Closes #315

CppCoreGuidelines.md

@@ -680,11 +680,13 @@ You don't need to write error handlers for errors caught at compile time.
     if (bits < 32)
         cerr << "Int too small\n"
 
-This example is easily simplified
+This example fails to achieve what it is trying to achieve (because overflow is undefined) and should be replaced with a simple `static_assert`:
 
     // Int is an alias used for integers
     static_assert(sizeof(Int) >= 4);    // do: compile-time check
 
+Or better still just use the type system and replace `Int` with `int32_t`.
+
 ##### Example
 
     void read(int* p, int n);   // read max n integers into *p