Rollup merge of rust-lang#139751 - frank-king:feature/pin-project, r=Nadrieril,traviscross

Implement pin-project in pattern matching for `&pin mut|const T`

This PR implements part of rust-lang#130494. It supports pin-project in pattern matching for `&pin mut|const T`.

~Pin-projection by field access (i.e. `&pin mut|const place.field`) is not fully supported yet since pinned-borrow is not ready (rust-lang#135731).~

CC ``````@traviscross``````

Author: matthiaskrgr

clippy_lints/src/index_refutable_slice.rs

@@ -94,7 +94,7 @@ fn find_slice_values(cx: &LateContext<'_>, pat: &hir::Pat<'_>) -> FxIndexMap<Hir
         // We'll just ignore mut and ref mut for simplicity sake right now
         if let hir::PatKind::Binding(hir::BindingMode(by_ref, hir::Mutability::Not), value_hir_id, ident, sub_pat) =
             pat.kind
-            && by_ref != hir::ByRef::Yes(hir::Mutability::Mut)
+            && !matches!(by_ref, hir::ByRef::Yes(_, hir::Mutability::Mut))
         {
             // This block catches bindings with sub patterns. It would be hard to build a correct suggestion
             // for them and it's likely that the user knows what they are doing in such a case.

clippy_lints/src/matches/match_as_ref.rs

@@ -63,7 +63,7 @@ fn is_ref_some_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> Option<Mutability> {
             .qpath_res(qpath, arm.pat.hir_id)
             .ctor_parent(cx)
             .is_lang_item(cx, LangItem::OptionSome)
-        && let PatKind::Binding(BindingMode(ByRef::Yes(mutabl), _), .., ident, _) = first_pat.kind
+        && let PatKind::Binding(BindingMode(ByRef::Yes(_, mutabl), _), .., ident, _) = first_pat.kind
         && let ExprKind::Call(e, [arg]) = peel_blocks(arm.body).kind
         && e.res(cx).ctor_parent(cx).is_lang_item(cx, LangItem::OptionSome)
         && let ExprKind::Path(QPath::Resolved(_, path2)) = arg.kind

clippy_lints/src/matches/needless_match.rs

@@ -172,7 +172,7 @@ fn pat_same_as_expr(pat: &Pat<'_>, expr: &Expr<'_>) -> bool {
                 },
             )),
         ) => {
-            return !matches!(annot, BindingMode(ByRef::Yes(_), _)) && pat_ident.name == first_seg.ident.name;
+            return !matches!(annot, BindingMode(ByRef::Yes(..), _)) && pat_ident.name == first_seg.ident.name;
         },
         // Example: `Custom::TypeA => Custom::TypeB`, or `None => None`
         (

clippy_lints/src/matches/redundant_guards.rs

@@ -176,7 +176,7 @@ fn get_pat_binding<'tcx>(
             if let PatKind::Binding(bind_annot, hir_id, ident, _) = pat.kind
                 && hir_id == local
             {
-                if matches!(bind_annot.0, rustc_ast::ByRef::Yes(_)) {
+                if matches!(bind_annot.0, rustc_ast::ByRef::Yes(..)) {
                     let _ = byref_ident.insert(ident);
                 }
                 // the second call of `replace()` returns a `Some(span)`, meaning a multi-binding pattern

clippy_lints/src/methods/clone_on_copy.rs

@@ -57,7 +57,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, receiver: &Expr<'_>)
                 _ => false,
             },
             // local binding capturing a reference
-            Node::LetStmt(l) if matches!(l.pat.kind, PatKind::Binding(BindingMode(ByRef::Yes(_), _), ..)) => {
+            Node::LetStmt(l) if matches!(l.pat.kind, PatKind::Binding(BindingMode(ByRef::Yes(..), _), ..)) => {
                 return;
             },
             _ => false,

clippy_lints/src/question_mark.rs

@@ -150,7 +150,7 @@ fn check_let_some_else_return_none(cx: &LateContext<'_>, stmt: &Stmt<'_>) {
         let init_expr_str = Sugg::hir_with_applicability(cx, init_expr, "..", &mut applicability).maybe_paren();
         // Take care when binding is `ref`
         let sugg = if let PatKind::Binding(
-            BindingMode(ByRef::Yes(ref_mutability), binding_mutability),
+            BindingMode(ByRef::Yes(_,ref_mutability), binding_mutability),
             _hir_id,
             ident,
             subpattern,
@@ -169,7 +169,7 @@ fn check_let_some_else_return_none(cx: &LateContext<'_>, stmt: &Stmt<'_>) {
             // Handle subpattern (@ subpattern)
             let maybe_subpattern = match subpattern {
                 Some(Pat {
-                    kind: PatKind::Binding(BindingMode(ByRef::Yes(_), _), _, subident, None),
+                    kind: PatKind::Binding(BindingMode(ByRef::Yes(..), _), _, subident, None),
                     ..
                 }) => {
                     // avoid `&ref`
@@ -504,8 +504,8 @@ fn check_if_let_some_or_err_and_early_return<'tcx>(cx: &LateContext<'tcx>, expr:
         let receiver_str = snippet_with_applicability(cx, let_expr.span, "..", &mut applicability);
         let requires_semi = matches!(cx.tcx.parent_hir_node(expr.hir_id), Node::Stmt(_));
         let method_call_str = match by_ref {
-            ByRef::Yes(Mutability::Mut) => ".as_mut()",
-            ByRef::Yes(Mutability::Not) => ".as_ref()",
+            ByRef::Yes(_, Mutability::Mut) => ".as_mut()",
+            ByRef::Yes(_, Mutability::Not) => ".as_ref()",
             ByRef::No => "",
         };
         let sugg = format!(

