https://git.ruby-lang.org/ruby.git/commit/?id=1c138327e0

From 1c138327e0537bb55f7d0810f6fe7e1c7f63b6c5 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Fri, 28 Aug 2020 22:03:06 +0900
Subject: Try to fix compile error on windows

https://github.com/ruby/ruby/runs/1041040167?check_suite_focus=true#step:11:177
```
compiling ../src/re.c
re.c
../src/re.c(317): error C2057: expected constant expression
../src/re.c(317): error C2466: cannot allocate an array of constant size 0
../src/re.c(467): error C2057: expected constant expression
../src/re.c(467): error C2466: cannot allocate an array of constant size 0
../src/re.c(467): error C2133: 'opts': unknown size
../src/re.c(559): error C2057: expected constant expression
../src/re.c(559): error C2466: cannot allocate an array of constant size 0
../src/re.c(559): error C2133: 'optbuf': unknown size
../src/re.c(673): error C2057: expected constant expression
../src/re.c(673): error C2466: cannot allocate an array of constant size 0
../src/re.c(673): error C2133: 'opts': unknown size
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.27.29110\bin\HostX64\x64\cl.EXE"' : return code '0x2'
Stop.
```

diff --git a/re.c b/re.c
index d0dbfaa..badd321 100644
--- a/re.c
+++ b/re.c
@@ -311,7 +311,7 @@ char_to_option(int c) https://github.com/ruby/ruby/blob/trunk/re.c#L311
     return val;
 }
 
-static const int OPTBUF_SIZE = 4;
+enum { OPTBUF_SIZE = 4 };
 
 static char *
 option_to_str(char str[OPTBUF_SIZE], int options)
-- 
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