Stop ESLint warnings

- about use of eval
- whitespace before comments

.eslintrc.js

@@ -6,6 +6,7 @@ module.exports = {
     "root": true,
     "rules": {
 
+        "no-eval": 0,
         "prefer-rest-params": 0,
 
     },

test/spec/unit/parser.spec.js

@@ -800,13 +800,11 @@ describe( "PEG.js grammar parser", function () {
 
         expect( "start = '\\a'" ).to.parseAs( literalGrammar( "a", false ) );
 
-    // The negative predicate is impossible to test with PEG.js grammar
-    // structure.
-
     } );
 
-    // The EscapeCharacter rule is impossible to test with PEG.js grammar
-    // structure.
+    // The negative predicate is impossible to test with PEG.js grammar structure.
+
+    // The EscapeCharacter rule is impossible to test with PEG.js grammar structure.
 
     // Canonical HexEscapeSequence is "xFF".
     it( "parses HexEscapeSequence", function () {