[json parser] add position to error message.

test/mjsunit/messages.js

Index: test/mjsunit/messages.js
diff --git a/test/mjsunit/messages.js b/test/mjsunit/messages.js
index 8da7e6bd7b950420d214e64b2f880ba9c1080f59..772670a06c3de3eb1e2a496957b53282e9496df1 100644
--- a/test/mjsunit/messages.js
+++ b/test/mjsunit/messages.js
@@ -345,36 +345,35 @@ test(function() {
   eval("/a/x.test(\"a\");");
 }, "Invalid regular expression flags", SyntaxError);
 
-// kMalformedRegExp
-test(function() {
-  /(/.test("a");
-}, "Invalid regular expression: /(/: Unterminated group", SyntaxError);
-
-// kParenthesisInArgString
-test(function() {
-  new Function(")", "");
-}, "Function arg string contains parenthesis", SyntaxError);
-
-// kUnexpectedEOS
+//kJsonParseUnexpectedEOS
 test(function() {
   JSON.parse("{")
-}, "Unexpected end of input", SyntaxError);
+}, "Unexpected end of JSON input", SyntaxError);
 
-// kUnexpectedToken
+// kJsonParseUnexpectedTokenAt
 test(function() {
   JSON.parse("/")
-}, "Unexpected token /", SyntaxError);
+}, "Unexpected token / in JSON at position 0", SyntaxError);
 
-// kUnexpectedTokenNumber
+// kJsonParseUnexpectedTokenNumberAt
 test(function() {
   JSON.parse("{ 1")
-}, "Unexpected number", SyntaxError);
+}, "Unexpected number in JSON at position 2", SyntaxError);
 
-// kUnexpectedTokenString
+// kJsonParseUnexpectedTokenStringAt
 test(function() {
   JSON.parse('"""')
-}, "Unexpected string", SyntaxError);
+}, "Unexpected string in JSON at position 2", SyntaxError);
 
+// kMalformedRegExp
+test(function() {
+  /(/.test("a");
+}, "Invalid regular expression: /(/: Unterminated group", SyntaxError);
+
+// kParenthesisInArgString
+test(function() {
+  new Function(")", "");
+}, "Function arg string contains parenthesis", SyntaxError);
 
 // === ReferenceError ===