Re: [PATCH] rust: device: make lifetime on `Core` and `CoreInternal` invariant

[kernel test robot <lkp@intel.com>]

Hi Gary,

kernel test robot noticed the following build errors:

[auto build test ERROR on a13c140cc289c0b7b3770bce5b3ad42ab35074aa]

url:    https://github.com/intel-lab-lkp/linux/commits/Gary-Guo/rust-device-make-lifetime-on-Core-and-CoreInternal-invariant/20260714-041724
base:   a13c140cc289c0b7b3770bce5b3ad42ab35074aa
patch link:    https://lore.kernel.org/r/20260713201455.640151-1-gary%40kernel.org
patch subject: [PATCH] rust: device: make lifetime on `Core` and `CoreInternal` invariant
config: x86_64-buildonly-randconfig-002-20260714 (https://download.01.org/0day-ci/archive/20260714/202607142146.1EoHdPGy-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260714/202607142146.1EoHdPGy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607142146.1EoHdPGy-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0700]: hidden type for `impl pin_init::PinInit<RustDebugFs, kernel::error::Error> + 'a` captures lifetime that does not appear in bounds
   --> samples/rust/rust_debugfs.rs:154:9
   |
   150 |       fn new<'a>(pdev: &'a platform::Device<Core<'_>>) -> impl PinInit<Self, Error> + 'a {
   |                                             --------      ------------------------------ opaque type defined here
   |                                             |
>> |                                             hidden type `impl pin_init::PinInit<RustDebugFs, kernel::error::Error>` captures the anonymous lifetime defined here
   ...
   154 | /         try_pin_init! {
   155 | |             Self {
   156 | |                 _compatible <- debugfs.read_only_file(
   157 | |                     c"compatible",
   ...   |
   176 | |         }
   | |_________^
   |
   = note: this error originates in the macro `::pin_init::pin_init` which comes from the expansion of the macro `try_pin_init` (in Nightly builds, run with -Z macro-backtrace for more info)
   help: add a `use<...>` bound to explicitly capture `'_`
   |
   150 |     fn new<'a>(pdev: &'a platform::Device<Core<'_>>) -> impl PinInit<Self, Error> + 'a + use<'a, '_> {
   |                                                                                        +++++++++++++

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