error_operators.nit:47,11: Syntax Error: binary operator `<=>` requires exactly one parameter; got 0.
error_operators.nit:48,10: Syntax Error: binary operator `<<` requires exactly one parameter; got 0.
error_operators.nit:49,10: Syntax Error: binary operator `>>` requires exactly one parameter; got 0.
error_operators.nit:47,11: Syntax Error: binary operator `<=>` requires exactly one parameter; got 0.
error_operators.nit:48,10: Syntax Error: binary operator `<<` requires exactly one parameter; got 0.
error_operators.nit:49,10: Syntax Error: binary operator `>>` requires exactly one parameter; got 0.