From 3a8e39b3a12c2d495fe404b729fdd609a1cf2ae2 Mon Sep 17 00:00:00 2001
From: tompng <tomoyapenguin@gmail.com>
Date: Sat, 25 Oct 2025 16:21:17 +0900
Subject: [PATCH] Fix candidates select to handle encoding error when
 encoding-incompatible method name exists

---
 lib/repl_type_completor/result.rb                    | 6 +++++-
 test/repl_type_completor/test_repl_type_completor.rb | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/repl_type_completor/result.rb b/lib/repl_type_completor/result.rb
index 134b03b..c58a01a 100644
--- a/lib/repl_type_completor/result.rb
+++ b/lib/repl_type_completor/result.rb
@@ -72,7 +72,11 @@ def completion_candidates
       else
         []
       end
-      candidates.select { _1.start_with?(name) }.map { _1[name.size..] }
+
+      candidates.filter_map do
+        _1[name.size..] if _1.start_with?(name)
+      rescue EncodingError
+      end
     rescue Exception => e
       ReplTypeCompletor.handle_exception(e)
       []
diff --git a/test/repl_type_completor/test_repl_type_completor.rb b/test/repl_type_completor/test_repl_type_completor.rb
index 1c06c6d..e67c937 100644
--- a/test/repl_type_completor/test_repl_type_completor.rb
+++ b/test/repl_type_completor/test_repl_type_completor.rb
@@ -218,6 +218,14 @@ def b.foobaz; end
       assert_completion('arr.sample.sample.sample.foo', binding: bind, include: 'bar', exclude: 'baz')
     end
 
+    def test_incompatible_encoding_method
+      a = Object.new
+      a.define_singleton_method(:abc){}
+      a.define_singleton_method("\u{3042}".encode('UTF-16')){}
+      bind = binding
+      assert_completion('a.a', include: 'bc', binding: bind)
+    end
+
     DEPRECATED_CONST = 1
     deprecate_constant :DEPRECATED_CONST
     def test_deprecated_const_without_warning