merge revision(s) f748b911c9157a0bb86f38280ddfba72a55049b6: [Backport #17729]

	Fix infinite loop at illegal sequence [Bug #17729]

	As mblen returns -1 on failure, skip the first byte and try the
	succeeding bytes in that case.

	Close https://github.com/ruby/ruby/pull/4281
	---
	 eval_intern.h                 | 11 ++++++++++-
	 test/ruby/test_rubyoptions.rb |  5 +++++
	 2 files changed, 15 insertions(+), 1 deletion(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/version.h b/version.h
index 5f07f2c35e..15531eb1ce 100644
--- a/version.h
+++ b/version.h
@@ -12,7 +12,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 58
+#define RUBY_PATCHLEVEL 59
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 4