error::QhError<'a>::into_static doctest fails

[LucaCiucci]

This was first observed in #10 checks failure. It is not clear to me why this did not happen before.

Possibly related issue: rust-lang/rfcs#2625

stderr:

thread 'main' panicked at core\src\panicking.rs:227:5:
panic in a function that cannot unwind
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\panicking.rs:665
   1: core::panicking::panic_nounwind_fmt::runtime
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/core\src\panicking.rs:115
   2: core::panicking::panic_nounwind_fmt
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/core\src\panicking.rs:125
   3: core::panicking::panic_nounwind
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/core\src\panicking.rs:227
   4: core::panicking::panic_cannot_unwind
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/core\src\panicking.rs:319
   5: qhull::error::impl$2::try_on_raw::cb<qhull::error::impl$2::try_on_raw::closure_env$0<tuple$<>,qhull::impl$0::compute::closure_env$0> >
             at .\src\error.rs:177
   6: _CxxFrameHandler3
   7: is_exception_typeof
   8: _C_specific_handler
   9: is_exception_typeof
  10: _CxxFrameHandler3
  11: _chkstk
  12: RtlUnwindEx
  13: RtlUnwind
  14: _report_gsfailure
  15: qh_errexit
             at .\qhull-sys\qhull\src\libqhull_r\user_r.c:282
  16: qh_maxsimplex
             at .\qhull-sys\qhull\src\libqhull_r\geom2_r.c:1285
  17: qh_initialvertices
             at .\qhull-sys\qhull\src\libqhull_r\poly2_r.c:2426
  18: qh_initbuild
             at .\qhull-sys\qhull\src\libqhull_r\poly2_r.c:2178
  19: qh_qhull
             at .\qhull-sys\qhull\src\libqhull_r\libqhull_r.c:67
  20: qhull::impl$0::compute::closure$0
             at .\src\lib.rs:43
  21: qhull::error::impl$2::try_on_raw::closure$0<tuple$<>,qhull::impl$0::compute::closure_env$0>
             at .\src\error.rs:205
  22: qhull::error::impl$2::try_on_raw::cb<qhull::error::impl$2::try_on_raw::closure_env$0<tuple$<>,qhull::impl$0::compute::closure_env$0> >
             at .\src\error.rs:191
  23: qhull_sys__try_on_qh
             at .\qhull-sys\src\error_handling.c:50
  24: qhull::error::QhError::try_on_raw<tuple$<>,qhull::impl$0::compute::closure_env$0>
             at .\src\error.rs:208
  25: qhull::Qh::try_on_qh<tuple$<>,qhull::impl$0::compute::closure_env$0>
             at .\src\lib.rs:162
  26: qhull::Qh::compute
             at .\src\lib.rs:43
  27: std::rt::lang_start
  28: std::rt::lang_start
  29: std::rt::lang_start
  30: std::rt::lang_start
  31: std::rt::lang_start
  32: std::rt::lang_start
  33: std::rt::lang_start_internal::closure$1
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\rt.rs:174
  34: std::panicking::try::do_call
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\panicking.rs:557
  35: std::panicking::try
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\panicking.rs:520
  36: std::panic::catch_unwind
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\panic.rs:358
  37: std::rt::lang_start_internal
             at /rustc/b3f75cc872cfd306860c3ad76a239e719015f855\library/std\src\rt.rs:174
  38: std::rt::lang_start
  39: main
  40: invoke_main
             at D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  41: __scrt_common_main_seh
             at D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
  42: BaseThreadInitThunk
  43: RtlUserThreadStart
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread caused non-unwinding panic. aborting.



failures:
    src\error.rs - error::QhError<'a>::into_static (line 92)