Add additional tests from go-fuzz

Author: jamesls

tests/syntax.json

@@ -84,6 +84,10 @@
         "expression": "(",
         "error": "syntax"
       },
+      {
+        "expression": "((&",
+        "error": "syntax"
+      },
       {
         "expression": "a[",
         "error": "syntax"
@@ -95,6 +99,20 @@
       {
         "expression": "a][",
         "error": "syntax"
+      },
+      {
+        "expression": "!",
+        "error": "syntax"
+      }
+    ]
+  },
+  {
+    "comment": "Boolean syntax errors",
+    "given": {"type": "object"},
+    "cases": [
+      {
+        "expression": "![!(!",
+        "error": "syntax"
       }
     ]
   },