To reproduce, load a native function:

*      'libemacs' ⎕FX 'EE'*

Then type *]OWNERS* and the interpreter will crash with the following dump:

Value #0:   Flags = COMPLETE, ⍴⊏21⊐ ≡1:
SystemVariable.cc:671

Owners of 0x1dfdaf0:

==============================================================================
Assertion failed: ufun
in Function:      show_owners
in file:          Symbol.cc:1141

Call stack:

----------------------------------------
-- Stack trace at Symbol.cc:1141
----------------------------------------
0x7f5c80282000 __libc_start_main
0x4c3a90  main
0x563624   Workspace::immediate_execution(bool)
0x49f182    Command::process_line()
0x49fb61     Command::process_line(UCS_string&)
0x55b707      Value::list_all(std::ostream&, bool)
0x55b64b       Value::list_one(std::ostream&, bool)
0x564b31        Workspace::show_owners(std::ostream&, Value const&)
0x53686e         SymbolTable::show_owners(std::ostream&, Value const&) const
0x533c40          Symbol::show_owners(std::ostream&, Value const&) const
0x489a30           do_Assert(char const*, char const*, char const*, int)
========================================

SI stack:


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


====================================================
SEGMENTATION FAULT

----------------------------------------
-- Stack trace at main.cc:122
----------------------------------------
0x7f5c80282000 __libc_start_main
0x4c3a90  main
0x563624   Workspace::immediate_execution(bool)
0x49f182    Command::process_line()
0x49fb61     Command::process_line(UCS_string&)
0x55b707      Value::list_all(std::ostream&, bool)
0x55b64b       Value::list_one(std::ostream&, bool)
0x564b31        Workspace::show_owners(std::ostream&, Value const&)
0x53686e         SymbolTable::show_owners(std::ostream&, Value const&) const
0x533c40          Symbol::show_owners(std::ostream&, Value const&) const
0x489a96           do_Assert(char const*, char const*, char const*, int)
0x5406d2            TestFiles::assert_error()
0x7f5c822f24b0
0x4c3224
========================================
====================================================
Segmentation fault (core dumped)

Regards,
Elias

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