Handle names prefixed by :: when accessing index

lib/ruby_indexer/lib/ruby_indexer/index.rb

@@ -50,7 +50,7 @@ def <<(entry)
 
     sig { params(fully_qualified_name: String).returns(T.nilable(T::Array[Entry])) }
     def [](fully_qualified_name)
-      @entries[fully_qualified_name]
+      @entries[fully_qualified_name.delete_prefix("::")]
     end
 
     # Try to find the entry based on the nesting from the most specific to the least specific. For example, if we have

lib/ruby_indexer/test/index_test.rb

@@ -78,5 +78,25 @@ class Something
 
       assert_nil(@index.resolve("DoesNotExist", ["Foo"]))
     end
+
+    def test_accessing_with_colon_colon_prefix
+      RubyIndexer.index_single(@index, "/fake/path/foo.rb", <<~RUBY)
+        class Bar; end
+
+        module Foo
+          class Bar
+          end
+
+          class Baz
+            class Something
+            end
+          end
+        end
+      RUBY
+
+      entries = @index["::Foo::Baz::Something"]
+      refute_empty(entries)
+      assert_equal("Foo::Baz::Something", entries.first.name)
+    end
   end
 end