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-rw-r--r--third_party/nix/default.nix7
-rw-r--r--third_party/nix/src/libexpr/CMakeLists.txt2
-rw-r--r--third_party/nix/src/libexpr/attr-set.cc3
-rw-r--r--third_party/nix/src/libexpr/attr-set.hh11
-rw-r--r--third_party/nix/src/libexpr/eval.cc82
-rw-r--r--third_party/nix/src/libexpr/eval.hh25
-rw-r--r--third_party/nix/src/libexpr/get-drvs.hh6
-rw-r--r--third_party/nix/src/libexpr/nixexpr.hh30
-rw-r--r--third_party/nix/src/libexpr/parser.hh3
-rw-r--r--third_party/nix/src/libexpr/parser.y7
-rw-r--r--third_party/nix/src/libexpr/primops.cc12
-rw-r--r--third_party/nix/src/libexpr/value.hh21
-rw-r--r--third_party/nix/src/nix-env/nix-env.cc2
-rw-r--r--third_party/nix/src/nix/repl.cc5
-rw-r--r--third_party/nix/src/tests/attr-set.cc5
15 files changed, 51 insertions, 170 deletions
diff --git a/third_party/nix/default.nix b/third_party/nix/default.nix
index f9ed4749e6..fc3ed792e2 100644
--- a/third_party/nix/default.nix
+++ b/third_party/nix/default.nix
@@ -12,12 +12,6 @@ let
     customMemoryManagement = false;
   };
 
- # TODO(tazjin): this is copied from the original derivation, but what
- # is it for?
-  largeBoehm = pkgs.boehmgc.override {
-    enableLargeConfig = true;
-  };
-
   src = ./.;
 
   # Proto generation in CMake is theoretically possible, but that is
@@ -84,7 +78,6 @@ in lib.fix (self: pkgs.llvmPackages.libcxxStdenv.mkDerivation {
 
   propagatedBuildInputs = with pkgs; [
     boost
-    largeBoehm
   ];
 
   configurePhase = ''
diff --git a/third_party/nix/src/libexpr/CMakeLists.txt b/third_party/nix/src/libexpr/CMakeLists.txt
index 6b62b44f71..7a6b01a9d4 100644
--- a/third_party/nix/src/libexpr/CMakeLists.txt
+++ b/third_party/nix/src/libexpr/CMakeLists.txt
@@ -75,8 +75,6 @@ target_link_libraries(nixexpr
   absl::flat_hash_set
   absl::node_hash_set
   absl::strings
-  gc
-  gccpp
 )
 
 configure_file("nix-expr.pc.in" "${PROJECT_BINARY_DIR}/nix-expr.pc" @ONLY)
diff --git a/third_party/nix/src/libexpr/attr-set.cc b/third_party/nix/src/libexpr/attr-set.cc
index 900ae7a86e..e9e2a2bade 100644
--- a/third_party/nix/src/libexpr/attr-set.cc
+++ b/third_party/nix/src/libexpr/attr-set.cc
@@ -3,7 +3,6 @@
 #include <new>
 
 #include <absl/container/btree_map.h>
-#include <gc/gc_cpp.h>
 #include <glog/logging.h>
 
 #include "libexpr/eval-inline.hh"
@@ -61,7 +60,7 @@ Bindings* Bindings::NewGC(size_t capacity) {
     return &ZERO_BINDINGS;
   }
 
-  return new (GC) Bindings;
+  return new Bindings;
 }
 
 Bindings* Bindings::Merge(const Bindings& lhs, const Bindings& rhs) {
diff --git a/third_party/nix/src/libexpr/attr-set.hh b/third_party/nix/src/libexpr/attr-set.hh
index a9db0db856..6397008517 100644
--- a/third_party/nix/src/libexpr/attr-set.hh
+++ b/third_party/nix/src/libexpr/attr-set.hh
@@ -2,7 +2,6 @@
 #pragma once
 
