From a54564378b16d871bdb29d29fa40a81963ea82df Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Wed, 17 Mar 2021 22:24:51 +0100
Subject: Fix `use crate as <name>;` imports

---
 crates/hir_def/src/nameres/collector.rs | 34 +++++++++++++++++----------------
 crates/hir_def/src/nameres/tests.rs     | 19 ++++++++++++++++++
 2 files changed, 37 insertions(+), 16 deletions(-)

diff --git a/crates/hir_def/src/nameres/collector.rs b/crates/hir_def/src/nameres/collector.rs
index d73f895b7..b5ae5a9e4 100644
--- a/crates/hir_def/src/nameres/collector.rs
+++ b/crates/hir_def/src/nameres/collector.rs
@@ -656,26 +656,28 @@ impl DefCollector<'_> {
                 }
             }
         } else {
-            match import.path.segments().last() {
-                Some(last_segment) => {
-                    let name = match &import.alias {
-                        Some(ImportAlias::Alias(name)) => Some(name.clone()),
-                        Some(ImportAlias::Underscore) => None,
-                        None => Some(last_segment.clone()),
-                    };
-                    log::debug!("resolved import {:?} ({:?}) to {:?}", name, import, def);
-
-                    // extern crates in the crate root are special-cased to insert entries into the extern prelude: rust-lang/rust#54658
-                    if import.is_extern_crate && module_id == self.def_map.root {
-                        if let (Some(def), Some(name)) = (def.take_types(), name.as_ref()) {
-                            self.def_map.extern_prelude.insert(name.clone(), def);
-                        }
+            let name = match &import.alias {
+                Some(ImportAlias::Alias(name)) => Some(name.clone()),
+                Some(ImportAlias::Underscore) => None,
+                None => match import.path.segments().last() {
+                    Some(last_segment) => Some(last_segment.clone()),
+                    None => {
+                        cov_mark::hit!(bogus_paths);
+                        return;
                     }
+                },
+            };
+
+            log::debug!("resolved import {:?} ({:?}) to {:?}", name, import, def);
 
-                    self.update(module_id, &[(name, def)], vis, ImportType::Named);
+            // extern crates in the crate root are special-cased to insert entries into the extern prelude: rust-lang/rust#54658
+            if import.is_extern_crate && module_id == self.def_map.root {
+                if let (Some(def), Some(name)) = (def.take_types(), name.as_ref()) {
+                    self.def_map.extern_prelude.insert(name.clone(), def);
                 }
-                None => cov_mark::hit!(bogus_paths),
             }
+
+            self.update(module_id, &[(name, def)], vis, ImportType::Named);
         }
     }
 
diff --git a/crates/hir_def/src/nameres/tests.rs b/crates/hir_def/src/nameres/tests.rs
index de3aa4f9a..4f2e7a2f9 100644
--- a/crates/hir_def/src/nameres/tests.rs
+++ b/crates/hir_def/src/nameres/tests.rs
@@ -713,3 +713,22 @@ pub fn f() {}
         "#]],
     );
 }
+
+#[test]
+fn use_crate_as() {
+    check(
+        r#"
+use crate as foo;
+
+use foo::bar as baz;
+
+fn bar() {}
+        "#,
+        expect![[r#"
+            crate
+            bar: v
+            baz: v
+            foo: t
+        "#]],
+    );
+}
-- 
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