Update errors, adding one for "overlapping Elm module names"

hints/6.md

@@ -0,0 +1,18 @@
+# Problem
+
+The application you are using ran into a problem.
+
+If you let their support team know about this error, please give them a link to this web page as well!
+
+
+<br>
+
+## Info for Developers
+
+This page loads multiple Elm scripts. It then puts the publicly exposed modules from each script on the global `Elm` object. The problem is that there is a name clash.
+
+For example, script `a.js` may expose an Elm module named `Main`, and script `b.js` may expose an Elm module named `Main`. Elm cannot know which one to use! So they need to have unique names if you need them to be added to the global `Elm` object.
+
+Maybe a duplicate script is getting loaded accidentally? Anyway, if you reproduce this error in dev mode, it will tell you the module name that is getting added more than once.
+
+Hopefully that helps!

src/Elm/Kernel/Error.js

@@ -40,10 +40,8 @@ function _Error_throw__DEBUG(identifier, fact1, fact2, fact3, fact4)
 			throw new Error('Trying to use `(==)` on functions.\nThere is no way to know if functions are "the same" in the Elm sense.\nRead more about this at http://package.elm-lang.org/packages/elm-lang/core/latest/Basics#== which describes why it is this way and what the better version will look like.');
 
 		case 6:
-			throw new Error('Comparison error: cannot compare tuples with more than 6 elements.');
-
-		case 7:
-			throw new Error('Comparison error: comparison is only defined on ints, floats, times, chars, strings, lists of comparable values, and tuples of comparable values.');
+			var moduleName = fact1;
+			throw new Error('Your page is loading multiple Elm scripts with a module named ' + moduleName + '. Maybe a duplicate script is getting loaded accidentally? If not, rename one of them so I know which is which!');
 
 		case 8:
 			var moduleName = fact1;