Fixed & search after consuming parenthesis

src/Parser.js

@@ -43,8 +43,8 @@ export function parse (value, root, parent, rule, rules, rulesets, pseudo, point
 		switch (previous = character, character = next()) {
 			// (
 			case 40:
-				if (previous != 108 && charat(characters, length - 1) == 58) {
-					if (indexof(characters += replace(delimit(character), '&', '&\f'), '&\f') != -1)
+				if (charat(characters, length - 1) == 58) {
+					if (indexof(characters += replace(delimit(character), '&', '&\f'), '&\f', abs(points[index - 1])) != -1)
 						ampersand = -1
 					break
 				}

src/Utility.js

@@ -55,10 +55,11 @@ export function replace (value, pattern, replacement) {
 /**
  * @param {string} value
  * @param {string} search
+ * @param {number} position
  * @return {number}
  */
-export function indexof (value, search) {
-	return value.indexOf(search)
+export function indexof (value, search, position) {
+	return value.indexOf(search, position)
 }
 
 /**

test/Parser.js

@@ -142,6 +142,21 @@ describe('Parser', () => {
     ).to.equal(`.user [href="https://css-tricks.com?a=1&b=2"]{color:red;}`)
   })
 
+  test('& in first selector within a comma-separated list', () => {
+    expect(
+      stylis(`
+        div {
+          display: flex;
+
+          &.foo,
+          p:not(:last-child) {
+            background: red;
+          }
+        }
+      `)
+    ).to.equal(`.user div{display:flex;}.user div.foo,.user div p:not(:last-child){background:red;}`)
+  });
+
   test('escaped chars in selector identifiers', () => {
     expect(
       stylis(`