Add coverage for infix and derive

Author: purefunctor

crates/indexing/tests/indexing.rs

@@ -90,6 +90,9 @@ fn duplicate_expr_item() {
         "ord = ordImpl",
         "data Data = Id Int",
         "newtype Newtype = Id Int",
+        "infix 5 eq as ==",
+        "infix 5 eq as ==",
+        "derive instance eq :: Eq a",
     ]);
     insta::assert_debug_snapshot!(errors);
 }
@@ -106,7 +109,9 @@ fn duplicate_type_item() {
         "data Newtype = Constructor3",
         "data Newtype :: Type",
         "data Id = Constructor4",
-        "data Id = Constructor5"
+        "data Id = Constructor5",
+        "infix 5 type Eq as ==",
+        "infix 5 type Eq as ==",
     ]);
     insta::assert_debug_snapshot!(errors);
 }

crates/indexing/tests/snapshots/indexing__duplicate_expr_item.snap

@@ -64,4 +64,24 @@ snapshot_kind: text
             ),
         ),
     },
+    DuplicateExprItem {
+        item_id: Id(
+            3,
+        ),
+        duplicate: Declaration(
+            Id(
+                10,
+            ),
+        ),
+    },
+    DuplicateExprItem {
+        item_id: Id(
+            0,
+        ),
+        duplicate: Declaration(
+            Id(
+                11,
+            ),
+        ),
+    },
 ]

crates/indexing/tests/snapshots/indexing__duplicate_type_item.snap

@@ -72,4 +72,14 @@ snapshot_kind: text
             9,
         ),
     },
+    DuplicateTypeItem {
+        item_id: Id(
+            3,
+        ),
+        duplicate: Declaration(
+            Id(
+                11,
+            ),
+        ),
+    },
 ]

crates/indexing/tests/snapshots/indexing__infix_errors.snap

@@ -0,0 +1,27 @@
+---
+source: crates/indexing/tests/indexing.rs
+expression: errors
+snapshot_kind: text
+---
+[
+    DuplicateExprItem {
+        item_id: Id(
+            0,
+        ),
+        duplicate: Declaration(
+            Id(
+                2,
+            ),
+        ),
+    },
+    DuplicateTypeItem {
+        item_id: Id(
+            0,
+        ),
+        duplicate: Declaration(
+            Id(
+                3,
+            ),
+        ),
+    },
+]