Rollup merge of #40786 - frewsxcv:unstable-book-remaining-features, r=steveklabnik

Add all unstable features to Unstable Book.

Add all unstable features to the Unstable Book, also remove a few that
either no longer exist or were promoted to stable.

These changes were extracted out of
https://github.com/rust-lang/rust/pull/40694

122 files changed, 876 insertions, 22 deletions

diff --git a/src/doc/unstable-book/src/SUMMARY.md b/src/doc/unstable-book/src/SUMMARY.md
index 456c76d43a6..fe491d7f901 100644
--- a/src/doc/unstable-book/src/SUMMARY.md
+++ b/src/doc/unstable-book/src/SUMMARY.md
@@ -7,90 +7,207 @@
 - [abi_vectorcall](abi-vectorcall.md)
 - [abi_x86_interrupt](abi-x86-interrupt.md)
 - [advanced_slice_patterns](advanced-slice-patterns.md)
+- [alloc](alloc.md)
 - [alloc_jemalloc](alloc-jemalloc.md)
 - [alloc_system](alloc-system.md)
 - [allocator](allocator.md)
 - [allow_internal_unstable](allow-internal-unstable.md)
+- [as_unsafe_cell](as-unsafe-cell.md)
+- [ascii_ctype](ascii-ctype.md)
 - [asm](asm.md)
 - [associated_consts](associated-consts.md)
 - [associated_type_defaults](associated-type-defaults.md)
 - [attr_literals](attr-literals.md)
+- [binary_heap_extras](binary-heap-extras.md)
+- [binary_heap_peek_mut_pop](binary-heap-peek-mut-pop.md)
+- [borrow_state](borrow-state.md)
+- [box_heap](box-heap.md)
 - [box_patterns](box-patterns.md)
 - [box_syntax](box-syntax.md)
+- [c_void_variant](c-void-variant.md)
+- [catch_expr](catch-expr.md)
 - [cfg_target_feature](cfg-target-feature.md)
 - [cfg_target_has_atomic](cfg-target-has-atomic.md)
 - [cfg_target_thread_local](cfg-target-thread-local.md)
 - [cfg_target_vendor](cfg-target-vendor.md)
+- [char_escape_debug](char-escape-debug.md)
+- [closure_to_fn_coercion](closure-to-fn-coercion.md)
+- [coerce_unsized](coerce-unsized.md)
+- [collection_placement](collection-placement.md)
+- [collections](collections.md)
+- [collections_range](collections-range.md)
+- [command_envs](command-envs.md)
 - [compiler_builtins](compiler-builtins.md)
+- [compiler_builtins_lib](compiler-builtins-lib.md)
 - [concat_idents](concat-idents.md)
+- [concat_idents_macro](concat-idents-macro.md)
 - [conservative_impl_trait](conservative-impl-trait.md)
 - [const_fn](const-fn.md)
 - [const_indexing](const-indexing.md)
+- [core_char_ext](core-char-ext.md)
+- [core_float](core-float.md)
+- [core_intrinsics](core-intrinsics.md)
+- [core_panic](core-panic.md)
+- [core_private_bignum](core-private-bignum.md)
+- [core_private_diy_float](core-private-diy-float.md)
+- [core_slice_ext](core-slice-ext.md)
+- [core_str_ext](core-str-ext.md)
 - [custom_attribute](custom-attribute.md)
 - [custom_derive](custom-derive.md)
+- [dec2flt](dec2flt.md)
+- [decode_utf8](decode-utf8.md)
 - [default_type_parameter_fallback](default-type-parameter-fallback.md)
+- [derive_clone_copy](derive-clone-copy.md)
+- [derive_eq](derive-eq.md)
+- [discriminant_value](discriminant-value.md)
 - [drop_types_in_const](drop-types-in-const.md)
 - [dropck_eyepatch](dropck-eyepatch.md)
 - [dropck_parametricity](dropck-parametricity.md)
+- [enumset](enumset.md)
+- [error_type_id](error-type-id.md)