 #include <absl/container/btree_map.h>
-#include <gc/gc_allocator.h>
 
 #include "libexpr/nixexpr.hh"
 #include "libexpr/symbol-table.hh"
@@ -14,7 +13,7 @@ class EvalState;
 struct Value;
 
 /* Map one attribute name to its value. */
-struct Attr : public gc {
+struct Attr {
   Symbol name;
   Value* value;  // TODO(tazjin): Who owns this?
   Pos* pos;      // TODO(tazjin): Who owns this?
@@ -22,13 +21,9 @@ struct Attr : public gc {
       : name(name), value(value), pos(pos){};
 };
 
-// Convenience alias for the backing map, with the garbage-collecting
-// allocator explicitly specified.
-using AttributeMap =
-    absl::btree_map<Symbol, Attr, std::less<Symbol>,
-                    traceable_allocator<std::pair<const Symbol, Attr>>>;
+using AttributeMap = absl::btree_map<Symbol, Attr>;
 
-class Bindings : public gc {
+class Bindings {
  public:
   typedef AttributeMap::iterator iterator;
 
diff --git a/third_party/nix/src/libexpr/eval.cc b/third_party/nix/src/libexpr/eval.cc
index 4b848d054c..4ae3661b0b 100644
--- a/third_party/nix/src/libexpr/eval.cc
+++ b/third_party/nix/src/libexpr/eval.cc
@@ -11,13 +11,9 @@
 #include <optional>
 #include <variant>
 
-#define GC_INCLUDE_NEW
-
 #include <absl/base/call_once.h>
 #include <absl/container/flat_hash_set.h>
 #include <absl/strings/match.h>
-#include <gc/gc.h>
-#include <gc/gc_cpp.h>
 #include <glog/logging.h>
 #include <sys/resource.h>
 #include <sys/time.h>
@@ -38,52 +34,7 @@
 namespace nix {
 namespace {
 
-// Called when the Boehm GC runs out of memory.
-static void* BoehmOomHandler(size_t requested) {
-  /* Convert this to a proper C++ exception. */
-  LOG(FATAL) << "Garbage collector ran out of memory; requested " << requested
-             << " bytes";
-  throw std::bad_alloc();
-}
-
-void ConfigureBoehmGc() {
-  /* Don't look for interior pointers. This reduces the odds of
-     misdetection a bit. */
-  GC_set_all_interior_pointers(0);
-
-  /* We don't have any roots in data segments, so don't scan from
-     there. */
-  GC_set_no_dls(1);
-
-  GC_INIT();
-
-  GC_set_oom_fn(BoehmOomHandler);
-
-  /* Set the initial heap size to something fairly big (25% of
-     physical RAM, up to a maximum of 384 MiB) so that in most cases
-     we don't need to garbage collect at all.  (Collection has a
-     fairly significant overhead.)  The heap size can be overridden
-     through libgc's GC_INITIAL_HEAP_SIZE environment variable.  We
-     should probably also provide a nix.conf setting for this.  Note
-     that GC_expand_hp() causes a lot of virtual, but not physical
-     (resident) memory to be allocated.  This might be a problem on
-     systems that don't overcommit. */
-  if (getenv("GC_INITIAL_HEAP_SIZE") == nullptr) {
-    size_t size = 32 * 1024 * 1024;
-#if HAVE_SYSCONF && defined(_SC_PAGESIZE) && defined(_SC_PHYS_PAGES)
-    size_t maxSize = 384 * 1024 * 1024;
-    long pageSize = sysconf(_SC_PAGESIZE);
-    long pages = sysconf(_SC_PHYS_PAGES);
-    if (pageSize != -1) {
-      size = (pageSize * pages) / 4;
-    }  // 25% of RAM
-    if (size > maxSize) {
-      size = maxSize;
-    }
-#endif
-    DLOG(INFO) << "setting initial heap size to " << size << " bytes";
-    GC_expand_hp(size);
-  }
+void ConfigureGc() { /* This function intentionally left blank. */
 }
 
