Add ignore next warning control comment

test/autoprefixer.test.js

@@ -447,6 +447,21 @@ test('uses ignore next control comments', () => {
   check('ignore-next')
 })
 
+test('uses ignore next warning control comments', () => {
+  let input = read('ignore-next-warning')
+  let output = read('ignore-next-warning.out')
+  let result = postcss([prefixer('grid')]).process(input)
+
+  equal(result.css, output)
+  equal(
+    result.warnings().map(i => i.toString()),
+    [
+      'autoprefixer: <css input>:33:3: Gradient has outdated direction ' +
+        'syntax. New syntax is like `to left` instead of `right`.'
+    ]
+  )
+})
+
 test('uses block control comments', () => {
   check('disabled')
 })

test/cases/ignore-next-warning.css

@@ -0,0 +1,34 @@
+.grid {
+  grid-gap: 1px;
+  grid-template-columns: repeat(3, 1fr);
+  grid-template-rows: repeat(3, 1fr);
+  /* autoprefixer: ignore next warning */
+  grid-template-areas:
+    'left top-void right'
+    'left center right'
+    'left bottom-void right';
+}
+
+.grid-left {
+  grid-area: left;
+}
+
+.grid-center {
+  grid-area: center;
+}
+
+.grid-right {
+  grid-area: right;
+}
+
+.named {
+  grid-template-rows: 1fr;
+  /* autoprefixer: ignore next warning */
+  grid-template-columns: [content] 1fr;
+}
+
+.gradient {
+  /* autoprefixer: ignore next warning */
+  background: linear-gradient(top, white, black);
+  mask: linear-gradient(top, white, black);
+}

test/cases/ignore-next-warning.out.css

@@ -0,0 +1,58 @@
+.grid {
+  grid-gap: 1px;
+  -ms-grid-columns: 1fr 1px 1fr 1px 1fr;
+  grid-template-columns: repeat(3, 1fr);
+  -ms-grid-rows: 1fr 1px 1fr 1px 1fr;
+  grid-template-rows: repeat(3, 1fr);
+  /* autoprefixer: ignore next warning */
+  grid-template-areas:
+    'left top-void right'
+    'left center right'
+    'left bottom-void right';
+}
+
+.grid-left {
+  -ms-grid-row: 1;
+  -ms-grid-row-span: 5;
+  -ms-grid-column: 1;
+  grid-area: left;
+}
+
+.grid-center {
+  -ms-grid-row: 3;
+  -ms-grid-column: 3;
+  grid-area: center;
+}
+
+.grid-right {
+  -ms-grid-row: 1;
+  -ms-grid-row-span: 5;
+  -ms-grid-column: 5;
+  grid-area: right;
+}
+
+.named {
+  -ms-grid-rows: 1fr;
+  grid-template-rows: 1fr;
+  /* autoprefixer: ignore next warning */
+  -ms-grid-columns: [content] 1fr;
+  grid-template-columns: [content] 1fr;
+}
+
+.named > *:nth-child(1) {
+  -ms-grid-row: 1;
+  -ms-grid-column: 1;
+}
+
+.named > *:nth-child(2) {
+  -ms-grid-row: 1;
+  -ms-grid-column: 2;
+}
+
+.gradient {
+  /* autoprefixer: ignore next warning */
+  background: -webkit-linear-gradient(top, white, black);
+  background: linear-gradient(top, white, black);
+  -webkit-mask: -webkit-linear-gradient(top, white, black);
+  mask: linear-gradient(top, white, black);
+}