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Merge #10202

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10202: fix: Type param hover shows correct sized bounds. r=flodiebold a=iDawer

Closes  #9949

This adds implicit `: Sized` bound to type parameters at lowering step.

Hovering on type parameter does not show it's `: Sized` bound be it set explicitly or implicitly. This is because it doesn't track that the bound was set implicitly.

### Perf

```rust
./target/rust-analyzer-baseline-3dae94bf -q analysis-stats --memory-usage .
Database loaded:     4.51s, 311minstr, 110mb (metadata 1.08s, 22minstr, 743kb; build 3.20s, 8730kinstr, -237kb)
  crates: 38, mods: 770, decls: 17173, fns: 12835
Item Collection:     29.63s, 85ginstr, 372mb
  exprs: 353460, ??ty: 364 (0%), ?ty: 232 (0%), !ty: 144
Inference:           118.25s, 284ginstr, 601mb
Total:               147.88s, 370ginstr, 973mb

./target/rust-analyzer-hover-ty-param-dfb15292 -q analysis-stats --memory-usage .
Database loaded:     4.53s, 311minstr, 110mb (metadata 1.10s, 22minstr, 743kb; build 3.20s, 8672kinstr, -189kb)
  crates: 38, mods: 770, decls: 17173, fns: 12835
Item Collection:     29.59s, 85ginstr, 372mb
  exprs: 353460, ??ty: 364 (0%), ?ty: 232 (0%), !ty: 144
Inference:           121.69s, 296ginstr, 601mb
Total:               151.28s, 382ginstr, 974mb

```

Co-authored-by: Dawer <7803845+iDawer@users.noreply.github.com>
This commit is contained in:
bors[bot] 2021-09-12 07:54:56 +00:00 • committed by GitHub
commit 317059985a
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3 changed files with 201 additions and 21 deletions
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12
crates/hir_ty/src/lower.rs
View file

@ -1024,7 +1024,7 @@ pub(crate) fn generic_predicates_for_param_query(
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
let generics = generics(db.upcast(), param_id.parent);
resolver
let mut predicates: Vec<_> = resolver
.where_predicates_in_scope()
// we have to filter out all other predicates *first*, before attempting to lower them
.filter(|pred| match pred {
@ -1038,7 +1038,15 @@ pub(crate) fn generic_predicates_for_param_query(
WherePredicate::Lifetime { .. } => false,
})
.flat_map(|pred| ctx.lower_where_predicate(pred, true).map(|p| make_binders(&generics, p)))
.collect()
.collect();
let subst = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
let explicitly_unsized_tys = ctx.unsized_types.into_inner();
let implicitly_sized_predicates =
implicitly_sized_clauses(db, param_id.parent, &explicitly_unsized_tys, &subst, &resolver)
.map(|p| make_binders(&generics, crate::wrap_empty_binders(p)));
predicates.extend(implicitly_sized_predicates);
predicates.into()
}
pub(crate) fn generic_predicates_for_param_recover(