Bug#961335: rust-ppv-lite86 FTBFS on s390x: test failure

Source: rust-ppv-lite86
Version: 0.2.6-1
Severity: serious
Tags: ftbfs

https://buildd.debian.org/status/fetch.php?pkg=rust-ppv-lite86&arch=s390x&ver=0.2.6-1&stamp=1588594475&raw=0

...
test generic::test_rotate_u128 ... FAILED

failures:

---- generic::test_rotate_u128 stdout ----
thread 'generic::test_rotate_u128' panicked at 'assertion failed: `(left == right)`
  left: `179484721697328043195977855955129173510`,
 right: `4008555064381989435031833130221962502`', src/generic.rs:329:5
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /usr/src/rustc-1.42.0/vendor/backtrace/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /usr/src/rustc-1.42.0/vendor/backtrace/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:77
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1052
   5: std::io::Write::write_fmt
             at /usr/src/rustc-1.42.0/src/libstd/io/mod.rs:1426
   6: std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt
             at src/libstd/io/impls.rs:156
   7: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   8: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   9: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:204
  10: std::panicking::default_hook
             at src/libstd/panicking.rs:221
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:472
  12: rust_begin_unwind
             at src/libstd/panicking.rs:380
  13: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  14: ppv_lite86::generic::test_rotate_u128
             at src/generic.rs:329
  15: ppv_lite86::generic::test_rotate_u128::{{closure}}
             at src/generic.rs:327
  16: core::ops::function::FnOnce::call_once
             at /usr/src/rustc-1.42.0/src/libcore/ops/function.rs:232
  17: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
             at /usr/src/rustc-1.42.0/src/liballoc/boxed.rs:1015
  18: __rust_try
  19: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:86
  20: std::panicking::try
             at /usr/src/rustc-1.42.0/src/libstd/panicking.rs:281
  21: std::panic::catch_unwind
             at /usr/src/rustc-1.42.0/src/libstd/panic.rs:394
  22: test::run_test_in_process
             at src/libtest/lib.rs:539
  23: test::run_test::run_test_inner::{{closure}}
             at src/libtest/lib.rs:452
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.


failures:
    generic::test_rotate_u128

test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out

error: test failed, to rerun pass '--lib'
dh_auto_test: error: /usr/share/cargo/bin/cargo test --all returned exit code 101
make[1]: *** [debian/rules:6: override_dh_auto_test] Error 25


debian-s390 is Cc'ed.