From: Heesob Park <redmine@...>
Date: 2011-01-05T15:25:43+09:00
Subject: [ruby-core:34083] [Ruby 1.9-Bug#4232][Open] unexpected behavior of '#{}' in irb

Bug #4232: unexpected behavior of '#{}' in irb
http://redmine.ruby-lang.org/issues/show/4232

Author: Heesob Park
Status: Open, Priority: Normal
Category: lib, Target version: 1.9.x
ruby -v: ruby 1.9.3dev (2010-12-31 trunk 30439) [i386-mswin32_90]

In Ruby 1.9.x,

C:\work>irb
irb(main):001:0> a = '#{%}'
irb(main):002:0"

C:\work>irb
irb(main):001:0> a = '#{#}'
irb(main):002:0>


In Ruby 1.8.6,

C:\work>irb
irb(main):001:0> a = '#{%}'
=> "\#{%}"
irb(main):002:0>

C:\work>irb
irb(main):001:0> a = '#{#}'
=> "\#{#}"
irb(main):002:0>

Here is a patch:

--- ruby-lex.rb 2011-01-05 15:05:31.000000000 +0900
+++ ruby-lex.rb.new     2011-01-05 15:05:08.000000000 +0900
@@ -1046,7 +1046,7 @@
       while ch = getc
        if @quoted == ch and nest == 0
          break
-       elsif ch == "#" and peek(0) == "{"
+       elsif @ltype != "'" && ch == "#" and peek(0) == "{"
          identify_string_dvar
        elsif @ltype != "'" && @ltype != "]" && @ltype != ":" and ch == "#"
          subtype = true


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