+#define CHKF(bad, error_args) if (bad) {             \
+    setError error_args;                             \
+  _setup.stack_index = 0;                            \
+  strcpy(_setup.stack[_setup.stack_index++], name);  \
+  _setup.stack[_setup.stack_index][0] = 0;           \
+  return NCE_VARIABLE;                               \
+  } else
+
+