Fix edge cases with comments

index.js

@@ -4,6 +4,10 @@
 var found = function (n) {
 	return n !== -1;
 };
+/** @param {number} n */
+var notFoundGoesLast = function (n) {
+	return found(n) ? n : Infinity;
+};
 
 /** @param {unknown} fn */
 module.exports = function isArrowFunction(fn) {
@@ -23,30 +27,31 @@ module.exports = function isArrowFunction(fn) {
 	var paren = fnStr.indexOf('(');
 	var brace = fnStr.indexOf('{');
 	var arrow = fnStr.indexOf('=>');
+	var slash = fnStr.indexOf('/');
 
-	if (classRe.test(fnStr)) {
-		return false;
-	}
-	if (!found(arrow) || !found(firstNonSpace)) {
+	if (!found(firstNonSpace) || !found(arrow) || classRe.test(fnStr)) {
 		return false;
 	}
-	if (!found(brace) || !found(paren)) {
+	if (!found(brace) || !found(paren) || paren === firstNonSpace) {
 		return true;
 	}
 	if (found(quote) && quote === firstNonSpace) {
 		return false;
 	}
-	if (paren === firstNonSpace) {
-		return true;
-	}
-	if (Math.min(arrow, brace, paren) === arrow) {
+
+	var firstPunct = [
+		arrow,
+		brace,
+		paren,
+		slash
+	].map(notFoundGoesLast).sort(function (a, b) {
+		return a - b;
+	})[0];
+
+	if (firstPunct === arrow) {
 		return true;
 	}
 
 	var beforeParams = fnStr.slice(0, paren).replace(stripRe, '');
-	if (beforeParams && beforeParams !== 'async') {
-		return false;
-	}
-
-	return paren < arrow && arrow < brace;
+	return !beforeParams || beforeParams === 'async';
 };

package.json

@@ -11,7 +11,7 @@
 		"test": "npm run tests-only && npm run test:harmony",
 		"posttest": "npx aud --production",
 		"tests-only": "nyc tape test",
-		"test:harmony": "nyc node --es-staging --harmony test",
+		"test:harmony": "nyc node --harmony test",
 		"lint": "eslint ."
 	},
 	"repository": {

test/index.js

@@ -349,5 +349,15 @@ test('corner cases', function (t) {
 		'() => {}'() {}
 	})['() => {}']));
 
+	t.ok(isArrowFunction(/* function */x => { }));
+	t.ok(isArrowFunction(x/* function */ => { }));
+	t.ok(isArrowFunction(/* function */() => { }));
+	t.ok(isArrowFunction(()/* function */ => { }));
+	t.ok(isArrowFunction((/* function */) => {}));
+
+	t.notOk(isArrowFunction(function/* => */() { }));
+	t.notOk(isArrowFunction(function name/* => */() { }));
+	t.notOk(isArrowFunction(function/* => */name() { }));
+
 	t.end();
 });