[Bug-apl] Crash when evaluating a jump to undefined location

[Elias Mårtenson]

To reproduce, simply type the following into the prompt:

⍎"→3"

The result is the following:

==============================================================================

Assertion failed: pc_from_to.low <= pc_from_to.high

in Function:      set_error_info

in file:          Executable.cc:269

Call stack:

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

-- Stack trace at Executable.cc:269

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

0xa @@@@

0xa  @@@@

0xa   @@@@

0xa    @@@@

0xa     @@@@

0xa      @@@@

0xa       @@@@

0xa        @@@@

0xa         @@@@

========================================

SI stack:

Depth:    1

Exec:     0x7f978340d710

Pmode:    ⍎  →3

PC:       3

==============================================================================

Assertion failed: idx < items_valid

in Function:      operator[]

in file:          Simple_string.hh:144

Call stack:

*** do_Assert() called recursively ***

==============================================================================

terminate called throwing an exception

Process apl abort trap: 6