diff --git a/src/reader2/DApplySsm.cpp b/src/reader2/DApplySsm.cpp
index ee043ddd..0a616e9a 100644
--- a/src/reader2/DApplySsm.cpp
+++ b/src/reader2/DApplySsm.cpp
@@ -233,7 +233,6 @@ namespace xo {
                 assert(expr_gco);
 
                 obj<AAllocator,DArena> mm(&(p_psm->parser_alloc()));
-                //auto gc = obj<AAllocator>(mm).try_to_facet<ACollector>();
 
                 if (args_expr_v_->size() == args_expr_v_->capacity()) {
                     // need to expand .args_expr_v_ capacity.
diff --git a/src/reader2/DExpectFormalArglistSsm.cpp b/src/reader2/DExpectFormalArglistSsm.cpp
index 3d86158c..7036ffb5 100644
--- a/src/reader2/DExpectFormalArglistSsm.cpp
+++ b/src/reader2/DExpectFormalArglistSsm.cpp
@@ -201,8 +201,6 @@ namespace xo {
                 obj<AAllocator,DArena> mm(&parser_alloc);
                 DArray * argl_2x = DArray::_empty(mm, 2 * argl_->capacity());
 
-                //auto gc = obj<AAllocator>(mm).try_to_facet<ACollector>();
-
                 for (DArray::size_type i = 0, n = argl_->size(); i < n; ++i) {
                     // TODO: prefer non-bounds-checked access here
                     argl_2x->push_back(mm, argl_->at(i));
@@ -212,8 +210,6 @@ namespace xo {
                 this->argl_ = argl_2x;
             }
 
-            //auto gc = expr_alloc.try_to_facet<ACollector>();
-
             this->argl_->push_back(expr_alloc, var_o);
         }
 
diff --git a/src/reader2/DExpectQArraySsm.cpp b/src/reader2/DExpectQArraySsm.cpp
index eda20eb2..b06920c4 100644
--- a/src/reader2/DExpectQArraySsm.cpp
+++ b/src/reader2/DExpectQArraySsm.cpp
@@ -178,8 +178,6 @@ namespace xo {
         DExpectQArraySsm::on_quoted_literal(obj<AGCObject> lit,
                                            ParserStateMachine * p_psm)
         {
-            //auto gc = p_psm->expr_alloc().try_to_facet<ACollector>();
-
             if(state_.code() == QArrayXst::code::qarray_1a) {
                 // append lit at the end of array_
                 {
diff --git a/src/reader2/DGlobalEnv.cpp b/src/reader2/DGlobalEnv.cpp
index c1caf833..0343d2c2 100644
--- a/src/reader2/DGlobalEnv.cpp
+++ b/src/reader2/DGlobalEnv.cpp
@@ -85,8 +85,6 @@ namespace xo {
                 values_->resize(ix.j_slot() + 1);
             }
 
-            //auto gc = mm.try_to_facet<ACollector>();
-
             values_->assign_at(mm,
                                ix.j_slot(),
                                x);