Make `IO#each` family without block to return `Enumerator`
MODIFY
mrbgems/mruby-io/mrblib/io.rb
mrbgems/mruby-io/mrblib/io.rb
@@ -303,6 +303,8 @@ class IO
# 15.2.20.5.3
def each(&block)
+ return to_enum unless block
+
while line = self.gets
block.call(line)
end
@@ -311,6 +313,8 @@ class IO
# 15.2.20.5.4
def each_byte(&block)
+ return to_enum(:each_byte) unless block
+
while char = self.getc
block.call(char)
end

Make `IO#each` family without block to return `Enumerator`