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Avoid iterating over hashmaps in astconv #117828

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Merged
merged 1 commit into from
Nov 20, 2023
Merged

Avoid iterating over hashmaps in astconv #117828

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10 changes: 4 additions & 6 deletions compiler/rustc_hir_analysis/src/astconv/errors.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ use crate::errors::{
ParenthesizedFnTraitExpansion,
};
use crate::traits::error_reporting::report_object_safety_error;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap, FxIndexSet};
use rustc_errors::{pluralize, struct_span_err, Applicability, Diagnostic, ErrorGuaranteed};
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
Expand All @@ -16,8 +16,6 @@ use rustc_span::symbol::{sym, Ident};
use rustc_span::{Span, Symbol, DUMMY_SP};
use rustc_trait_selection::traits::object_safety_violations_for_assoc_item;

use std::collections::BTreeSet;

impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
/// On missing type parameters, emit an E0393 error and provide a structured suggestion using
/// the type parameter's name as a placeholder.
Expand Down Expand Up @@ -504,7 +502,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
/// emit a generic note suggesting using a `where` clause to constraint instead.
pub(crate) fn complain_about_missing_associated_types(
&self,
associated_types: FxHashMap<Span, BTreeSet<DefId>>,
associated_types: FxIndexMap<Span, FxIndexSet<DefId>>,
potential_assoc_types: Vec<Span>,
trait_bounds: &[hir::PolyTraitRef<'_>],
) {
Expand All @@ -514,13 +512,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let tcx = self.tcx();
// FIXME: Marked `mut` so that we can replace the spans further below with a more
// appropriate one, but this should be handled earlier in the span assignment.
let mut associated_types: FxHashMap<Span, Vec<_>> = associated_types
let mut associated_types: FxIndexMap<Span, Vec<_>> = associated_types
.into_iter()
.map(|(span, def_ids)| {
(span, def_ids.into_iter().map(|did| tcx.associated_item(did)).collect())
})
.collect();
let mut names: FxHashMap<String, Vec<Symbol>> = Default::default();
let mut names: FxIndexMap<String, Vec<Symbol>> = Default::default();
let mut names_len = 0;

// Account for things like `dyn Foo + 'a`, like in tests `issue-22434.rs` and
Expand Down
6 changes: 2 additions & 4 deletions compiler/rustc_hir_analysis/src/astconv/object_safety.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
use crate::astconv::{GenericArgCountMismatch, GenericArgCountResult, OnlySelfBounds};
use crate::bounds::Bounds;
use crate::errors::TraitObjectDeclaredWithNoTraits;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
use rustc_errors::struct_span_err;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
Expand All @@ -14,7 +14,6 @@ use rustc_trait_selection::traits::error_reporting::report_object_safety_error;
use rustc_trait_selection::traits::{self, astconv_object_safety_violations};

use smallvec::{smallvec, SmallVec};
use std::collections::BTreeSet;

use super::AstConv;

Expand Down Expand Up @@ -148,8 +147,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
}
}

// Use a `BTreeSet` to keep output in a more consistent order.
let mut associated_types: FxHashMap<Span, BTreeSet<DefId>> = FxHashMap::default();
let mut associated_types: FxIndexMap<Span, FxIndexSet<DefId>> = FxIndexMap::default();

let regular_traits_refs_spans = trait_bounds
.into_iter()
Expand Down
4 changes: 2 additions & 2 deletions tests/ui/associated-types/missing-associated-types.stderr
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Expand Up @@ -49,7 +49,7 @@ LL | type B;
LL | type Bar<Rhs> = dyn Add<Rhs> + Sub<Rhs> + X<Rhs> + Z<Rhs>;
| ^^^^^^^^ ^^^^^^^^ ^^^^^^ ^^^^^^ associated types `A`, `B`, `Output` must be specified
| | | |
| | | associated types `Output` (from trait `Mul`), `Output` (from trait `Div`) must be specified
| | | associated types `Output` (from trait `Div`), `Output` (from trait `Mul`) must be specified
| | associated type `Output` must be specified
| associated type `Output` must be specified
|
Expand Down Expand Up @@ -119,7 +119,7 @@ error[E0191]: the value of the associated types `Output` in `Div`, `Output` in `
--> $DIR/missing-associated-types.rs:24:21
|
LL | type Bal<Rhs> = dyn X<Rhs>;
| ^^^^^^ associated types `Output` (from trait `Mul`), `Output` (from trait `Div`) must be specified
| ^^^^^^ associated types `Output` (from trait `Div`), `Output` (from trait `Mul`) must be specified
|
= help: consider introducing a new type parameter, adding `where` constraints using the fully-qualified path to the associated types

Expand Down