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Error on some of the ncurses tutorial examples e.g. for ncurses/menu.e


From: Aaron Cook
Subject: Error on some of the ncurses tutorial examples e.g. for ncurses/menu.e
Date: Sun, 21 Nov 2021 22:00:35 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0 SeaMonkey/2.53.7.1

Hello,
I have been working through compiling and running some of the tutorial examples, and I am encountering errors with some of the ncurses tutorial examples. The examples ncurses/hello.e and ncurses/pad.e seem to run ok for me, but others such as  ncurses/menu.e give an error.
See below for the output I get from compiling and running ncurses/menu.e

I'm not sure if others can compile and run this example ok?
I am very far from being an expert, so it could well be a setup issue with my system. FYI - I am running liberty eiffel bell on Slackware Linux 14.2, 64 bit version.

Thanks very much for any help, or pointers in the right direction :).

Best wishes, Aaron

----
bash-4.3$ se compile menu.e -o menu
bash-4.3$ ./menu
12 frames in run-time stack.
====  Bottom of run-time stack  ====
<system root>
Current = MENU#0x2077078
    [ menubar = Void
      root_window = #0x2134558
    ]
line 15 column 4 file /home/aaron/Eiffel/liberty-eiffel/tutorial/ncurses/menu.e
======================================
make MENU
Current = MENU#0x2077078
    [ menubar = Void
      root_window = #0x2134558
    ]
items = HASHED_DICTIONARY[HASHED_DICTIONARY[STRING,STRING],STRING]#0x21478f8
    [ free_nodes = #0x2149908
      cache_node = #0x21619b8
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[HASHED_DICTIONARY[STRING,STRING],STRING]]#0x214b930
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 28
    ]
item = HASHED_DICTIONARY[STRING,STRING]#0x21539a8
    [ free_nodes = #0x2155938
      cache_node = #0x215fa98
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[STRING,STRING]]#0x2157cc0
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 30
    ]
line 43 column 30 file /home/aaron/Eiffel/liberty-eiffel/tutorial/ncurses/menu.e
======================================
make NCURSES_MENUBAR[STRING]
Current = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
p = NCURSES_WINDOW#0x2134558
    [ children = #0x2165a78
      parent = Void
      widget = POINTER#0x20b85a0
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
y = 0
mns = HASHED_DICTIONARY[HASHED_DICTIONARY[STRING,STRING],STRING]#0x21478f8
    [ free_nodes = #0x2149908
      cache_node = #0x21619b8
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[HASHED_DICTIONARY[STRING,STRING],STRING]]#0x214b930
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 28
    ]
with_border = True
m = 3
i = 4
x = 14
items = ARRAY[NCURSES_MENU_ITEM[STRING]]#0x2179b08
    [ storage = NATIVE_ARRAY[NCURSES_MENU_ITEM[STRING]]#0x217bb20
      lower = 1
      generation = 4
      capacity = 3
      upper = 3
    ]
line 203 column 77 file /usr/local/bell/src/lib/ncurses/ncurses_menubar.e
======================================
create expression wrapper
======================================
make NCURSES_MENU[STRING]
Current = NCURSES_MENU[STRING]#0x2185b98
    [ tag = "menu 3"
      window = Void
      last_choice_memory = Void
      children = Void
      parent = #0x2163978
      items = #0x2179b08
      width = 8
      top = 1
      left = 14
      selected = 1
      height = 5
      valid_choice = False
      hidden = False
      has_border = True
      is_children_drawing_disable = False
    ]
p = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
x = 14
y = 1
t = "menu 3"
its = ARRAY[NCURSES_MENU_ITEM[STRING]]#0x2179b08
    [ storage = NATIVE_ARRAY[NCURSES_MENU_ITEM[STRING]]#0x217bb20
      lower = 1
      generation = 4
      capacity = 3
      upper = 3
    ]
with_border = True
i = 4
line 153 column 51 file /usr/local/bell/src/lib/ncurses/ncurses_menu.e
======================================
create_sub_window NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134590
    [ children = #0x2165ac8
      parent = #0x2134558
      widget = POINTER#0x2165970
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
x = 14
y = 1
columns = 8
lines = 5
Result = Void
line 258 column 49 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
make_sub_window NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
w = NCURSES_WINDOW#0x2134590
    [ children = #0x2165ac8
      parent = #0x2134558
      widget = POINTER#0x2165970
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
x = 14
y = 1
columns = 8
lines = 5
line 728 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
init NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
line 743 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
set_cursor NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
y = 0
line 150 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
valid_cursor NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
y = 0
Result = False
line 161 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
valid_cursor_x NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
Result = False
line 120 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
width NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = False
      hidden = False
      is_children_drawing_disable = False
    ]
Result = -6
line 172 column 17 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
====  Top of run-time stack   ====
*** Error at Run Time ***: Class Invariant Violation.
*** Error at Run Time ***: window /= Void
18 frames in run-time stack.
====  Bottom of run-time stack  ====
<system root>
Current = MENU#0x2077078
    [ menubar = Void
      root_window = #0x2134558
    ]
line 15 column 4 file /home/aaron/Eiffel/liberty-eiffel/tutorial/ncurses/menu.e
======================================
make MENU
Current = MENU#0x2077078
    [ menubar = Void
      root_window = #0x2134558
    ]
items = HASHED_DICTIONARY[HASHED_DICTIONARY[STRING,STRING],STRING]#0x21478f8
    [ free_nodes = #0x2149908
      cache_node = #0x21619b8
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[HASHED_DICTIONARY[STRING,STRING],STRING]]#0x214b930
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 28
