Excercised invalid unicode characters in json literal

Author: springcomp

tests/literal.json

@@ -78,10 +78,6 @@
                 "expression": "`9`",
                 "result": 9
             },
-            {
-              "expression": "`42 `",
-              "result": 42
-            },
             {
                 "comment": "Escaping a backtick in quotes",
                 "expression": "`\"foo\\`bar\"`",
@@ -136,6 +132,41 @@
           "comment": "Literal on RHS of subexpr not allowed",
           "expression": "foo.`\"bar\"`",
           "error": "syntax"
+        },
+        {
+          "comment": "Literal with all valid leading and trailing JSON whitespace",
+          "expression": "` \t\n\r{\"foo\": true} \t\n\r`",
+          "result": {"foo": true}
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+000C FORM FEED",
+          "expression": "`0\f`",
+          "error": "syntax"
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+0085 NEXT LINE",
+          "expression": "`0\u0085`",
+          "error": "syntax"
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+00A0 NO-BREAK SPACE",
+          "expression": "`0\u00A0`",
+          "error": "syntax"
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+1680 OGHAM SPACE MARK",
+          "expression": "`0\u1680`",
+          "error": "syntax"
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+2028 LINE SEPARATOR",
+          "expression": "`0\u2028`",
+          "error": "syntax"
+        },
+        {
+          "comment": "Literal with non-JSON whitespace U+3000 IDEOGRAPHIC SPACE",
+          "expression": "`0\u3000`",
+          "error": "syntax"
         }
       ]
     },