After some playing around, I just decided to type
an opening and closing paren:
I then got the following error (trying again after
restarting will not reproduce the error):
----------------------------------------
-- Stack trace at
Cell.cc:47
----------------------------------------
0x7f6acde77de5
__libc_start_main
0x51f53d
Workspace::immediate_execution(bool)
0x461fad
Command::process_line()
0x460eab
Command::process_line(UCS_string&)
0x469de8
Executable::execute_body() const
0x4de0f0
StateIndicator::run()
0x48b17a
Prefix::reduce_statements()
0x489144
Prefix::reduce_END_B__()
0x4e196a
StateIndicator::statement_result(Token&)
0x4bfc7b
Quad_CR::do_CR(long, Value const&)
0x51b8cb
Value::clone(char const*) const
0x4594d1
Cell::init(Cell const&)
0x442e2f
do_Assert(char const*, char const*, char const*, int)
========================================
thrown: at
StateIndicator.cc:40
Pmode: ◊ 1 2
{⎕NC '⍺'} 10)
thrown: at
Prefix.cc:1048
e_msg_2: 'λ1[1]
λ←⍺ ⍺ ⍵ ⍵'
thrown: at
StateIndicator.cc:40
thrown: at
Function.cc:119
thrown: at
Bif_OPER1_REDUCE.cc:69