cy, 11 bytes

Result

WA

Code [DL]

{"ls"} exec

stdin

9727187471999372334553007499107633058200156366106920367034765219839382274770320837010060416060038006

stdout

stderr

RubyError
	@ `exec' (0:4)
/home/esolang/interpreters/cy.rb:730:in `tokenize': undefined method `each_char' for #<Proc:0x00000001874730@/home/esolang/interpreters/cy.rb:582> (NoMethodError)
	from /home/esolang/interpreters/cy.rb:596:in `tokens'
	from /home/esolang/interpreters/cy.rb:658:in `exec'
	from /home/esolang/interpreters/cy.rb:428:in `block in <class:Cy>'
	from /home/esolang/interpreters/cy.rb:80:in `instance_exec'
	from /home/esolang/interpreters/cy.rb:80:in `block (2 levels) in initialize'
	from /home/esolang/interpreters/cy.rb:549:in `block in runMeth'
	from /home/esolang/interpreters/cy.rb:665:in `block in exec'
	from /home/esolang/interpreters/cy.rb:660:in `each'
	from /home/esolang/interpreters/cy.rb:660:in `exec'
	from /home/esolang/interpreters/cy.rb:777:in `block (3 levels) in <main>'
	from /home/esolang/interpreters/cy.rb:844:in `<main>'

strace