C++ Mathematical Expression Library (ExprTk)  http://www.partow.net/programming/exprtk/index.html

exprtk.hpp

diff --git a/exprtk.hpp b/exprtk.hpp
index 20a514c..bba9184 100644
--- a/exprtk.hpp
+++ b/exprtk.hpp
@@ -19385,6 +19385,8 @@
                   return error_node();
                else if (!token_is(token_t::e_eof))
                {
+                  free_node(node_allocator_,default_statement);
+
                   set_error(
                      make_error(parser_error::e_syntax,
                                 current_token(),

exprtk_test.cpp

diff --git a/exprtk_test.cpp b/exprtk_test.cpp
index 2cfeda8..c3c819b 100644
--- a/exprtk_test.cpp
+++ b/exprtk_test.cpp
@@ -5903,7 +5903,7 @@
                   T(2122700580)
                 };
 
-      bool failure = true;
+      bool failure = false;
 
       for (std::size_t i = 0; i < expr_str_list_size; ++i)
       {
@@ -5934,7 +5934,7 @@
          }
       }
 
-      if (!failure)
+      if (failure)
          return false;
    }