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Track if a where bound comes from a impl Trait desugar

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With #93803 `impl Trait` function arguments get desugared to hidden
where bounds. However, Clippy needs to know if a bound was originally a
impl Trait or an actual bound. This adds a field to the
`WhereBoundPredicate` struct to keep track of this information during
HIR lowering.
This commit is contained in:
flip1995 2022-05-05 15:50:11 +01:00 • committed by flip1995
parent ed8458f67a
commit bca3d8a6b5
2 changed files with 8 additions and 4 deletions
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6
clippy_lints/src/lifetimes.rs
View file

@ -9,8 +9,8 @@ use rustc_hir::intravisit::{
use rustc_hir::FnRetTy::Return;
use rustc_hir::{
BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, Impl, ImplItem,
ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, TraitBoundModifier,
TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, PredicateOrigin,
TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::hir::nested_filter as middle_nested_filter;
@ -145,7 +145,7 @@ fn check_fn_inner<'tcx>(
.filter(|param| matches!(param.kind, GenericParamKind::Type { .. }));
for typ in types {
for pred in generics.bounds_for_param(cx.tcx.hir().local_def_id(typ.hir_id)) {
if pred.in_where_clause {
if pred.origin == PredicateOrigin::WhereClause {
// has_where_lifetimes checked that this predicate contains no lifetime.
continue;
}

6
clippy_lints/src/trait_bounds.rs
View file

@ -8,7 +8,8 @@ use rustc_data_structures::unhash::UnhashMap;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
use rustc_hir::{
GenericBound, Generics, Item, ItemKind, Node, Path, PathSegment, QPath, TraitItem, Ty, TyKind, WherePredicate,
GenericBound, Generics, Item, ItemKind, Node, Path, PathSegment, PredicateOrigin, QPath, TraitItem, Ty, TyKind,
WherePredicate,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_tool_lint, impl_lint_pass};
@ -95,6 +96,7 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
for predicate in item.generics.predicates {
if_chain! {
if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate;
if bound_predicate.origin != PredicateOrigin::ImplTrait;
if !bound_predicate.span.from_expansion();
if let TyKind::Path(QPath::Resolved(_, Path { segments, .. })) = bound_predicate.bounded_ty.kind;
if let Some(PathSegment {
@ -168,6 +170,7 @@ impl TraitBounds {
for bound in gen.predicates {
if_chain! {
if let WherePredicate::BoundPredicate(ref p) = bound;
if p.origin != PredicateOrigin::ImplTrait;
if p.bounds.len() as u64 <= self.max_trait_bounds;
if !p.span.from_expansion();
if let Some(ref v) = map.insert(
@ -223,6 +226,7 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
for predicate in gen.predicates {
if_chain! {
if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate;
if bound_predicate.origin != PredicateOrigin::ImplTrait;
if !bound_predicate.span.from_expansion();
if let TyKind::Path(QPath::Resolved(_, Path { segments, .. })) = bound_predicate.bounded_ty.kind;
if let Some(segment) = segments.first();