https://git.ruby-lang.org/ruby.git/commit/?id=0e4ee71546

From 0e4ee71546665744a3c658bc708738b4e01d39ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Mon, 15 Jun 2020 15:23:16 +0900
Subject: rb_io_each_codepoint: do not goto into a branch

I'm not necessarily against every goto in general, but jumping into a
branch is definitely a bad idea.  Better refactor.

diff --git a/io.c b/io.c
index 34e8736..3e0ada4 100644
--- a/io.c
+++ b/io.c
@@ -4173,8 +4173,7 @@ rb_io_each_codepoint(VALUE io) https://github.com/ruby/ruby/blob/trunk/io.c#L4173
 	    rb_yield(UINT2NUM(c));
 	}
 	else if (MBCLEN_INVALID_P(r)) {
-	  invalid:
-	    rb_raise(rb_eArgError, "invalid byte sequence in %s", rb_enc_name(enc));
+            goto invalid;
 	}
 	else if (MBCLEN_NEEDMORE_P(r)) {
 	    char cbuf[8], *p = cbuf;
@@ -4197,6 +4196,9 @@ rb_io_each_codepoint(VALUE io) https://github.com/ruby/ruby/blob/trunk/io.c#L4196
 	}
     }
     return io;
+
+  invalid:
+    rb_raise(rb_eArgError, "invalid byte sequence in %s", rb_enc_name(enc));
 }
 
 /*
-- 
cgit v0.10.2


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