 }  // namespace
@@ -92,13 +43,13 @@ namespace expr {
 
 absl::once_flag gc_flag;
 
-void InitGC() { absl::call_once(gc_flag, &ConfigureBoehmGc); }
+void InitGC() { absl::call_once(gc_flag, &ConfigureGc); }
 
 }  // namespace expr
 
 static char* dupString(const char* s) {
   char* t;
-  t = GC_STRDUP(s);
+  t = strdup(s);
   if (t == nullptr) {
     throw std::bad_alloc();
   }
@@ -106,7 +57,7 @@ static char* dupString(const char* s) {
 }
 
 std::shared_ptr<Value*> allocRootValue(Value* v) {
-  return std::allocate_shared<Value*>(traceable_allocator<Value*>(), v);
+  return std::make_shared<Value*>(v);
 }
 
 static void printValue(std::ostream& str, std::set<const Value*>& active,
@@ -489,7 +440,7 @@ Value* EvalState::addPrimOp(const std::string& name, size_t arity,
   Symbol sym = symbols.Create(name2);
   // Even though PrimOp doesn't need tracing, it needs to be collected.
   v->type = tPrimOp;
-  v->primOp = new (GC) PrimOp(primOp, arity, sym);
+  v->primOp = new PrimOp(primOp, arity, sym);
   staticBaseEnv.vars[symbols.Create(name)] = baseEnvDispl;
   baseEnv.values[baseEnvDispl++] = v;
   baseEnv.values[0]->attrs->push_back(Attr(sym, v));
@@ -631,7 +582,7 @@ inline Value* EvalState::lookupVar(Env* env, const ExprVar& var, bool noEval) {
 
 Value* EvalState::allocValue() {
   nrValues++;
-  return new (GC) Value;
+  return new Value;
 }
 
 Env& EvalState::allocEnv(size_t size) {
@@ -655,7 +606,7 @@ void EvalState::mkList(Value& v, NixList* list) {
 }
 
 void EvalState::mkList(Value& v, size_t size) {
-  EvalState::mkList(v, new (GC) NixList(size));
+  EvalState::mkList(v, new NixList(size));
 }
 
 unsigned long nrThunks = 0;
@@ -1262,7 +1213,7 @@ void ExprOpConcatLists::eval(EvalState& state, Env& env, Value& v) {
 void EvalState::concatLists(Value& v, const NixList& lists, const Pos& pos) {
   nrListConcats++;
 
-  auto outlist = new (GC) NixList();
+  auto outlist = new NixList();
 
   for (Value* list : lists) {
     forceList(*list, pos);
@@ -1344,10 +1295,7 @@ void ExprPos::eval(EvalState& state, Env& env, Value& v) {
 }
 
 template <typename T>
-using traceable_flat_hash_set =
-    absl::flat_hash_set<T, absl::container_internal::hash_default_hash<T>,
-                        absl::container_internal::hash_default_eq<T>,
-                        traceable_allocator<T>>;
+using traceable_flat_hash_set = absl::flat_hash_set<T>;
 
 void EvalState::forceValueDeep(Value& v) {
   traceable_flat_hash_set<const Value*> seen;
@@ -1713,11 +1661,6 @@ void EvalState::printStats() {
   uint64_t bAttrsets =
       nrAttrsets * sizeof(Bindings) + nrAttrsInAttrsets * sizeof(Attr);
 
