Implement AsBytes for endian types and Ipv* types

[declanvk]

          Going to hold off on endian types:

#[derive(Debug, Clone, Copy)]
#[cfg(feature = "nightly")]
struct BigEndian<T>
where
    [(); std::mem::size_of::<T>()]:,
{
    _repr_type: std::marker::PhantomData<T>,
    bytes: [u8; std::mem::size_of::<T>()],
}

Currently crashes my nightly compiler with:

declan@declan-MS-7C02:~/repos/github/declanvk/blart$ cargo +nightly build --features nightly
   Compiling blart v0.1.0 (/home/declan/repos/github/declanvk/blart)
warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
  --> src/lib.rs:11:9
   |
11 |         generic_const_exprs
   |         ^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: field `bytes` is never read
  --> src/key.rs:34:5
   |
29 | struct BigEndian<T>
   |        --------- field in this struct
...
34 |     bytes: [u8; std::mem::size_of::<T>()],
   |     ^^^^^
   |
   = note: `BigEndian` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
   = note: `#[warn(dead_code)]` on by default

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: cannot relate constants (Const { ty: fn() -> usize {std::mem::size_of::<T>}, kind: Value(Branch([])) }, Const { ty: fn() -> usize {std::mem::size_of::<_>}, kind: Value(Branch([])) }) of different types: fn() -> usize {std::mem::size_of::<T>} != fn() -> usize {std::mem::size_of::<_>}
  |
  = note: delayed at    0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &alloc::string::String>
             2: rustc_middle::ty::relate::super_relate_consts::<rustc_infer::infer::equate::Equate>
             3: <rustc_infer::infer::InferCtxt>::super_combine_consts::<rustc_infer::infer::equate::Equate>
             4: rustc_middle::ty::relate::super_relate_consts::<rustc_infer::infer::equate::Equate>
             5: <rustc_infer::infer::InferCtxt>::super_combine_consts::<rustc_infer::infer::equate::Equate>
             6: <rustc_infer::infer::InferCtxt>::commit_if_ok::<rustc_infer::infer::InferOk<()>, rustc_middle::ty::error::TypeError, <rustc_infer::infer::at::Trace>::eq<rustc_middle::ty::consts::Const>::{closure#0}>
             7: <rustc_infer::infer::at::At>::eq::<rustc_middle::ty::consts::Const>
             8: <rustc_trait_selection::traits::engine::ObligationCtxt>::eq::<rustc_middle::ty::consts::Const>
             9: <rustc_infer::infer::InferCtxt>::probe::<bool, <rustc_trait_selection::traits::const_evaluatable::satisfied_from_param_env::Visitor as rustc_middle::ty::visit::TypeVisitor>::visit_const::{closure#0}>
            10: <rustc_trait_selection::traits::const_evaluatable::satisfied_from_param_env::Visitor as rustc_middle::ty::visit::TypeVisitor>::visit_const
            11: rustc_trait_selection::traits::const_evaluatable::satisfied_from_param_env
            12: rustc_trait_selection::traits::const_evaluatable::is_const_evaluatable
            13: <rustc_trait_selection::traits::fulfill::FulfillProcessor as rustc_data_structures::obligation_forest::ObligationProcessor>::process_obligation
            14: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor>
            15: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_where_possible
            16: <rustc_hir_typeck::fn_ctxt::FnCtxt>::expected_inputs_for_expected_output
            17: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_struct_fields
            18: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
            19: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
            20: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
            21: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
            22: rustc_hir_typeck::check::check_fn
            23: rustc_hir_typeck::typeck
            24: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId, &rustc_middle::ty::typeck_results::TypeckResults>
            25: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck, rustc_query_impl::plumbing::QueryCtxt>
            26: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_hir_typeck::typeck_item_bodies::{closure#0}>::{closure#0}>
            27: rustc_hir_typeck::typeck_item_bodies
            28: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), ()>
            29: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
            30: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
            31: <rustc_session::session::Session>::time::<(), rustc_hir_analysis::check_crate::{closure#7}>
            32: rustc_hir_analysis::check_crate
            33: rustc_interface::passes::analysis
            34: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            35: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            36: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            37: <rustc_interface::passes::QueryContext>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            38: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
            39: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            40: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            41: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            42: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            43: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/alloc/src/boxed.rs:1988:9
            44: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/alloc/src/boxed.rs:1988:9
            45: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/std/src/sys/unix/thread.rs:108:17
            46: start_thread
                       at /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477:8
            47: clone
                       at /build/glibc-SzIz7B/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
          

