From 9e8f4d31a40eca605a047ed95a98aac43a3e327f Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Tue, 23 Feb 2021 23:31:07 +0100
Subject: Pickup ConstReference patterns in FindUsages

---
 crates/ide/src/references.rs | 25 +++++++++++++++++++++++++
 crates/ide_db/src/search.rs  | 15 +++++++++++----
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/crates/ide/src/references.rs b/crates/ide/src/references.rs
index 55f95ebae..5d0449e56 100644
--- a/crates/ide/src/references.rs
+++ b/crates/ide/src/references.rs
@@ -1224,4 +1224,29 @@ fn test() {}
             "#]],
         );
     }
+
+    #[test]
+    fn test_const_in_pattern() {
+        check(
+            r#"
+const A$0: i32 = 42;
+
+fn main() {
+    match A {
+        A => (),
+        _ => (),
+    }
+    if let A = A {}
+}
+"#,
+            expect![[r#"
+                A Const FileId(0) 0..18 6..7
+
+                FileId(0) 42..43
+                FileId(0) 54..55
+                FileId(0) 97..98
+                FileId(0) 101..102
+            "#]],
+        );
+    }
 }
diff --git a/crates/ide_db/src/search.rs b/crates/ide_db/src/search.rs
index ba8bea002..ddcfbd3f3 100644
--- a/crates/ide_db/src/search.rs
+++ b/crates/ide_db/src/search.rs
@@ -416,10 +416,11 @@ impl<'a> FindUsages<'a> {
         sink: &mut dyn FnMut(FileId, FileReference) -> bool,
     ) -> bool {
         match NameClass::classify(self.sema, name) {
-            Some(NameClass::PatFieldShorthand { local_def: _, field_ref }) => {
-                if !matches!(self.def, Definition::Field(_) if &field_ref == self.def) {
-                    return false;
-                }
+            Some(NameClass::PatFieldShorthand { local_def: _, field_ref })
+                if matches!(
+                    self.def, Definition::Field(_) if &field_ref == self.def
+                ) =>
+            {
                 let FileRange { file_id, range } = self.sema.original_range(name.syntax());
                 let reference = FileReference {
                     range,
@@ -429,6 +430,12 @@ impl<'a> FindUsages<'a> {
                 };
                 sink(file_id, reference)
             }
+            Some(NameClass::ConstReference(def)) if *self.def == def => {
+                let FileRange { file_id, range } = self.sema.original_range(name.syntax());
+                let reference =
+                    FileReference { range, name: ast::NameLike::Name(name.clone()), access: None };
+                sink(file_id, reference)
+            }
             _ => false, // not a usage
         }
     }
-- 
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