-#if HAVE_BOEHMGC
-  GC_word heapSize;
-  GC_word totalBytes;
-  GC_get_heap_usage_safe(&heapSize, nullptr, nullptr, nullptr, &totalBytes);
-#endif
   if (showStats) {
     auto outPath = getEnv("NIX_SHOW_STATS_PATH", "-");
     std::fstream fs;
@@ -1768,13 +1711,6 @@ void EvalState::printStats() {
     topObj.attr("nrLookups", nrLookups);
     topObj.attr("nrPrimOpCalls", nrPrimOpCalls);
     topObj.attr("nrFunctionCalls", nrFunctionCalls);
-#if HAVE_BOEHMGC
-    {
-      auto gc = topObj.object("gc");
-      gc.attr("heapSize", heapSize);
-      gc.attr("totalBytes", totalBytes);
-    }
-#endif
 
     if (countCalls) {
       {
diff --git a/third_party/nix/src/libexpr/eval.hh b/third_party/nix/src/libexpr/eval.hh
index d2ff99c9fc..f3e38cfb3c 100644
--- a/third_party/nix/src/libexpr/eval.hh
+++ b/third_party/nix/src/libexpr/eval.hh
@@ -5,9 +5,6 @@
 #include <unordered_map>
 #include <vector>
 
-#include <gc/gc_allocator.h>
-#include <gc/gc_cpp.h>
-
 #include "libexpr/attr-set.hh"
 #include "libexpr/nixexpr.hh"
 #include "libexpr/symbol-table.hh"
@@ -39,16 +36,14 @@ struct PrimOp {
       : fun(fun), arity(arity), name(name) {}
 };
 
-struct Env : public gc {
-  Env(unsigned short size) : size(size) {
-    values = std::vector<Value*, traceable_allocator<Value*>>(size);
-  }
+struct Env {
+  Env(unsigned short size) : size(size) { values = std::vector<Value*>(size); }
 
   Env* up;
   unsigned short size;           // used by ‘valueSize’
   unsigned short prevWith : 14;  // nr of levels up to next `with' environment
   enum { Plain = 0, HasWithExpr, HasWithAttrs } type : 2;
-  std::vector<Value*, traceable_allocator<Value*>> values;
+  std::vector<Value*> values;
   Expr* withAttrsExpr = nullptr;
 };
 
@@ -63,14 +58,12 @@ typedef std::map<Path, Path> SrcToStore;
 
 std::ostream& operator<<(std::ostream& str, const Value& v);
 
-typedef std::pair<std::string, std::string> SearchPathElem;
-typedef std::list<SearchPathElem> SearchPath;
+using SearchPathElem = std::pair<std::string, std::string>;
+using SearchPath = std::list<SearchPathElem>;
 
-typedef std::map<Path, Expr*, std::less<Path>,
-                 traceable_allocator<std::pair<const Path, Expr*>>>
-    FileParseCache;
+using FileParseCache = std::map<Path, Expr*>;
 
-class EvalState : public gc {
+class EvalState {
  public:
   SymbolTable symbols;
 
@@ -100,9 +93,7 @@ class EvalState : public gc {
   FileParseCache fileParseCache;
 
   /* A cache from path names to values. */
-  typedef std::map<Path, Value, std::less<Path>,
-                   traceable_allocator<std::pair<const Path, Value>>>
-      FileEvalCache;
+  using FileEvalCache = std::map<Path, Value>;
   FileEvalCache fileEvalCache;
 
   SearchPath searchPath;
diff --git a/third_party/nix/src/libexpr/get-drvs.hh b/third_party/nix/src/libexpr/get-drvs.hh
index 30645123ea..608713ed1b 100644
--- a/third_party/nix/src/libexpr/get-drvs.hh
+++ b/third_party/nix/src/libexpr/get-drvs.hh
@@ -7,7 +7,7 @@
 
 namespace nix {
 
-struct DrvInfo : public gc {
+struct DrvInfo {
  public:
   typedef std::map<std::string, Path> Outputs;
 
@@ -67,11 +67,7 @@ struct DrvInfo : public gc {
   bool hasFailed() { return failed; };
 };
 
-#if HAVE_BOEHMGC
-typedef std::list<DrvInfo, traceable_allocator<DrvInfo> > DrvInfos;
-#else
 typedef std::list<DrvInfo> DrvInfos;
-#endif
 
