From 944f71afc692733cbc151bb3113d45a8159de132 Mon Sep 17 00:00:00 2001
From: Unreal Hoang <unrealhoang@gmail.com>
Date: Tue, 9 Jul 2019 00:02:15 +0900
Subject: projection over std::ops::Try::Ok to infer try/?

---
 crates/ra_hir/src/ty/tests.rs | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'crates/ra_hir/src/ty/tests.rs')

diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index fe5e89f2d..d5c03c4bc 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -20,6 +20,42 @@ use crate::{
 // against snapshots of the expected results using insta. Use cargo-insta to
 // update the snapshots.
 
+#[test]
+fn infer_try() {
+    let (mut db, pos) = MockDatabase::with_position(
+        r#"
+//- /main.rs
+enum Result<O, E> {
+    Ok(O),
+    Err(E)
+}
+
+impl<O, E> ::std::ops::Try for Result<O, E> {
+    type Ok = O;
+    type Error = E;
+}
+fn test() {
+    let r: Result<i32, u64> = Result::Ok(1);
+    let v = r?;
+    v<|>;
+}
+
+//- /lib.rs
+mod ops {
+    trait Try {
+        type Ok;
+        type Error;
+    }
+}
+"#,
+    );
+    db.set_crate_graph_from_fixture(crate_graph! {
+        "main": ("/main.rs", ["std"]),
+        "std": ("/lib.rs", []),
+    });
+    assert_eq!("i32", type_at_pos(&db, pos));
+}
+
 #[test]
 fn infer_for_loop() {
     let (mut db, pos) = MockDatabase::with_position(
@@ -56,6 +92,7 @@ mod iter {
     });
     assert_eq!("&str", type_at_pos(&db, pos));
 }
+
 #[test]
 fn infer_basics() {
     assert_snapshot_matches!(
-- 
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