DSL EXPRESSION:
call s(1,2,3)


AST:
"block" [tt:block] [nt:StatementBlock]
    "s" [tt:non_sigil_name] [nt:SubroutineCallsite]
        "1" [tt:int_literal] [nt:int_literal]
        "2" [tt:int_literal] [nt:int_literal]
        "3" [tt:int_literal] [nt:int_literal]

