Thank you for testing.

Closing as fixed.

I pushed the following changeset to the default branch.  Marking as ready for test.

https://hg.savannah.gnu.org/hgweb/octave/rev/96e9dcdc4003

I made an observation on the default branch (ec2635a02328) that might be worth mentioning. When I run the attached minimal working example Octave crashes.

Thread 8 "QThread" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fa0cfe006c0 (LWP 1230747)]
0x00007fa15b89b12d in octave::tree_index_expression::end_pos (this=0x7fa0b8c2b3e0) at libinterp/parse-tree/pt-idx.cc:157
157             return dyn_field->end_pos ();

It must have something to do with the missing “end” statements of the functions, because when I add the “end” keyword to the functions, the example runs fine. The attached script is a guide example that simply opens an empty window. It should be mentioned that guide gui's were running quite well until maybe 6 weeks ago.

I did a bisect and the attached MWE runs without problems with Octave commits prior to this one:

http://hg.savannah.gnu.org/hgweb/octave/rev/d422992b5483

I know those things are all under construction but maybe something is missing here. This is the reason why i am mention it.

#0  0x00007fa15b89b12d in octave::tree_index_expression::end_pos (this=0x7fa0b8c2b3e0) at libinterp/parse-tree/pt-idx.cc:157
#1  0x00007fa15b865eed in octave::tree_simple_assignment::end_pos (this=0x7fa0b82fe930) at libinterp/parse-tree/pt-assign.h:65
#2  0x00007fa15b8a8587 in octave::tree_statement::end_pos (this=0x7fa0b8cbbeb0) at libinterp/parse-tree/pt-stmt.cc:126
#3  0x00007fa15b7bacbb in octave_user_function::maybe_relocate_end_internal (this=0x7fa0b828a7f0) at libinterp/octave-value/ov-usr-fcn.cc:352
#4  0x00007fa15b7bad90 in octave_user_function::maybe_relocate_end (this=0x7fa0b82c9730) at libinterp/octave-value/ov-usr-fcn.cc:372
#5  0x00007fa15b83b3be in octave::parse_fcn_file
    (interp=..., full_file="untitled.m", file="untitled", dir_name="debug", dispatch_type="", package_name="", require_file=true, force_script=false, autoload=false, relative_lookup=false)
    at libinterp/parse-tree/oct-parse.yy:5385
#6  0x00007fa15b83c9f5 in octave::load_fcn_from_file (file_name="untitled.m", dir_name="debug", dispatch_type="", package_name="", fcn_name="", autoload=false)
    at libinterp/parse-tree/oct-parse.yy:5623
#7  0x00007fa15b9f6d9c in octave::fcn_info::fcn_info_rep::find_user_function (this=0x7fa0b82aec40) at libinterp/corefcn/fcn-info.cc:1058
#8  0x00007fa15b9f36f3 in octave::fcn_info::fcn_info_rep::load_class_constructor (this=0x7fa0b82aec40) at libinterp/corefcn/fcn-info.cc:131
#9  0x00007fa15b9f5c90 in octave::fcn_info::fcn_info_rep::xfind (this=0x7fa0b82aec40, search_scope=..., args=...) at libinterp/corefcn/fcn-info.cc:775
#10 0x00007fa15b9f4530 in octave::fcn_info::fcn_info_rep::find (this=0x7fa0b82aec40, scope=..., args=...) at libinterp/corefcn/fcn-info.cc:358
#11 0x00007fa15bdf67bd in octave::fcn_info::find (this=0x7fa0cfdfe1b0, search_scope=..., args=...) at libinterp/corefcn/fcn-info.h:251
#12 0x00007fa15bdf3926 in octave::symbol_table::fcn_table_find (this=0x7fa0b8002580, name="untitled", args=..., search_scope_arg=...) at libinterp/corefcn/symtab.cc:242
#13 0x00007fa15bdf3c6f in octave::symbol_table::find_function (this=0x7fa0b8002580, name="untitled", args=..., search_scope=...) at libinterp/corefcn/symtab.cc:289
#14 0x00007fa15bdf3b91 in octave::symbol_table::find_function (this=0x7fa0b8002580, name="untitled", search_scope_arg=...) at libinterp/corefcn/symtab.cc:277
#15 0x00007fa15b8997cd in octave::tree_identifier::evaluate_n (this=0x7fa0b8c86040, tw=..., nargout=0) at libinterp/parse-tree/pt-id.cc:104
#16 0x00007fa15b89a0df in octave::tree_identifier::evaluate (this=0x7fa0b8c86040, tw=..., nargout=0) at libinterp/parse-tree/pt-id.h:101
#17 0x00007fa15b87b9d4 in octave::tree_evaluator::visit_statement (this=0x7fa0b80015e8, stmt=...) at libinterp/parse-tree/pt-eval.cc:4068
#18 0x00007fa15b8a9504 in octave::tree_statement::accept (this=0x7fa0b8b18910, tw=...) at libinterp/parse-tree/pt-stmt.h:125
#19 0x00007fa15b87beb9 in octave::tree_evaluator::visit_statement_list (this=0x7fa0b80015e8, lst=...) at libinterp/parse-tree/pt-eval.cc:4153
#20 0x00007fa15b64be72 in octave::tree_statement_list::accept (this=0x7fa0b8c36ec0, tw=...) at libinterp/parse-tree/pt-stmt.h:215
#21 0x00007fa15b87078a in octave::tree_evaluator::eval (this=0x7fa0b80015e8, stmt_list=std::shared_ptr<octave::tree_statement_list> (use count 2, weak count 0) = {...}, interactive=true) at libinterp/parse-tree/pt-eval.cc:1000
#22 0x00007fa15b86fda9 in octave::tree_evaluator::repl (this=0x7fa0b80015e8) at libinterp/parse-tree/pt-eval.cc:817
#23 0x00007fa15bc4faaf in octave::interpreter::main_loop (this=0x7fa0b80013f0) at libinterp/corefcn/interpreter.cc:1336