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Display generic arguments for associated types

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Ryo Yoshida 2022-10-27 17:05:22 +09:00
parent 1fe10bff1d
commit 4dd694371a
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3 changed files with 78 additions and 17 deletions
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28
crates/hir-ty/src/tls.rs
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@ -5,7 +5,7 @@ use itertools::Itertools;
use crate::{
chalk_db, db::HirDatabase, from_assoc_type_id, from_chalk_trait_id, mapping::from_chalk,
CallableDefId, Interner,
CallableDefId, Interner, ProjectionTyExt,
};
use hir_def::{AdtId, ItemContainerId, Lookup, TypeAliasId};
@ -63,17 +63,31 @@ impl DebugContext<'_> {
ItemContainerId::TraitId(t) => t,
_ => panic!("associated type not in trait"),
};
let trait_data = self.0.trait_data(trait_);
let params = projection_ty.substitution.as_slice(Interner);
write!(fmt, "<{:?} as {}", &params[0], trait_data.name,)?;
if params.len() > 1 {
let trait_name = &self.0.trait_data(trait_).name;
let trait_ref = projection_ty.trait_ref(self.0);
let trait_params = trait_ref.substitution.as_slice(Interner);
let self_ty = trait_ref.self_type_parameter(Interner);
write!(fmt, "<{:?} as {}", self_ty, trait_name)?;
if trait_params.len() > 1 {
write!(
fmt,
"<{}>",
&params[1..].iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
trait_params[1..].iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
)?;
}
write!(fmt, ">::{}", type_alias_data.name)
write!(fmt, ">::{}", type_alias_data.name)?;
let proj_params_count = projection_ty.substitution.len(Interner) - trait_params.len();
let proj_params = &projection_ty.substitution.as_slice(Interner)[..proj_params_count];
if !proj_params.is_empty() {
write!(
fmt,
"<{}>",
proj_params.iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
)?;
}
Ok(())
}
pub(crate) fn debug_fn_def_id(