fix #2377 super::super::*

crates/ra_hir_def/src/nameres/tests.rs

@@ -65,6 +65,42 @@ enum E { V }
     "###)
 }
 
+#[test]
+fn crate_def_map_super_super() {
+    let map = def_map(
+        "
+        //- /lib.rs
+        mod a {
+            const A: usize = 0;
+
+            mod b {
+                const B: usize = 0;
+
+                mod c {
+                    use super::super::*;
+                }
+            }
+        }
+        ",
+    );
+    assert_snapshot!(map, @r###"
+        ⋮crate
+        ⋮a: t
+        ⋮
+        ⋮crate::a
+        ⋮A: v
+        ⋮b: t
+        ⋮
+        ⋮crate::a::b
+        ⋮B: v
+        ⋮c: t
+        ⋮
+        ⋮crate::a::b::c
+        ⋮A: v
+        ⋮b: t
+    "###)
+}
+
 #[test]
 fn bogus_paths() {
     covers!(bogus_paths);

crates/ra_hir_def/src/path/lower/lower_use.rs

@@ -103,10 +103,13 @@ fn convert_path(prefix: Option<ModPath>, path: ast::Path, hygiene: &Hygiene) ->
             ModPath::from_segments(PathKind::Super(0), iter::empty())
         }
         ast::PathSegmentKind::SuperKw => {
-            if prefix.is_some() {
-                return None;
-            }
-            ModPath::from_segments(PathKind::Super(1), iter::empty())
+            let nested_super_count = match prefix.map(|p| p.kind) {
+                Some(PathKind::Super(n)) => n,
+                Some(_) => return None,
+                None => 0,
+            };
+
+            ModPath::from_segments(PathKind::Super(nested_super_count + 1), iter::empty())
         }
         ast::PathSegmentKind::Type { .. } => {
             // not allowed in imports