Nicholas Nethercote 94f08492af Improve comments about type folding/visiting. ... I have found this code confusing for years. I've always roughly understood it, but never exactly. I just made my fourth(?) attempt and finally cracked it. This commit improves the comments. In particular, it explicitly describes how you can't do a custom fold/visit of any type; there are actually a handful of "types of interest" (e.g. `Ty`, `Predicate`, `Region`, `Const`) that can be custom folded/visted, and all other types just get a generic traversal. I think this was the part that eluded me on all my prior attempts at understanding. The commit also updates comments to account for some newer changes such as the fallible/infallible folding distinction, does some minor reorderings, and moves one `impl` to a better place.		2022-02-17 23:15:40 +11:00
..
rustc	remove unused jemallocator crate	2022-01-28 16:56:05 +01:00
rustc_apfloat	Stabilize iter::zip.	2021-12-14 18:50:31 -04:00
rustc_arena	Remove unused dep from rustc_arena	2022-02-02 17:37:14 +01:00
rustc_ast	Auto merge of #93752 - eholk:drop-tracking-break-continue, r=nikomatsakis	2022-02-15 02:27:37 +00:00
rustc_ast_lowering	Auto merge of #91403 - cjgillot:inherit-async, r=oli-obk	2022-02-12 21:42:10 +00:00
rustc_ast_passes	Auto merge of #93561 - Amanieu:more-unwind-abi, r=nagisa	2022-02-08 03:20:05 +00:00
rustc_ast_pretty	Pretty print ItemKind::Use in rustfmt style	2022-02-07 21:51:05 -08:00
rustc_attr	Ensure that queries only return Copy types.	2022-02-09 20:07:38 +01:00
rustc_borrowck	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_builtin_macros	Remove the alt_std_name option	2022-02-11 20:28:38 +01:00
rustc_codegen_cranelift	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_codegen_gcc	Unconditionally update symbols	2022-02-10 18:27:18 +01:00
rustc_codegen_llvm	Rollup merge of #94001 - durin42:llvm-15-uwtable, r=nikic	2022-02-15 16:02:37 +01:00
rustc_codegen_ssa	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_const_eval	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_data_structures	Address review comments.	2022-02-15 16:20:01 +11:00
rustc_driver	Remove Config::stderr	2022-02-13 11:49:52 +01:00
rustc_error_codes	Auto merge of #91403 - cjgillot:inherit-async, r=oli-obk	2022-02-12 21:42:10 +00:00
rustc_errors	add a rustc::query_stability lint	2022-02-01 10:15:59 +01:00
rustc_expand	add a rustc::query_stability lint	2022-02-01 10:15:59 +01:00
rustc_feature	Update unsafe_pin_internals unstable version.	2022-02-14 19:17:21 +00:00
rustc_fs_util	Migrate to 2021	2021-09-20 22:21:42 -04:00
rustc_graphviz	eplace usages of vec![].into_iter with [].into_iter	2022-01-09 14:09:25 +11:00
rustc_hir	Auto merge of #93938 - BoxyUwU:fix_res_self_ty, r=lcnr	2022-02-14 12:26:43 +00:00
rustc_hir_pretty	Rollup merge of #93746 - cjgillot:nodefii, r=nikomatsakis	2022-02-09 14:12:22 +09:00
rustc_incremental	add a rustc::query_stability lint	2022-02-01 10:15:59 +01:00
rustc_index	implement lint for suspicious auto trait impls	2022-02-01 09:55:19 +01:00
rustc_infer	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_interface	Remove Config::stderr	2022-02-13 11:49:52 +01:00
rustc_lexer	Auto merge of #91393 - Julian-Wollersberger:lexer_optimization, r=petrochenkov	2021-12-03 13:20:14 +00:00
rustc_lint	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_lint_defs	implement lint for suspicious auto trait impls	2022-02-01 09:55:19 +01:00
rustc_llvm	llvm: migrate to new parameter-bearing uwtable attr	2022-02-14 16:09:53 -05:00
rustc_log	Make rustc_log doc test runnable	2022-01-03 22:31:56 -08:00
rustc_macros	Make Decodable and Decoder infallible.	2022-01-22 10:38:31 +11:00
rustc_metadata	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_middle	Improve comments about type folding/visiting.	2022-02-17 23:15:40 +11:00
rustc_mir_build	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_mir_dataflow	Overhaul TyS and Ty.	2022-02-15 16:03:24 +11:00
rustc_mir_transform	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_monomorphize	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_parse	suggest using raw string literals when invalid escapes appear	2022-02-14 15:11:38 -05:00
rustc_parse_format	Migrate to 2021	2021-09-20 22:21:42 -04:00
rustc_passes	change to a struct variant	2022-02-12 11:23:53 +00:00
rustc_plugin_impl	replace dynamic library module with libloading	2021-12-06 12:03:47 -05:00
rustc_privacy	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_query_impl	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_query_system	Revert "Auto merge of #92007 - oli-obk:lazy_tait2, r=nikomatsakis"	2022-02-11 07:18:06 +00:00
rustc_resolve	Rename PtrKey as Interned and improve it.	2022-02-15 15:50:29 +11:00
rustc_save_analysis	change to a struct variant	2022-02-12 11:23:53 +00:00
rustc_serialize	Drop json::from_reader	2022-02-05 15:07:10 -05:00
rustc_session	Remove the alt_std_name option	2022-02-11 20:28:38 +01:00
rustc_span	Auto merge of #93176 - danielhenrymantilla:stack-pinning-macro, r=m-ou-se	2022-02-15 09:32:03 +00:00
rustc_symbol_mangling	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_target	rustc_target: Remove compiler-rt linking hack on Android	2022-02-13 21:22:02 +08:00
rustc_trait_selection	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_traits	Overhaul Const.	2022-02-15 16:19:59 +11:00
rustc_ty_utils	Overhaul RegionKind and Region.	2022-02-15 16:08:52 +11:00
rustc_type_ir	Revert "Auto merge of #92007 - oli-obk:lazy_tait2, r=nikomatsakis"	2022-02-11 07:18:06 +00:00
rustc_typeck	Add removed comments back in self-outlives-lint	2022-02-15 09:17:09 -08:00