panic backtrace

gistfile1.txt

Breakpoint 1, 0x00007ffff7fa6858 in _Unwind_Backtrace () from /lib/x86_64-linux-gnu/libgcc_s.so.1
(gdb) bt
#0  0x00007ffff7fa6858 in _Unwind_Backtrace () from /lib/x86_64-linux-gnu/libgcc_s.so.1
#1  0x000055555557baf2 in std::backtrace_rs::backtrace::libunwind::trace () at library/std/src/../../backtrace/src/backtrace/libunwind.rs:117
#2  std::backtrace_rs::backtrace::trace_unsynchronized<std::sys::backtrace::_print_fmt::{closure_env#1}> () at library/std/src/../../backtrace/src/backtrace/mod.rs:66
#3  std::sys::backtrace::_print_fmt () at library/std/src/sys/backtrace.rs:66
#4  std::sys::backtrace::{impl#0}::print::{impl#0}::fmt () at library/std/src/sys/backtrace.rs:39
#5  0x0000555555596653 in core::fmt::rt::Argument::fmt () at library/core/src/fmt/rt.rs:173
#6  core::fmt::write () at library/core/src/fmt/mod.rs:1465
#7  0x0000555555579b63 in std::io::default_write_fmt<std::sys::stdio::unix::Stderr> () at library/std/src/io/mod.rs:639
#8  std::io::Write::write_fmt<std::sys::stdio::unix::Stderr> () at library/std/src/io/mod.rs:1954
#9  0x000055555557b942 in std::sys::backtrace::BacktraceLock::print () at library/std/src/sys/backtrace.rs:42
#10 0x000055555557c9a7 in std::panicking::default_hook::{closure#0} () at library/std/src/panicking.rs:297
#11 0x000055555557c7c9 in std::panicking::default_hook () at library/std/src/panicking.rs:327
#12 0x000055555557d352 in std::panicking::rust_panic_with_hook () at library/std/src/panicking.rs:833
#13 0x000055555557d22c in std::panicking::begin_panic::{closure#0}<&str> () at library/std/src/panicking.rs:770
#14 0x000055555557bfe9 in std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic::{closure_env#0}<&str>, !> () at library/std/src/sys/backtrace.rs:168
#15 0x000055555555e69d in std::panicking::begin_panic<&str> () at library/std/src/panicking.rs:769
#16 0x000055555555f8ea in panic_backtrace_snapshot_x86_64_linux::main () at tests/ui/panics/panic-backtrace-snapshot-x86_64-linux.rs:33
(gdb)