Better error message

sql/item_strfunc.cc

@@ -2166,17 +2166,11 @@ void Item_func_set_collation::fix_length_and_dec()
 					 MY_CS_BINSORT,MYF(0));
   else
     set_collation= get_charset_by_name(colname,MYF(0));
-  
-  if (!set_collation)
-  {
-    my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), str->c_ptr());
-    return;
-  }
-  
-  if (!my_charset_same(args[0]->charset(),set_collation))
+
+  if (!set_collation || !my_charset_same(args[0]->charset(),set_collation))
   {
     my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
-      set_collation->name,args[0]->charset()->csname);
+      colname,args[0]->charset()->csname);
     return;
   }
   set_charset(set_collation, COER_EXPLICIT);

sql/share/charsets/Index.xml

 <?xml version='1.0' encoding="utf-8"?>
 
-<charsets max-id="82">
+<charsets max-id="83">
 
 <description>
 This file lists all of the available character sets.
@@ -377,6 +377,7 @@ To make maintaining easier please:
   <description>UTF-8 Unicode</description>
   <alias>utf-8</alias>
   <collation name="utf8"	id="33"	flag="primary"/>
+  <collation name="utf8_bin"	id="83"	flag="binary"/>
 </charset>
 
 <charset name="ucs2">