core: fix the docs of PanicInfo::location - #162062
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After `core::panic::PanicInfo` and `std::panic::PanicHookInfo` were split, the docs for `location` still showed incorrect usage of `std::panic::set_hook` for `core::panic::PanicInfo` location, leftover from before the split. Also notes for location methods of `PanicInfo` and `PanicHookInfo` were updated, explaining that if it is ever changed to return None, it should be addressed where the location is created and where it's unwrapped, to avoid unexpected behaviour when callers may expect to always receive location. For `PanicInfo`, `panic_fmt` builds it, and `panic_handler` unwraps it. For `PanicHookInfo`, `panic_with_hook` builds it, and `default_hook` unwraps it.
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After
core::panic::PanicInfoandstd::panic::PanicHookInfowere split, the docs forlocationstill showed incorrect usage ofstd::panic::set_hookforcore::panic::PanicInfolocation, leftover from before the split.Also notes for location methods of
PanicInfoandPanicHookInfowere updated, explaining that if it is ever changed to return None, it should be addressed where the location is created and where it's unwrapped, to avoid unexpected behavior when callers may expect to always receive location.PanicInfo,panic_fmtbuilds it, andpanic_handlerunwraps it.PanicHookInfo,panic_with_hookbuilds it, anddefault_hookunwraps it.Addresses: #128788
@rustbot label +A-docs
r? libs