Support Array#first and Array#last, issue #935
Support Array#first and Array#last, issue #935

TJ-Hidetaka-Takano/mrubyc,mrubyc/mrubyc,mrubyc/mrubyc,TJ-Hidetaka-Takano/mrubyc,TJ-Hidetaka-Takano/mrubyc,TJ-Hidetaka-Takano/mrubyc