bjoernager/rust
bjoernager/rust
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add various coments to explain how the code works

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This commit is contained in:
Niko Matsakis 2021-06-18 11:44:56 -04:00
parent 1989b9a0b5
commit f6adaedd9b
3 changed files with 85 additions and 11 deletions
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12
compiler/rustc_trait_selection/src/opaque_types.rs
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@ -5,7 +5,6 @@ use rustc_data_structures::sync::Lrc;
use rustc_data_structures::vec_map::VecMap;
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::Node;
use rustc_infer::infer::error_reporting::unexpected_hidden_region_diagnostic;
use rustc_infer::infer::free_regions::FreeRegionRelations;
use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
@ -982,8 +981,8 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
let opaque_parent_hir_id = tcx.hir().get_parent_item(opaque_hir_id);
parent_def_id == tcx.hir().local_def_id(opaque_parent_hir_id)
};
let (in_definition_scope, origin) = match tcx.hir().find(opaque_hir_id) {
Some(Node::Item(item)) => match item.kind {
let (in_definition_scope, origin) =
match tcx.hir().expect_item(opaque_hir_id).kind {
// Anonymous `impl Trait`
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
impl_trait_fn: Some(parent),
@ -1000,12 +999,7 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
origin,
),
_ => (def_scope_default(), hir::OpaqueTyOrigin::Misc),
},
_ => bug!(
"expected item, found {}",
tcx.hir().node_to_string(opaque_hir_id),
),
};
};
if in_definition_scope {
let opaque_type_key =
OpaqueTypeKey { def_id: def_id.to_def_id(), substs };