
write_bounds_like_dyn_trait(predicates, f)?;
write_bounds_like_dyn_trait_with_prefix("dyn", predicates, f)?;
}
Ty::Opaque(opaque_ty) => {
match opaque_ty.opaque_ty_id {
@ -572,8 +570,7 @@ impl HirDisplay for Ty {
.as_ref()
.map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
let bounds = data.subst(&opaque_ty.parameters);
write!(f, "impl ")?;
write_bounds_like_dyn_trait(&bounds.value, f)?;
write_bounds_like_dyn_trait_with_prefix("impl", &bounds.value, f)?;
}
OpaqueTyId::AsyncBlockTypeImplTrait(..) => {
write!(f, "{{async block}}")?;
@ -627,7 +624,21 @@ fn fn_traits(db: &dyn DefDatabase, trait_: TraitId) -> impl Iterator<Item = Trai
ArrayVec::from(fn_traits).into_iter().flatten().flat_map(|it| it.as_trait())
}
pub fn write_bounds_like_dyn_trait(
pub fn write_bounds_like_dyn_trait_with_prefix(
prefix: &str,
predicates: &[GenericPredicate],
f: &mut HirFormatter,
) -> Result<(), HirDisplayError> {
write!(f, "{}", prefix)?;
if !predicates.is_empty() {
write!(f, " ")?;
write_bounds_like_dyn_trait(predicates, f)
} else {
Ok(())
}
}
fn write_bounds_like_dyn_trait(
predicates: &[GenericPredicate],
f: &mut HirFormatter,
) -> Result<(), HirDisplayError> {