Display type when completing tuples

crates/ra_ide_api/src/completion/complete_dot.rs

@@ -46,13 +46,14 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty)
                 }
             }
             Ty::Tuple(fields) => {
-                for (i, _ty) in fields.iter().enumerate() {
+                for (i, ty) in fields.iter().enumerate() {
                     CompletionItem::new(
                         CompletionKind::Reference,
                         ctx.source_range(),
                         i.to_string(),
                     )
                     .kind(CompletionItemKind::Field)
+                    .detail(ty.to_string())
                     .add_to(acc);
                 }
             }
@@ -174,4 +175,17 @@ mod tests {
             ",
         );
     }
+
+    #[test]
+    fn test_tuple_field_completion() {
+        check_ref_completion(
+            "tuple_field_completion",
+            r"
+            fn foo() {
+               let b = (0, 3.14);
+               b.<|>
+            }
+            ",
+        );
+    }
 }

crates/ra_ide_api/src/completion/snapshots/completion_item__tuple_field_completion.snap

@@ -0,0 +1,40 @@
+---
+created: "2019-01-24T13:22:02.107228200+00:00"
+creator: insta@0.5.2
+expression: kind_completions
+source: crates/ra_ide_api/src/completion/completion_item.rs
+---
+[
+    CompletionItem {
+        completion_kind: Reference,
+        label: "0",
+        kind: Some(
+            Field
+        ),
+        detail: Some(
+            "i32"
+        ),
+        documentation: None,
+        lookup: None,
+        insert_text: None,
+        insert_text_format: PlainText,
+        source_range: [75; 75),
+        text_edit: None
+    },
+    CompletionItem {
+        completion_kind: Reference,
+        label: "1",
+        kind: Some(
+            Field
+        ),
+        detail: Some(
+            "f64"
+        ),
+        documentation: None,
+        lookup: None,
+        insert_text: None,
+        insert_text_format: PlainText,
+        source_range: [75; 75),
+        text_edit: None
+    }
+]