Use cached module scopes for completion

crates/ra_analysis/src/syntax_ptr.rs

@@ -62,6 +62,11 @@ impl LocalSyntaxPtr {
             local: self,
         }
     }
+
+    // Seems unfortunate to expose
+    pub(crate) fn range(self) -> TextRange {
+        self.range
+    }
 }
 
 #[test]