 /* If value `v' denotes a derivation, return a DrvInfo object
    describing it. Otherwise return nothing. */
diff --git a/third_party/nix/src/libexpr/nixexpr.hh b/third_party/nix/src/libexpr/nixexpr.hh
index 6edfb2a187..22b5f871f0 100644
--- a/third_party/nix/src/libexpr/nixexpr.hh
+++ b/third_party/nix/src/libexpr/nixexpr.hh
@@ -73,19 +73,16 @@ struct StaticEnv;
 
 /* An attribute path is a sequence of attribute names. */
 using AttrName = std::variant<Symbol, Expr*>;
+using AttrPath = std::vector<AttrName>;
+using AttrNameVector = std::vector<AttrName>;
 
-typedef std::vector<AttrName, traceable_allocator<AttrName>> AttrPath;
-
-using AttrNameVector =
-    std::vector<nix::AttrName, traceable_allocator<nix::AttrName>>;
-
-using VectorExprs = std::vector<nix::Expr*, traceable_allocator<nix::Expr*>>;
+using VectorExprs = std::vector<nix::Expr*>;
 
 std::string showAttrPath(const AttrPath& attrPath);
 
 /* Abstract syntax of Nix expressions. */
 
-struct Expr : public gc {
+struct Expr {
   virtual ~Expr(){};
   virtual void show(std::ostream& str) const;
   virtual void bindVars(const StaticEnv& env);
@@ -191,7 +188,7 @@ struct ExprOpHasAttr : Expr {
 struct ExprAttrs : Expr {
   bool recursive;
 
-  struct AttrDef : public gc {
+  struct AttrDef {
     bool inherited;
     Expr* e;
     Pos pos;
@@ -201,22 +198,17 @@ struct ExprAttrs : Expr {
     AttrDef(){};
   };
 
-  typedef absl::flat_hash_map<
-      Symbol, AttrDef, absl::container_internal::hash_default_hash<Symbol>,
-      absl::container_internal::hash_default_eq<Symbol>,
-      traceable_allocator<std::pair<const Symbol, AttrDef>>>
-      AttrDefs;
+  using AttrDefs = absl::flat_hash_map<Symbol, AttrDef>;
   AttrDefs attrs;
 
-  struct DynamicAttrDef : public gc {
+  struct DynamicAttrDef {
     Expr *nameExpr, *valueExpr;
     Pos pos;
     DynamicAttrDef(Expr* nameExpr, Expr* valueExpr, const Pos& pos)
         : nameExpr(nameExpr), valueExpr(valueExpr), pos(pos){};
   };
 
-  typedef std::vector<DynamicAttrDef, traceable_allocator<DynamicAttrDef>>
-      DynamicAttrDefs;
+  using DynamicAttrDefs = std::vector<DynamicAttrDef>;
   DynamicAttrDefs dynamicAttrs;
 
   ExprAttrs() : recursive(false){};
@@ -229,15 +221,15 @@ struct ExprList : Expr {
   COMMON_METHODS
 };
 
-struct Formal : public gc {
+struct Formal {
   Symbol name;
   Expr* def;  // def = default, not definition
   Formal(const Symbol& name, Expr* def) : name(name), def(def){};
 };
 
 // Describes structured function arguments (e.g. `{ a }: ...`)
-struct Formals : public gc {
-  typedef std::list<Formal, traceable_allocator<Formal>> Formals_;
+struct Formals {
+  using Formals_ = std::list<Formal>;
   Formals_ formals;
   std::set<Symbol> argNames;  // used during parsing
   bool ellipsis;
diff --git a/third_party/nix/src/libexpr/parser.hh b/third_party/nix/src/libexpr/parser.hh
index ca7a88b3b9..a79e2cad28 100644
--- a/third_party/nix/src/libexpr/parser.hh
+++ b/third_party/nix/src/libexpr/parser.hh
@@ -5,7 +5,6 @@
 #include <optional>
 #include <variant>
 
