[gcc/devel/rust/master] Add capture tracking to the type info for closures

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:3573ec082f12440a42fa1bf6fdafc578d280870c

commit 3573ec082f12440a42fa1bf6fdafc578d280870c
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Fri Oct 21 15:39:52 2022 +0100

    Add capture tracking to the type info for closures

Diff:
---
 gcc/rust/typecheck/rust-hir-type-check-expr.cc |  4 +++-
 gcc/rust/typecheck/rust-tyty.cc                |  5 ++---
 gcc/rust/typecheck/rust-tyty.h                 | 11 +++++++++--
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/gcc/rust/typecheck/rust-hir-type-check-expr.cc b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
index 8911a1d99f7..7ea1bd900ba 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-expr.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
@@ -1492,8 +1492,10 @@ TypeCheckExpr::visit (HIR::ClosureExpr &expr)
 		 expr.get_locus ());
 
   // generate the closure type
+  NodeId closure_node_id = expr.get_mappings ().get_nodeid ();
+  const std::set<NodeId> &captures = resolver->get_captures (closure_node_id);
   infered = new TyTy::ClosureType (ref, id, ident, closure_args, result_type,
-				   subst_refs);
+				   subst_refs, captures);
 
   // FIXME
   // all closures automatically inherit the appropriate fn trait. Lets just
diff --git a/gcc/rust/typecheck/rust-tyty.cc b/gcc/rust/typecheck/rust-tyty.cc
index e56bdd17b87..86f40af0fbe 100644
--- a/gcc/rust/typecheck/rust-tyty.cc
+++ b/gcc/rust/typecheck/rust-tyty.cc
@@ -1675,8 +1675,7 @@ std::string
 ClosureType::as_string () const
 {
   std::string params_buf = parameters->as_string ();
-  return "|" + params_buf + "| {" + result_type.get_tyty ()->as_string ()
-	 + "} {" + raw_bounds_as_string () + "}";
+  return "|" + params_buf + "| {" + result_type.get_tyty ()->as_string () + "}";
 }
 
 BaseType *
@@ -1714,7 +1713,7 @@ ClosureType::clone () const
 {
   return new ClosureType (get_ref (), get_ty_ref (), ident, id,
 			  (TyTy::TupleType *) parameters->clone (), result_type,
-			  clone_substs (), get_combined_refs (),
+			  clone_substs (), captures, get_combined_refs (),
 			  specified_bounds);
 }
 
diff --git a/gcc/rust/typecheck/rust-tyty.h b/gcc/rust/typecheck/rust-tyty.h
index 9a9f0aa915e..8b39e5138fb 100644
--- a/gcc/rust/typecheck/rust-tyty.h
+++ b/gcc/rust/typecheck/rust-tyty.h
@@ -1628,13 +1628,15 @@ public:
   ClosureType (HirId ref, DefId id, RustIdent ident,
 	       TyTy::TupleType *parameters, TyVar result_type,
 	       std::vector<SubstitutionParamMapping> subst_refs,
+	       std::set<NodeId> captures,
 	       std::set<HirId> refs = std::set<HirId> (),
 	       std::vector<TypeBoundPredicate> specified_bounds
 	       = std::vector<TypeBoundPredicate> ())
     : BaseType (ref, ref, TypeKind::CLOSURE, ident, refs),
       SubstitutionRef (std::move (subst_refs),
 		       SubstitutionArgumentMappings::error ()),
-      parameters (parameters), result_type (std::move (result_type)), id (id)
+      parameters (parameters), result_type (std::move (result_type)), id (id),
+      captures (captures)
   {
     LocalDefId local_def_id = id.localDefId;
     rust_assert (local_def_id != UNKNOWN_LOCAL_DEFID);
@@ -1644,13 +1646,15 @@ public:
   ClosureType (HirId ref, HirId ty_ref, RustIdent ident, DefId id,
 	       TyTy::TupleType *parameters, TyVar result_type,
 	       std::vector<SubstitutionParamMapping> subst_refs,
+	       std::set<NodeId> captures,
 	       std::set<HirId> refs = std::set<HirId> (),
 	       std::vector<TypeBoundPredicate> specified_bounds
 	       = std::vector<TypeBoundPredicate> ())
     : BaseType (ref, ty_ref, TypeKind::CLOSURE, ident, refs),
       SubstitutionRef (std::move (subst_refs),
 		       SubstitutionArgumentMappings::error ()),
-      parameters (parameters), result_type (std::move (result_type)), id (id)
+      parameters (parameters), result_type (std::move (result_type)), id (id),
+      captures (captures)
   {
     LocalDefId local_def_id = id.localDefId;
     rust_assert (local_def_id != UNKNOWN_LOCAL_DEFID);
@@ -1699,10 +1703,13 @@ public:
 
   void setup_fn_once_output () const;
 
+  const std::set<NodeId> &get_captures () const { return captures; }
+
 private:
   TyTy::TupleType *parameters;
   TyVar result_type;
   DefId id;
+  std::set<NodeId> captures;
 };
 
 class ArrayType : public BaseType