clippy_lints/src/toplevel_ref_arg.rs

@@ -61,7 +61,7 @@ impl<'tcx> LateLintPass<'tcx> for ToplevelRefArg {
     ) {
         if !matches!(k, FnKind::Closure) {
             for arg in iter_input_pats(decl, body) {
-                if let PatKind::Binding(BindingMode(ByRef::Yes(_), _), ..) = arg.pat.kind
+                if let PatKind::Binding(BindingMode(ByRef::Yes(..), _), ..) = arg.pat.kind
                     && is_lint_allowed(cx, REF_PATTERNS, arg.pat.hir_id)
                     && !arg.span.in_external_macro(cx.tcx.sess.source_map())
                 {
@@ -80,7 +80,7 @@ impl<'tcx> LateLintPass<'tcx> for ToplevelRefArg {
 
     fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
         if let StmtKind::Let(local) = stmt.kind
-            && let PatKind::Binding(BindingMode(ByRef::Yes(mutabl), _), .., name, None) = local.pat.kind
+            && let PatKind::Binding(BindingMode(ByRef::Yes(_, mutabl), _), .., name, None) = local.pat.kind
             && let Some(init) = local.init
             // Do not emit if clippy::ref_patterns is not allowed to avoid having two lints for the same issue.
             && is_lint_allowed(cx, REF_PATTERNS, local.pat.hir_id)

clippy_lints/src/utils/author.rs

@@ -743,10 +743,14 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
                 let ann = match ann {
                     BindingMode::NONE => "NONE",
                     BindingMode::REF => "REF",
+                    BindingMode::REF_PIN => "REF_PIN",
                     BindingMode::MUT => "MUT",
                     BindingMode::REF_MUT => "REF_MUT",
+                    BindingMode::REF_PIN_MUT => "REF_PIN_MUT",
                     BindingMode::MUT_REF => "MUT_REF",
+                    BindingMode::MUT_REF_PIN => "MUT_REF_PIN",
                     BindingMode::MUT_REF_MUT => "MUT_REF_MUT",
+                    BindingMode::MUT_REF_PIN_MUT => "MUT_REF_PIN_MUT",
                 };
                 kind!("Binding(BindingMode::{ann}, _, {name}, {sub})");
                 self.ident(name);

clippy_utils/src/eager_or_lazy.rs

@@ -211,7 +211,12 @@ fn expr_eagerness<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessS
 
                 // Custom `Deref` impl might have side effects
                 ExprKind::Unary(UnOp::Deref, e)
-                    if self.cx.typeck_results().expr_ty(e).builtin_deref(true).is_none() =>
+                    if self
+                        .cx
+                        .typeck_results()
+                        .expr_ty(e)
+                        .builtin_deref(true)
+                        .is_none() =>
                 {
                     self.eagerness |= NoChange;
                 },

clippy_utils/src/lib.rs

@@ -782,7 +782,7 @@ pub fn capture_local_usage(cx: &LateContext<'_>, e: &Expr<'_>) -> CaptureKind {
             ByRef::No if !is_copy(cx, cx.typeck_results().node_type(id)) => {
                 capture = CaptureKind::Value;
             },
-            ByRef::Yes(Mutability::Mut) if capture != CaptureKind::Value => {
+            ByRef::Yes(_, Mutability::Mut) if capture != CaptureKind::Value => {
                 capture = CaptureKind::Ref(Mutability::Mut);
             },
             _ => (),
@@ -1830,7 +1830,7 @@ pub fn is_expr_identity_of_pat(cx: &LateContext<'_>, pat: &Pat<'_>, expr: &Expr<
         .typeck_results()
         .pat_binding_modes()
         .get(pat.hir_id)
-        .is_some_and(|mode| matches!(mode.0, ByRef::Yes(_)))
+        .is_some_and(|mode| matches!(mode.0, ByRef::Yes(..)))
     {
         // If the parameter is `(x, y)` of type `&(T, T)`, or `[x, y]` of type `&[T; 2]`, then
         // due to match ergonomics, the inner patterns become references. Don't consider this