From fe0403b96323692d2ec3ebf2fc8c46fb76f8b49b Mon Sep 17 00:00:00 2001
From: TSUYUSATO Kitsune <make.just.on@gmail.com>
Date: Mon, 6 May 2019 08:46:59 +0900
Subject: [PATCH] Implementation: allow to lookup implementations of class and
 module

Closes #4941
---
 src/compiler/crystal/tools/implementations.cr | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/compiler/crystal/tools/implementations.cr b/src/compiler/crystal/tools/implementations.cr
index 1ac2e49e4c1a..08c4c85a5d9b 100644
--- a/src/compiler/crystal/tools/implementations.cr
+++ b/src/compiler/crystal/tools/implementations.cr
@@ -116,6 +116,15 @@ module Crystal
       end
     end
 
+    def visit(node : Path)
+      return contains_target(node) unless (loc = node.location) && (end_loc = node.end_location) && @target_location.between?(loc, end_loc)
+
+      target = node.target_const || node.type?.try &.instance_type
+      target.try &.locations.try &.each do |loc|
+        @locations << loc
+      end
+    end
+
     def visit(node)
       contains_target(node)
     end