https://git.ruby-lang.org/ruby.git/commit/?id=cce72a2411

From cce72a24119b5c2177100865f52376ca4b32bd9d Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sat, 26 Dec 2020 23:34:27 +0900
Subject: [ruby/irb] Newline in oneliner def doesn't reset indent

This closes ruby/irb#132.

https://github.com/ruby/irb/commit/43456dcf5e

diff --git a/lib/irb/ruby-lex.rb b/lib/irb/ruby-lex.rb
index 9914aec..68751b4 100644
--- a/lib/irb/ruby-lex.rb
+++ b/lib/irb/ruby-lex.rb
@@ -410,7 +410,7 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L410
 
       case t[1]
       when :on_ignored_nl, :on_nl, :on_comment
-        if index != (@tokens.size - 1)
+        if index != (@tokens.size - 1) and in_oneliner_def != :BODY
           depth_difference = 0
           open_brace_on_line = 0
         end
@@ -488,11 +488,13 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L488
 
       case t[1]
       when :on_ignored_nl, :on_nl, :on_comment
-        corresponding_token_depth = nil
-        spaces_at_line_head = 0
-        is_first_spaces_of_line = true
-        is_first_printable_of_line = true
-        open_brace_on_line = 0
+        if in_oneliner_def != :BODY
+          corresponding_token_depth = nil
+          spaces_at_line_head = 0
+          is_first_spaces_of_line = true
+          is_first_printable_of_line = true
+          open_brace_on_line = 0
+        end
         next
       when :on_sp
         spaces_at_line_head = t[2].count(' ') if is_first_spaces_of_line
diff --git a/test/irb/test_ruby_lex.rb b/test/irb/test_ruby_lex.rb
index 41b5d49..30bae1e 100644
--- a/test/irb/test_ruby_lex.rb
+++ b/test/irb/test_ruby_lex.rb
@@ -263,6 +263,23 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_ruby_lex.rb#L263
       end
     end
 
+    def test_oneliner_def_in_multiple_lines
+      input_with_correct_indents = [
+        Row.new(%q(def a()=[), nil, 4, 2),
+        Row.new(%q(  1,), nil, 4, 1),
+        Row.new(%q(].), 0, 0, 0),
+        Row.new(%q(to_s), nil, 0, 0),
+      ]
+
+      lines = []
+      input_with_correct_indents.each do |row|
+        lines << row.content
+        assert_indenting(lines, row.current_line_spaces, false)
+        assert_indenting(lines, row.new_line_spaces, true)
+        assert_nesting_level(lines, row.nesting_level)
+      end
+    end
+
     PromptRow = Struct.new(:prompt, :content)
 
     class MockIO_DynamicPrompt
-- 
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