rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Simplify ImplTraitContext

Browse Source
This commit is contained in:
Michael Goulet
2024-03-06 18:44:55 +00:00
parent cf299ddb6e
commit 99df5a2b42
3 changed files with 22 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
compiler/rustc_ast_lowering/src/lib.rs
View File

@@ -265,15 +265,11 @@ enum ImplTraitContext {
/// Example: `fn foo() -> impl Debug`, where `impl Debug` is conceptually
/// equivalent to a new opaque type like `type T = impl Debug; fn foo() -> T`.
///
ReturnPositionOpaqueTy {
/// Origin: Either OpaqueTyOrigin::FnReturn or OpaqueTyOrigin::AsyncFn,
origin: hir::OpaqueTyOrigin,
fn_kind: FnDeclKind,
},
/// Impl trait in type aliases.
TypeAliasesOpaqueTy {
/// Origin: Always OpaqueTyOrigin::TypeAliasImplTrait
OpaqueTy {
origin: hir::OpaqueTyOrigin,
/// Only used to change the lifetime capture rules, since
/// RPITIT captures all in scope, RPIT does not.
fn_kind: Option<FnDeclKind>,
},
/// `impl Trait` is unstably accepted in this position.
FeatureGated(ImplTraitPosition, Symbol),
@@ -1078,9 +1074,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// Disallow ATB in dyn types
if self.is_in_dyn_type {
let suggestion = match itctx {
ImplTraitContext::ReturnPositionOpaqueTy { .. }
| ImplTraitContext::TypeAliasesOpaqueTy { .. }
| ImplTraitContext::Universal => {
ImplTraitContext::OpaqueTy { .. } | ImplTraitContext::Universal => {
let bound_end_span = constraint
.gen_args
.as_ref()
@@ -1420,17 +1414,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
TyKind::ImplTrait(def_node_id, bounds) => {
let span = t.span;
match itctx {
ImplTraitContext::ReturnPositionOpaqueTy { origin, fn_kind } => self
.lower_opaque_impl_trait(
span,
origin,
*def_node_id,
bounds,
Some(fn_kind),
itctx,
),
ImplTraitContext::TypeAliasesOpaqueTy { origin } => self
.lower_opaque_impl_trait(span, origin, *def_node_id, bounds, None, itctx),
ImplTraitContext::OpaqueTy { origin, fn_kind } => self.lower_opaque_impl_trait(
span,
origin,
*def_node_id,
bounds,
fn_kind,
itctx,
),
ImplTraitContext::Universal => {
let span = t.span;
@@ -1824,9 +1815,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
FnDeclKind::Fn
| FnDeclKind::Inherent
| FnDeclKind::Trait
| FnDeclKind::Impl => ImplTraitContext::ReturnPositionOpaqueTy {
| FnDeclKind::Impl => ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(self.local_def_id(fn_node_id)),
fn_kind: kind,
fn_kind: Some(kind),
},
FnDeclKind::ExternFn => {
ImplTraitContext::Disallowed(ImplTraitPosition::ExternFnReturn)
@@ -1920,9 +1911,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
output,
coro,
opaque_ty_span,
ImplTraitContext::ReturnPositionOpaqueTy {
ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
fn_kind,
fn_kind: Some(fn_kind),
},
);
arena_vec![this; bound]