Fix File.utime to return the number of file names in the arguments

Author: bjfish

CHANGELOG.md

@@ -38,6 +38,7 @@ Compatibility:
 * Update `String#rindex` to only accept `Regexp` or objects convertable to `String` as the first parameter (#2608, @bjfish).
 * Update `String#<<` to require one argument (#2609, @bjfish).
 * Update `String#split` to raise `TypeError` when false is given (#2606, @bjfish).
+* Update `File.utime` to return the number of file names in the arguments (#2616, @bjfish).
 
 Performance:
 

spec/ruby/core/file/utime_spec.rb

@@ -77,6 +77,10 @@
     File.mtime(@file1).nsec.should.between?(0, 123500000)
   end
 
+  it "returns the number of filenames in the arguments" do
+    File.utime(@atime.to_f, @mtime.to_f, @file1, @file2).should == 2
+  end
+
   platform_is :linux do
     platform_is wordsize: 64 do
       it "allows Time instances in the far future to set mtime and atime (but some filesystems limit it up to 2446-05-10 or 2038-01-19)" do

src/main/ruby/truffleruby/core/file.rb

@@ -1116,6 +1116,7 @@ def self.utime(atime, mtime, *paths)
                                           mtime.to_i, mtime.nsec)
       Errno.handle unless n == 0
     end
+    paths.size
   end
 
   def self.world_readable?(path)