Issue #5400 has been updated by nobu (Nobuyoshi Nakada).


I agree with Eric.

It is too annoying to rewrite flip-flop.

A patch for flip-flop I found today is:

```diff
diff --git a/tool/enc-unicode.rb b/tool/enc-unicode.rb
index d953014952..c05d02358c 100755
--- a/tool/enc-unicode.rb
+++ b/tool/enc-unicode.rb
@@ -538,6 +538,7 @@
   IO.popen(%W[diff -DUSE_UNICODE_AGE_PROPERTIES #{fds[1].path} #{fds[0].path}], "r") {|age|
     IO.popen(%W[diff -DUSE_UNICODE_PROPERTIES #{fds[2].path} -], "r", in: age) {|f|
       ansi = false
+      in_hash = false
       f.each {|line|
         if /ANSI-C code produced by gperf/ =~ line
           ansi = true
@@ -545,7 +546,7 @@
         line.sub!(/\/\*ANSI\*\//, '1') if ansi
         line.gsub!(/\(int\)\((?:long|size_t)\)&\(\(struct uniname2ctype_pool_t \*\)0\)->uniname2ctype_pool_(str\d+),\s+/,
                    'uniname2ctype_offset(\1), ')
-        if (/^(uniname2ctype_hash) /=~line)..(/^\}/=~line)
+        if !in_hash ? (in_hash = /^(uniname2ctype_hash) / =~ line) : (in_hash = /^\}/!~line; true)
           line.sub!(/^( *(?:register\s+)?(.*\S)\s+hval\s*=\s*)(?=len;)/, '\1(\2)')
         end
         puts line
```

Does this gain readability?

----------------------------------------
Feature #5400: Remove flip-flops in 2.0
https://bugs.ruby-lang.org/issues/5400#change-74136

* Author: judofyr (Magnus Holm)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: Next Major
----------------------------------------
Nobody knows them. Nobody uses them. Let's just get rid of flip-flops, shall we?



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