Add test for Self not being a generic in search index

tests/rustdoc-js/self-is-not-generic.js

@@ -0,0 +1,22 @@
+// exact-check
+
+const EXPECTED = [
+    {
+        'query': 'A -> A',
+        'others': [
+            { 'path': 'self_is_not_generic::Thing', 'name': 'from' }
+        ],
+    },
+    {
+        'query': 'A -> B',
+        'others': [
+            { 'path': 'self_is_not_generic::Thing', 'name': 'try_from' }
+        ],
+    },
+    {
+        'query': 'Combine -> Combine',
+        'others': [
+            { 'path': 'self_is_not_generic::Combine', 'name': 'combine' }
+        ],
+    }
+];

tests/rustdoc-js/self-is-not-generic.rs

@@ -0,0 +1,11 @@
+pub trait Combine {
+    fn combine(&self, other: &Self) -> Self;
+}
+
+pub struct Thing;
+
+impl Combine for Thing {
+    fn combine(&self, other: &Self) -> Self {
+        Self
+    }
+}