Activate specs for issue 1415

This PR activates specs for sass/libsass#1415

spec/libsass-closed-issues/issue_1415/direct/input.scss

@@ -0,0 +1,5 @@
+@if & {
+  foo {
+    foo: bar;
+  }
+}

spec/libsass-closed-issues/issue_1415/mixin/expected.compact.css

@@ -0,0 +1,3 @@
+.foo bar { color: red; }
+
+.foo bar baz { color: red; }

spec/libsass-closed-issues/issue_1415/mixin/expected.compressed.css

@@ -0,0 +1 @@
+.foo bar{color:red}.foo bar baz{color:red}

spec/libsass-closed-issues/issue_1415/mixin/expected.expanded.css

@@ -0,0 +1,7 @@
+.foo bar {
+  color: red;
+}
+
+.foo bar baz {
+  color: red;
+}

spec/libsass-closed-issues/issue_1415/mixin/expected_output.css

@@ -0,0 +1,5 @@
+.foo bar {
+  color: red; }
+
+.foo bar baz {
+  color: red; }

spec/libsass-closed-issues/issue_1415/mixin/input.scss

@@ -0,0 +1,27 @@
+@mixin prepend-foo {
+  $parent: &;
+
+  @if $parent {
+    .foo & {
+      @content;
+    }
+  } @else {
+    .foo {
+      @content;
+    }
+  }
+}
+
+@include prepend-foo {
+  bar {
+    color: red;
+  }
+}
+
+bar {
+  @include prepend-foo {
+    baz {
+      color: red;
+    }
+  }
+}

spec/libsass-closed-issues/issue_1415/variable/input.scss

@@ -0,0 +1,7 @@
+$parent: &;
+
+@if $parent {
+  foo {
+    foo: bar;
+  }
+}