error: internal compiler error: cannot relate constants (Const { ty: fn() -> usize {std::mem::size_of::<T>}, kind: Value(Branch([])) }, Const { ty: fn() -> usize {std::mem::size_of::<_>}, kind: Value(Branch([])) }) of different types: fn() -> usize {std::mem::size_of::<T>} != fn() -> usize {std::mem::size_of::<_>}
  |
  = note: delayed at    0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &alloc::string::String>
             2: rustc_middle::ty::relate::super_relate_consts::<rustc_infer::infer::equate::Equate>
             3: <rustc_infer::infer::InferCtxt>::super_combine_consts::<rustc_infer::infer::equate::Equate>
             4: rustc_middle::ty::relate::super_relate_consts::<rustc_infer::infer::equate::Equate>
             5: <rustc_infer::infer::InferCtxt>::super_combine_consts::<rustc_infer::infer::equate::Equate>
             6: <rustc_infer::infer::InferCtxt>::commit_if_ok::<rustc_infer::infer::InferOk<()>, rustc_middle::ty::error::TypeError, <rustc_infer::infer::at::Trace>::eq<rustc_middle::ty::consts::Const>::{closure#0}>
             7: <rustc_infer::infer::at::At>::eq::<rustc_middle::ty::consts::Const>
             8: <rustc_trait_selection::traits::engine::ObligationCtxt>::eq::<rustc_middle::ty::consts::Const>
             9: rustc_trait_selection::traits::const_evaluatable::satisfied_from_param_env
            10: rustc_trait_selection::traits::const_evaluatable::is_const_evaluatable
            11: <rustc_trait_selection::traits::fulfill::FulfillProcessor as rustc_data_structures::obligation_forest::ObligationProcessor>::process_obligation
            12: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor>
            13: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_where_possible
            14: <rustc_hir_typeck::fn_ctxt::FnCtxt>::expected_inputs_for_expected_output
            15: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_struct_fields
            16: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
            17: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
            18: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
            19: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
            20: rustc_hir_typeck::check::check_fn
            21: rustc_hir_typeck::typeck
            22: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId, &rustc_middle::ty::typeck_results::TypeckResults>
            23: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck, rustc_query_impl::plumbing::QueryCtxt>
            24: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_hir_typeck::typeck_item_bodies::{closure#0}>::{closure#0}>
            25: rustc_hir_typeck::typeck_item_bodies
            26: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), ()>
            27: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
            28: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
            29: <rustc_session::session::Session>::time::<(), rustc_hir_analysis::check_crate::{closure#7}>
            30: rustc_hir_analysis::check_crate
            31: rustc_interface::passes::analysis
            32: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            33: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
            34: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
            35: <rustc_interface::passes::QueryContext>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            36: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
            37: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            38: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            39: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
            40: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            41: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/alloc/src/boxed.rs:1988:9
            42: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/alloc/src/boxed.rs:1988:9
            43: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/8996ea93b6e554148c4286e62b613f12a3ee505c/library/std/src/sys/unix/thread.rs:108:17
            44: start_thread
                       at /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477:8
            45: clone
                       at /build/glibc-SzIz7B/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
          

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.69.0-nightly (8996ea93b 2023-02-09) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
warning: `blart` (lib) generated 2 warnings
error: could not compile `blart`; 2 warnings emitted

Originally posted by @declanvk in #16 (comment)