merge revision(s) 60294: [Backport #11638]

Clarify the behavior of IO.write without offset in write mode.

	  https://github.com/ruby/ruby/pull/1571

	  Patch by @takanabe [fix GH-1571]
	  [Bug #11638][ruby-core:71277]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62823 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,12 @@
+Mon Mar 19 00:21:00 2018  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	Clarify the behavior of IO.write without offset in write mode.
+
+	https://github.com/ruby/ruby/pull/1571
+
+	Patch by takanabe (Takayuki Watanabe) [fix GH-1571]
+	[Bug #11638]
+
 Mon Mar 19 00:16:28 2018  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	parse.y: token info with BOM

io.c

@@ -10023,8 +10023,8 @@ io_s_write(int argc, VALUE *argv, int binary)
  *  Opens the file, optionally seeks to the given <i>offset</i>, writes
  *  <i>string</i>, then returns the length written.
  *  <code>write</code> ensures the file is closed before returning.
- *  If <i>offset</i> is not given, the file is truncated.  Otherwise,
- *  it is not truncated.
+ *  If <i>offset</i> is not given in write mode, the file is truncated.
+ *  Otherwise, it is not truncated.
  *
  *  If the last argument is a hash, it specifies option for internal
  *  open().  The key would be the following.  open_args: is exclusive

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.3.7"
 #define RUBY_RELEASE_DATE "2018-03-19"
-#define RUBY_PATCHLEVEL 423
+#define RUBY_PATCHLEVEL 424
 
 #define RUBY_RELEASE_YEAR 2018
 #define RUBY_RELEASE_MONTH 3