-#include <gc/gc.h>
 #include <glog/logging.h>
 
 #include "libexpr/eval.hh"
@@ -20,7 +19,7 @@
 
 namespace nix {
 
-struct ParseData : public gc {
+struct ParseData {
   EvalState& state;
   SymbolTable& symbols;
   Expr* result;
diff --git a/third_party/nix/src/libexpr/parser.y b/third_party/nix/src/libexpr/parser.y
index b47d96b1e1..ba6490e60a 100644
--- a/third_party/nix/src/libexpr/parser.y
+++ b/third_party/nix/src/libexpr/parser.y
@@ -15,12 +15,7 @@
 #define YY_NO_INPUT 1 // disable unused yyinput features
 #include "libexpr/parser.hh"
 
-// Allow GC tracing of YY-allocated structures
-#define YYMALLOC GC_MALLOC_UNCOLLECTABLE
-#define YYFREE GC_FREE
-#define YYREALLOC GC_REALLOC
-
-struct YYSTYPE : public gc {
+struct YYSTYPE {
   union {
     nix::Expr * e;
     nix::ExprList * list;
diff --git a/third_party/nix/src/libexpr/primops.cc b/third_party/nix/src/libexpr/primops.cc
index 0008b7b180..54dc315fb9 100644
--- a/third_party/nix/src/libexpr/primops.cc
+++ b/third_party/nix/src/libexpr/primops.cc
@@ -290,11 +290,7 @@ struct CompareValues {
   }
 };
 
-#if HAVE_BOEHMGC
-typedef std::list<Value*, gc_allocator<Value*>> ValueList;
-#else
 typedef std::list<Value*> ValueList;
-#endif
 
 static void prim_genericClosure(EvalState& state, const Pos& pos, Value** args,
                                 Value& v) {
@@ -1603,7 +1599,7 @@ static void prim_sort(EvalState& state, const Pos& pos, Value** args,
   state.forceList(*args[1], pos);
 
   // Copy of the input list which can be sorted in place.
-  auto outlist = new (GC) NixList(*args[1]->list);
+  auto outlist = new NixList(*args[1]->list);
 
   std::for_each(outlist->begin(), outlist->end(),
                 [&](Value* val) { state.forceValue(*val); });
@@ -1633,8 +1629,8 @@ static void prim_partition(EvalState& state, const Pos& pos, Value** args,
   state.forceFunction(*args[0], pos);
   state.forceList(*args[1], pos);
 
-  NixList* right = new (GC) NixList();
-  NixList* wrong = new (GC) NixList();
+  NixList* right = new NixList();
+  NixList* wrong = new NixList();
 
   for (Value* elem : *args[1]->list) {
     state.forceValue(*elem, pos);
@@ -1664,7 +1660,7 @@ static void prim_concatMap(EvalState& state, const Pos& pos, Value** args,
   state.forceFunction(*args[0], pos);
   state.forceList(*args[1], pos);
 
-  NixList* outlist = new (GC) NixList;
+  NixList* outlist = new NixList;
 
   for (Value* elem : *args[1]->list) {
     auto out = state.allocValue();
diff --git a/third_party/nix/src/libexpr/value.hh b/third_party/nix/src/libexpr/value.hh
index df6563cf1c..6bb694d183 100644
--- a/third_party/nix/src/libexpr/value.hh
+++ b/third_party/nix/src/libexpr/value.hh
@@ -3,9 +3,6 @@
 #include <tuple>
 #include <vector>
 
-#include <gc/gc_allocator.h>
-#include <gc/gc_cpp.h>
-
 #include "libexpr/symbol-table.hh"
 #include "libutil/types.hh"
 
@@ -66,32 +63,32 @@ struct Value;
    the inputSrcs of the derivations.
 
