diff --git a/example/readerreplxx/readerreplxx.cpp b/example/readerreplxx/readerreplxx.cpp
index 5d74dc06..341893cf 100644
--- a/example/readerreplxx/readerreplxx.cpp
+++ b/example/readerreplxx/readerreplxx.cpp
@@ -110,6 +110,8 @@ namespace {
 
             pps.prettyn(expr_pr);
 
+            p_reader->reset_result();
+
             *p_input = remaining;
 
             return true;
diff --git a/include/xo/reader2/SchematikaReader.hpp b/include/xo/reader2/SchematikaReader.hpp
index 540c19bc..fd26a4ec 100644
--- a/include/xo/reader2/SchematikaReader.hpp
+++ b/include/xo/reader2/SchematikaReader.hpp
@@ -56,6 +56,9 @@ namespace xo {
             /** consume input @p input_cstr **/
             const ReaderResult & read_expr(span_type input_span, bool eof);
 
+            /** reset @ref result_ to nominal value **/
+            void reset_result();
+
             /** reset to known starting point after encountering an error.
              *  - remainder of stashed current line.
              *    Necesary for well-formatted error reporting.
diff --git a/src/reader2/DExprSeqState.cpp b/src/reader2/DExprSeqState.cpp
index c6e53ba2..1d7aea93 100644
--- a/src/reader2/DExprSeqState.cpp
+++ b/src/reader2/DExprSeqState.cpp
@@ -11,6 +11,8 @@
 #include <xo/expression2/detail/IExpression_DConstant.hpp>
 #include <xo/object2/DFloat.hpp>
 #include <xo/object2/number/IGCObject_DFloat.hpp>
+#include <xo/object2/DBoolean.hpp>
+#include <xo/object2/boolean/IGCObject_DBoolean.hpp>
 #include <xo/gc/GCObject.hpp>
 
 namespace xo {
@@ -221,6 +223,26 @@ namespace xo {
         DExprSeqState::on_bool_token(const Token & tk,
                                      ParserStateMachine * p_psm)
         {
+            switch (seqtype_) {
+            case exprseqtype::toplevel_interactive:
+                {
+                    auto dvalue = DBoolean::box<AGCObject>(p_psm->expr_alloc(),
+                                                           tk.bool_value());
+                    auto * dconst = DConstant::make(p_psm->expr_alloc(), dvalue);
+                    auto expr = with_facet<AExpression>::mkobj(dconst);
+
+                    DProgressSsm::start(p_psm->parser_alloc(),
+                                        expr,
+                                        p_psm);
+                    return;
+                }
+            case exprseqtype::toplevel_batch:
+                break;
+            case exprseqtype::N:
+                assert(false); // unreachable
+                break;
+            }
+
             p_psm->illegal_input_on_token("DExprSeqState::on_bool_token",
                                           tk,
                                           this->get_expect_str());
diff --git a/src/reader2/SchematikaReader.cpp b/src/reader2/SchematikaReader.cpp
index 8aa85bf8..4dd8600c 100644
--- a/src/reader2/SchematikaReader.cpp
+++ b/src/reader2/SchematikaReader.cpp
@@ -142,6 +142,12 @@ namespace xo {
             return this->result_;
         }
 
+        void
+        SchematikaReader::reset_result()
+        {
+            this->parser_.reset_result();
+        }
+
         void
         SchematikaReader::reset_to_idle_toplevel()
         {