[Bug-apl] Crash when calling file_io with wrong arguments

[Elias Mårtenson]

To reproduce, type the following two commands:

      'file_io' ⎕FX 'IO'

      IO[0] 0

Then the following exception is displayed:

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SEGMENTATION FAULT

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-- Stack trace at main.cc:119

----------------------------------------

0x7f173710cde5 __libc_start_main

0x434b6d  main

0x5205ad   Workspace::immediate_execution(bool)

0x46291d    Command::process_line()

0x46181b     Command::process_line(UCS_string&)

0x46a7e8      Executable::execute_body() const

0x4df3a0       StateIndicator::run()

0x48c98a        Prefix::reduce_statements()

0x488ef7         Prefix::reduce_MISC_F_C_B()

0x4e0564          StateIndicator::eval_XB(Token&, Token&, Token&)

0x480fc4           NativeFunction::eval_XB(Value_P, Value_P)

0x7f1721f520dd            

0x7f1738966bb0             

0x47978a              

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Regards,

Elias