    ]
item = HASHED_DICTIONARY[STRING,STRING]#0x21539a8
    [ free_nodes = #0x2155938
      cache_node = #0x215fa98
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[STRING,STRING]]#0x2157cc0
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 30
    ]
line 43 column 30 file /home/aaron/Eiffel/liberty-eiffel/tutorial/ncurses/menu.e
======================================
make NCURSES_MENUBAR[STRING]
Current = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
p = NCURSES_WINDOW#0x2134558
    [ children = #0x2165a78
      parent = Void
      widget = POINTER#0x20b85a0
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
y = 0
mns = HASHED_DICTIONARY[HASHED_DICTIONARY[STRING,STRING],STRING]#0x21478f8
    [ free_nodes = #0x2149908
      cache_node = #0x21619b8
      buckets = NATIVE_ARRAY[HASHED_DICTIONARY_NODE[HASHED_DICTIONARY[STRING,STRING],STRING]]#0x214b930
      count = 3
      cache_user = 3
      generation = 3
      capacity = 53
      cache_buckets = 28
    ]
with_border = True
m = 3
i = 4
x = 14
items = ARRAY[NCURSES_MENU_ITEM[STRING]]#0x2179b08
    [ storage = NATIVE_ARRAY[NCURSES_MENU_ITEM[STRING]]#0x217bb20
      lower = 1
      generation = 4
      capacity = 3
      upper = 3
    ]
line 203 column 77 file /usr/local/bell/src/lib/ncurses/ncurses_menubar.e
======================================
create expression wrapper
======================================
make NCURSES_MENU[STRING]
Current = NCURSES_MENU[STRING]#0x2185b98
    [ tag = "menu 3"
      window = Void
      last_choice_memory = Void
      children = Void
      parent = #0x2163978
      items = #0x2179b08
      width = 8
      top = 1
      left = 14
      selected = 1
      height = 5
      valid_choice = False
      hidden = False
      has_border = True
      is_children_drawing_disable = False
    ]
p = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
x = 14
y = 1
t = "menu 3"
its = ARRAY[NCURSES_MENU_ITEM[STRING]]#0x2179b08
    [ storage = NATIVE_ARRAY[NCURSES_MENU_ITEM[STRING]]#0x217bb20
      lower = 1
      generation = 4
      capacity = 3
      upper = 3
    ]
with_border = True
i = 4
line 153 column 51 file /usr/local/bell/src/lib/ncurses/ncurses_menu.e
======================================
create_sub_window NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134590
    [ children = #0x2165ac8
      parent = #0x2134558
      widget = POINTER#0x2165970
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
x = 14
y = 1
columns = 8
lines = 5
Result = Void
line 258 column 49 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
make_sub_window NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
w = NCURSES_WINDOW#0x2134590
    [ children = #0x2165ac8
      parent = #0x2134558
      widget = POINTER#0x2165970
      last_keypress = 0
      get_fg_color = 7
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
x = 14
y = 1
columns = 8
lines = 5
line 728 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
init NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
line 743 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
set_cursor NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
y = 0
line 150 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
valid_cursor NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
y = 0
Result = False
line 161 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
valid_cursor_x NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
x = 0
Result = False
line 120 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
width NCURSES_WINDOW
Current = NCURSES_WINDOW#0x2134638
    [ children = Void
      parent = #0x2134590
      widget = POINTER#0x2187ca0
      last_keypress = 0
      get_fg_color = 0
      get_bg_color = 0
      disposed = True
      hidden = False
      is_children_drawing_disable = False
    ]
Result = -6
line 172 column 17 file /usr/local/bell/src/lib/ncurses/ncurses_window.e
======================================
Garbage Collector at work.
dispose called (during sweep phase)
======================================
dispose NCURSES_MENUBAR[STRING]
Current = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
line 189 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_widget.e
======================================
delete NCURSES_MENUBAR[STRING]
Current = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
line 136 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_widget.e
======================================
dispose_children NCURSES_MENUBAR[STRING]
Current = NCURSES_MENUBAR[STRING]#0x2163978
    [ window = #0x2134590
      parent = Void
      children = #0x2165aa0
      menus = #0x216fa98
      last_choice_memory = Void
      top = 0
      height = 6
      width = 239
      selected = 0
      left = 0
      is_children_drawing_disable = False
      hidden = False
      valid_choice = False
    ]
i = 2
line 204 column 30 file /usr/local/bell/src/lib/ncurses/ncurses_widget.e
======================================
delete NCURSES_MENU[STRING]
Current = NCURSES_MENU[STRING]#0x2185b98
    [ tag = "menu 3"
      window = Void
      last_choice_memory = Void
      children = Void
      parent = #0x2163978
      items = #0x2179b08
      width = 8
      top = 1
      left = 14
      selected = 1
      height = 5
      valid_choice = False
      hidden = False
      has_border = True
      is_children_drawing_disable = False
    ]
line 136 column 10 file /usr/local/bell/src/lib/ncurses/ncurses_widget.e
======================================
invariant NCURSES_MENU[STRING]
Current = NCURSES_MENU[STRING]#0x2185b98
    [ tag = "menu 3"
      window = Void
      last_choice_memory = Void
      children = Void
      parent = #0x2163978
      items = #0x2179b08
      width = 8
      top = 1
      left = 14
      selected = 1
      height = 5
      valid_choice = False
      hidden = False
      has_border = True
      is_children_drawing_disable = False
    ]
line 166 column 4 file /usr/local/bell/src/lib/ncurses/ncurses_menu.e
====  Top of run-time stack   ====
*** Error at Run Time ***: Class Invariant Violation.
*** Error at Run Time ***: window /= Void


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