bors e4417cf020 Auto merge of #92268 - jswrenn:transmute, r=oli-obk ... Initial implementation of transmutability trait. *T'was the night before Christmas and all through the codebase, not a miri was stirring — no hint of `unsafe`!* This PR provides an initial, **incomplete** implementation of *[MCP 411: Lang Item for Transmutability](https://github.com/rust-lang/compiler-team/issues/411)*. The `core::mem::BikeshedIntrinsicFrom` trait provided by this PR is implemented on-the-fly by the compiler for types `Src` and `Dst` when the bits of all possible values of type `Src` are safely reinterpretable as a value of type `Dst`. What this PR provides is: - [x] [support for transmutations involving primitives](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/primitives) - [x] [support for transmutations involving arrays](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/arrays) - [x] [support for transmutations involving structs](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/structs) - [x] [support for transmutations involving enums](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/enums) - [x] [support for transmutations involving unions](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/unions) - [x] [support for weaker validity checks](https://github.com/jswrenn/rust/blob/transmute/src/test/ui/transmutability/unions/should_permit_intersecting_if_validity_is_assumed.rs) (i.e., `Assume::VALIDITY`) - [x] visibility checking What isn't yet implemented: - [ ] transmutability options passed using the `Assume` struct - [ ] [support for references](https://github.com/jswrenn/rust/blob/transmute/src/test/ui/transmutability/references.rs) - [ ] smarter error messages These features will be implemented in future PRs.		2022-08-02 21:17:31 +00:00
..
rustc
rustc_apfloat
rustc_arena
rustc_ast	Auto merge of #100024 - matthiaskrgr:rollup-36ab4wx, r=matthiaskrgr	2022-08-01 15:40:43 +00:00
rustc_ast_lowering	Store associated item defaultness in impl_defaultness.	2022-08-01 21:38:16 +02:00
rustc_ast_passes
rustc_ast_pretty
rustc_attr
rustc_borrowck	Improve cannot move out of error message	2022-07-31 21:06:43 +03:00
rustc_builtin_macros	Rollup merge of #100045 - Amanieu:global_asm_may_unwind, r=tmiasko	2022-08-02 17:17:34 +02:00
rustc_codegen_cranelift
rustc_codegen_gcc
rustc_codegen_llvm
rustc_codegen_ssa	Auto merge of #99944 - bjorn3:hide_proc_macro_symbols, r=eddyb	2022-08-01 03:58:52 +00:00
rustc_const_eval	Remove trait_of_item query.	2022-08-01 21:39:26 +02:00
rustc_data_structures
rustc_driver
rustc_error_codes
rustc_error_messages
rustc_errors
rustc_expand
rustc_feature
rustc_fs_util
rustc_graphviz
rustc_hir	Auto merge of #92268 - jswrenn:transmute, r=oli-obk	2022-08-02 21:17:31 +00:00
rustc_hir_pretty
rustc_incremental	Remove trait_of_item query.	2022-08-01 21:39:26 +02:00
rustc_index	Auto merge of #99052 - tmiasko:bitset-clone-from, r=Mark-Simulacrum	2022-07-31 21:40:21 +00:00
rustc_infer	Auto merge of #100032 - BoxyUwU:no_ty_in_placeholder_const, r=compiler-errors	2022-08-02 13:10:49 +00:00
rustc_interface	Rollup merge of #99519 - Urgau:check-cfg-implicit, r=petrochenkov	2022-07-31 23:39:38 +02:00
rustc_lexer	Shrink Token.	2022-08-01 08:53:04 +10:00
rustc_lint	Remove DefId from AssocItemContainer.	2022-08-01 21:38:45 +02:00
rustc_lint_defs
rustc_llvm
rustc_log
rustc_macros
rustc_metadata	Auto merge of #95884 - cjgillot:assoc-item, r=lcnr	2022-08-01 21:43:35 +00:00
rustc_middle	Auto merge of #92268 - jswrenn:transmute, r=oli-obk	2022-08-02 21:17:31 +00:00
rustc_mir_build	Remove trait_of_item query.	2022-08-01 21:39:26 +02:00
rustc_mir_dataflow	Remove redundant TransferWrapper struct	2022-08-01 17:08:19 +02:00
rustc_mir_transform
rustc_monomorphize
rustc_parse	Rollup merge of #100011 - compiler-errors:let-chain-restriction, r=fee1-dead	2022-08-02 07:30:44 +02:00
rustc_parse_format
rustc_passes	Remove trait_of_item query.	2022-08-01 21:39:26 +02:00
rustc_plugin_impl
rustc_privacy	Remove DefId from AssocItemContainer.	2022-08-01 21:38:45 +02:00
rustc_query_impl
rustc_query_system
rustc_resolve
rustc_save_analysis	Remove DefId from AssocItemContainer.	2022-08-01 21:38:45 +02:00
rustc_serialize
rustc_session	Rollup merge of #99620 - hudson-ayers:fix-location-detail, r=davidtwco	2022-07-31 23:39:40 +02:00
rustc_smir
rustc_span	Auto merge of #92268 - jswrenn:transmute, r=oli-obk	2022-08-02 21:17:31 +00:00
rustc_symbol_mangling
rustc_target	Auto merge of #92268 - jswrenn:transmute, r=oli-obk	2022-08-02 21:17:31 +00:00
rustc_trait_selection	Auto merge of #92268 - jswrenn:transmute, r=oli-obk	2022-08-02 21:17:31 +00:00
rustc_traits	Auto merge of #100032 - BoxyUwU:no_ty_in_placeholder_const, r=compiler-errors	2022-08-02 13:10:49 +00:00
rustc_transmute	safe transmute: fix broken intradoc link	2022-08-02 14:44:23 +00:00
rustc_ty_utils	Remove trait_of_item query.	2022-08-01 21:39:26 +02:00
rustc_type_ir
rustc_typeck	remove a SourceMap::guess_head_span	2022-08-02 11:40:23 +09:00