    For canonicity, the store paths should be in sorted order. */
-struct NixString : public gc {
+struct NixString {
   const char* s;
   const char** context;  // must be in sorted order
 };
 
-struct NixThunk : public gc {
+struct NixThunk {
   Env* env;
   Expr* expr;
 };
 
-struct NixApp : public gc {
+struct NixApp {
   Value *left, *right;
 };
 
-struct NixLambda : public gc {
+struct NixLambda {
   Env* env;
   ExprLambda* fun;
 };
 
-struct NixPrimOpApp : public gc {
+struct NixPrimOpApp {
   Value *left, *right;
 };
 
-using NixList = std::vector<Value*, traceable_allocator<Value*>>;
+using NixList = std::vector<Value*>;
 
-struct Value : public gc {
+struct Value {
   ValueType type;
   union {  // TODO(tazjin): std::variant
     NixInt integer;
@@ -177,9 +174,7 @@ void mkPath(Value& v, const char* s);
    not included. */
 size_t valueSize(const Value& v);
 
-typedef std::map<Symbol, Value*, std::less<Symbol>,
-                 traceable_allocator<std::pair<const Symbol, Value*>>>
-    ValueMap;
+using ValueMap = std::map<Symbol, Value*>;
 
 std::shared_ptr<Value*> allocRootValue(Value* v);
 
diff --git a/third_party/nix/src/nix-env/nix-env.cc b/third_party/nix/src/nix-env/nix-env.cc
index 81eab2dedb..a0fad3f3d1 100644
--- a/third_party/nix/src/nix-env/nix-env.cc
+++ b/third_party/nix/src/nix-env/nix-env.cc
@@ -48,7 +48,7 @@ struct InstallSourceInfo {
   Bindings* autoArgs;
 };
 
-struct Globals : public gc {
+struct Globals {
   InstallSourceInfo instSource;
   Path profile;
   std::shared_ptr<EvalState> state;
diff --git a/third_party/nix/src/nix/repl.cc b/third_party/nix/src/nix/repl.cc
index 281b3c1e45..85750b08ce 100644
--- a/third_party/nix/src/nix/repl.cc
+++ b/third_party/nix/src/nix/repl.cc
@@ -22,9 +22,6 @@
 #include "libutil/finally.hh"
 #include "nix/command.hh"
 
-#define GC_INCLUDE_NEW
-#include <gc/gc_cpp.h>
-
 namespace nix {
 
 #define ESC_RED "\033[31m"
@@ -35,7 +32,7 @@ namespace nix {
 #define ESC_CYA "\033[36m"
 #define ESC_END "\033[0m"
 
-struct NixRepl : gc {
+struct NixRepl {
   std::string curDir;
   EvalState state;
   Bindings* autoArgs;
diff --git a/third_party/nix/src/tests/attr-set.cc b/third_party/nix/src/tests/attr-set.cc
index 17234f6b31..d52956f6ac 100644
--- a/third_party/nix/src/tests/attr-set.cc
+++ b/third_party/nix/src/tests/attr-set.cc
@@ -7,7 +7,6 @@
 
 #include <absl/container/btree_map.h>
 #include <bits/stdint-intn.h>
-#include <gc/gc_cpp.h>
 #include <gtest/gtest.h>
 #include <rapidcheck.h>
 #include <rapidcheck/Assertions.h>
@@ -55,7 +54,7 @@ struct Arbitrary<Value*> {
   static Gen<nix::Value*> arbitrary() {
     return gen::apply(
         [](nix::ValueType typ, int i) {
-          auto ret = new (GC) Value();
+          auto ret = new Value();
           ret->type = typ;
           ret->integer = i;
           return ret;
@@ -78,7 +77,7 @@ struct Arbitrary<nix::Pos*> {
   static Gen<nix::Pos*> arbitrary() {
     return gen::apply(
         [](unsigned int line, unsigned int column) {
-          return new (GC) Pos({}, line, column);
+          return new Pos({}, line, column);
         },
         gen::arbitrary<unsigned int>(), gen::arbitrary<unsigned int>());
   }
generated by cgit-pink 1.4.1 (git 2.44.0) at 2024-06-01T02·41+0000