diff --git a/include/boost/regex/config.hpp b/include/boost/regex/config.hpp
index 0ab0aa39..4edac5b8 100644
--- a/include/boost/regex/config.hpp
+++ b/include/boost/regex/config.hpp
@@ -576,6 +576,21 @@ BOOST_REGEX_DECL void BOOST_REGEX_CALL put_mem_block(void*);
  *  Diagnostics:
  *
  ****************************************************************************/
+ 
+//
+// this is a deliberate error, will be removed once it's diagnostics have been checked:
+//
+#if defined(BOOST_INTEL)
+#if BOOST_REGEX_DECL +0
+#error "Oops1"
+#endif
+#if BOOST_REGEX_CALL +0
+#error "Oops2"
+#endif
+#if BOOST_REGEX_CCALL +0
+#error "Oops3"
+#endif
+#endif
 
 #if defined(BOOST_REGEX_DIAG)
 #  pragma message ("BOOST_REGEX_DECL set as: " BOOST_STRINGIZE(BOOST_REGEX_DECL))
@@ -607,3 +622,4 @@ BOOST_REGEX_DECL void BOOST_REGEX_CALL put_mem_block(void*);
 
 #endif
 
+