From 34dc8d25c1e461cc311d6d4404f74502513cd3ae Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Wed, 18 Mar 2020 17:47:59 +0800
Subject: Add basic custom derive lowering

---
 crates/ra_hir_ty/src/tests/macros.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'crates/ra_hir_ty/src')

diff --git a/crates/ra_hir_ty/src/tests/macros.rs b/crates/ra_hir_ty/src/tests/macros.rs
index 2e309a379..d59e4eea6 100644
--- a/crates/ra_hir_ty/src/tests/macros.rs
+++ b/crates/ra_hir_ty/src/tests/macros.rs
@@ -639,3 +639,26 @@ mod clone {
     );
     assert_eq!("(Wrapper<S>, {unknown})", type_at_pos(&db, pos));
 }
+
+#[test]
+fn infer_custom_derive_simple() {
+    let (db, pos) = TestDB::with_position(
+        r#"
+//- /main.rs crate:main deps:foo
+use foo::Foo;
+
+#[derive(Foo)]
+struct S{}
+
+fn test() {
+    S{}<|>;
+}
+
+//- /lib.rs crate:foo
+#[proc_macro_derive(Foo)]
+pub fn derive_foo(_item: TokenStream) -> TokenStream {    
+}
+"#,
+    );
+    assert_eq!("S", type_at_pos(&db, pos));
+}
-- 
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