https://git.ruby-lang.org/ruby.git/commit/?id=cf74755921

From cf74755921623225b30d592a83792c43677b9f52 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sun, 10 Oct 2021 22:47:30 -0700
Subject: [ruby/irb] Revert "Optimize show_source command further"

This reverts commit 27dd2867cda5c789efaa5078214ad2fd82adcebf.

This is to fix the test I added.

(I separated commits to test a new behavior of ruby-commit-hook)

https://github.com/ruby/irb/commit/fe055d521a
---
 lib/irb/cmd/show_source.rb | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/irb/cmd/show_source.rb b/lib/irb/cmd/show_source.rb
index feff8315f6..dcba1d1c71 100644
--- a/lib/irb/cmd/show_source.rb
+++ b/lib/irb/cmd/show_source.rb
@@ -61,15 +61,12 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/cmd/show_source.rb#L61
         lex = RubyLex.new
         lines = File.read(file).lines[(first_line - 1)..-1]
         tokens = RubyLex.ripper_lex_without_warning(lines.join)
-
-        code = +""
         prev_tokens = []
 
         # chunk with line number
         tokens.chunk { |tok| tok[0][0] }.each do |lnum, chunk|
-          code << lines[lnum]
+          code = lines[0..lnum].join
           prev_tokens.concat chunk
-
           continue = lex.process_continue(prev_tokens)
           code_block_open = lex.check_code_block(code, prev_tokens)
           if !continue && !code_block_open
-- 
cgit v1.2.1


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