[Bug-apl] Assertion failure in setup_one_lambda

[Kacper Gutowski]

Hi,
Tokenizer fails to catch unbalanced brackets when input is just "{⋄}"
which triggers assertion in setup_one_lambda:

      {⋄}

==============================================================================
Assertion failed: bend < body.size()
in Function:      setup_one_lambda
in file:          Executable.cc:546

Call stack:

----------------------------------------
-- Stack trace at Executable.cc:546
----------------------------------------
0x7FAF829C4B17 __libc_start_main
0x563003451715  main
0x5630035BE83D   Workspace::immediate_execution(bool)
0x5630034A2121    Command::process_line()
0x5630034A2910     Command::do_APL_expression(UCS_string&)
0x5630034B1A91      StatementList::fix(UCS_string const&, char const*)
0x5630034B1686       Executable::setup_lambdas()
0x5630034B153B        Executable::setup_one_lambda(long, int)
0x563003464BBA         do_Assert(char const*, char const*, char const*, int)
========================================

SI stack:


==============================================================================
*** Command::process_line() caught other exception ***

Goodbye.

-k