And a few more places with bad throws.

core-js/Graphics/Element.js

@@ -481,7 +481,7 @@ Elm.Graphics = function() {
             var case1 = case0[1], case2 = case0[2], case3 = case0[3], case4 = case0[4];
             return Form_84(t_212 + case1)(case2)(case3)(case4)
         }
-        throw"Non-exhaustive pattern match in case";
+        throw new Error("Non-exhaustive pattern match in case");
       }(Form$thetascaleposform_213)
     }
   }
@@ -505,7 +505,7 @@ Elm.Graphics = function() {
               }
               break
           }
-          throw"Non-exhaustive pattern match in case";
+          throw new Error("Non-exhaustive pattern match in case");
         }(Form$thetascaleTuple2$pxpyform_226)
       }
     }

core-js/List.js

@@ -1,7 +1,7 @@
 Elm.List = function() {
 
     var throwError = function(f) {
-	throw "Function '" + f + "' expecting a list!";
+	throw new Error("Function '" + f + "' expecting a list!");
     }
 
     function length(xs) {
@@ -46,19 +46,19 @@ Elm.List = function() {
     var minimum = foldl1(function(x) { return function(y) { return Math.min(x,y) } });
     function head(v) {
 	if (v[0] !== "Cons") {
-	    throw "Error: 'head' only accepts lists of length greater than one.";
+	    throw new Error("Error: 'head' only accepts lists of length greater than one.");
 	}
 	return v[1];
     }
     function tail(v) {
 	if (v[0] !== "Cons") {
-	    throw "Error: 'tail' only accepts lists of length greater than one.";
+	    throw new Error("Error: 'tail' only accepts lists of length greater than one.");
 	}
 	return v[2];
     }
     function last(v) {
 	if (v[0] !== "Cons") {
-	    throw "Error: 'last' only accepts lists of length greater than one.";
+	    throw new Error("Error: 'last' only accepts lists of length greater than one.");
 	}
 	var out = v[1];
 	while (v[0] === "Cons") {
@@ -129,7 +129,7 @@ Elm.List = function() {
     }
     function foldr1(f) {
       return function(xs) {
-	if (xs[0] === "Nil") { throw "'foldr1' requires an non-empty list." }
+	if (xs[0] === "Nil") { throw new Error("'foldr1' requires an non-empty list.") }
 	if (xs[0] !== "Cons") { throwError('foldr1'); }
 	var arr = [];
 	while (xs[0] === "Cons") {
@@ -165,7 +165,7 @@ Elm.List = function() {
     function scanl1(f) {
       return function(xs) {
 	if (xs[0] !== "Cons") {
-	    throw "Error: 'scanl1' requires a list of at least length 1.";
+	    throw new Error("Error: 'scanl1' requires a list of at least length 1.");
 	}
 	return scanl(f)(xs[1])(xs[2]);
       }

core-js/Prelude.js

@@ -37,7 +37,7 @@ Elm.Prelude = function() {
     };
     var uncurry = function(f) { return function(p) {
 	    if (p[0] !== "Tuple2") {
-		throw "Function was uncurry'd but was not given a pair.";
+		throw new Error("Function was uncurry'd but was not given a pair.");
 	    }
 	    return f(p[1])(p[2]); };
     };