https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91997
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks, I can confirm that error. Oddly, it works fine when printing the
variable within its own stack frame:
$ gdb -q -ex "br printf" -ex r -ex up -ex bt -ex down -ex bt -ex cont -ex q
map
Reading symbols from map...
Breakpoint 1 at 0x401030
Starting program: /tmp/map
Breakpoint 1, __printf (format=0x403007 "%d\n") at printf.c:28
28 {
#1 0x0000000000401272 in foo (map=std::unordered_map with 1 element = {...})
at map.cc:16
16 __builtin_printf("%d\n", *it);
#0 __printf (format=0x403007 "%d\n") at printf.c:28
#1 0x0000000000401272 in foo (map=std::unordered_map with 1 element = {...})
at map.cc:16
#2 0x0000000000401203 in main () at map.cc:9
#0 __printf (format=0x403007 "%d\n") at printf.c:28
28 {
#0 __printf (format=0x403007 "%d\n") at printf.c:28
#1 0x0000000000401272 in foo (Python Exception <class 'gdb.error'> No type
named std::__detail::_Hash_node<struct std::pair<int const, int>, false>.:
map=std::unordered_map with 1 element) at map.cc:16
#2 0x0000000000401203 in main () at map.cc:9
Continuing.
42
[Inferior 1 (process 679052) exited normally]
It fails when it's not at the top of the stack.