+- [exact_size_is_empty](exact-size-is-empty.md)
 - [exclusive_range_pattern](exclusive-range-pattern.md)
-- [field_init_shorthand](field-init-shorthand.md)
+- [fd](fd.md)
+- [fd_read](fd-read.md)
+- [fixed_size_array](fixed-size-array.md)
+- [float_extras](float-extras.md)
+- [flt2dec](flt2dec.md)
+- [fmt_flags_align](fmt-flags-align.md)
+- [fmt_internals](fmt-internals.md)
+- [fn_traits](fn-traits.md)
+- [fnbox](fnbox.md)
 - [fundamental](fundamental.md)
+- [fused](fused.md)
+- [future_atomic_orderings](future-atomic-orderings.md)
 - [generic_param_attrs](generic-param-attrs.md)
+- [get_type_id](get-type-id.md)
+- [heap_api](heap-api.md)
+- [i128](i128.md)
 - [i128_type](i128-type.md)
+- [inclusive_range](inclusive-range.md)
 - [inclusive_range_syntax](inclusive-range-syntax.md)
+- [int_error_internals](int-error-internals.md)
+- [integer_atomics](integer-atomics.md)
+- [into_boxed_c_str](into-boxed-c-str.md)
+- [into_boxed_os_str](into-boxed-os-str.md)
+- [into_boxed_path](into-boxed-path.md)
 - [intrinsics](intrinsics.md)
+- [io](io.md)
+- [io_error_internals](io-error-internals.md)
+- [ip](ip.md)
+- [is_unique](is-unique.md)
+- [iter_rfind](iter-rfind.md)
 - [lang_items](lang-items.md)
+- [libstd_io_internals](libstd-io-internals.md)
+- [libstd_sys_internals](libstd-sys-internals.md)
+- [libstd_thread_internals](libstd-thread-internals.md)
 - [link_args](link-args.md)
 - [link_cfg](link-cfg.md)
 - [link_llvm_intrinsics](link-llvm-intrinsics.md)
 - [linkage](linkage.md)
+- [linked_list_extras](linked-list-extras.md)
 - [log_syntax](log-syntax.md)
+- [lookup_host](lookup-host.md)
 - [loop_break_value](loop-break-value.md)
 - [macro_reexport](macro-reexport.md)
 - [main](main.md)
+- [map_entry_recover_keys](map-entry-recover-keys.md)
+- [mpsc_select](mpsc-select.md)
+- [n16](n16.md)
 - [naked_functions](naked-functions.md)
 - [needs_allocator](needs-allocator.md)
 - [needs_panic_runtime](needs-panic-runtime.md)
 - [never_type](never-type.md)
+- [never_type_impls](never-type-impls.md)
 - [no_core](no-core.md)
 - [no_debug](no-debug.md)
 - [non_ascii_idents](non-ascii-idents.md)
+- [nonzero](nonzero.md)
 - [omit_gdb_pretty_printer_section](omit-gdb-pretty-printer-section.md)
 - [on_unimplemented](on-unimplemented.md)
+- [once_poison](once-poison.md)
+- [oom](oom.md)
 - [optin_builtin_traits](optin-builtin-traits.md)
+- [option_entry](option-entry.md)
+- [osstring_shrink_to_fit](osstring-shrink-to-fit.md)
+- [panic_abort](panic-abort.md)
 - [panic_runtime](panic-runtime.md)
+- [panic_unwind](panic-unwind.md)
+- [pattern](pattern.md)
+- [peek](peek.md)
+- [placement_in](placement-in.md)
 - [placement_in_syntax](placement-in-syntax.md)
+- [placement_new_protocol](placement-new-protocol.md)
 - [platform_intrinsics](platform-intrinsics.md)
 - [plugin](plugin.md)
 - [plugin_registrar](plugin-registrar.md)
 - [prelude_import](prelude-import.md)
+- [print](print.md)
 - [proc_macro](proc-macro.md)
+- [proc_macro_internals](proc-macro-internals.md)
+- [process_try_wait](process-try-wait.md)
+- [pub_restricted](pub-restricted.md)
+- [question_mark_carrier](question-mark-carrier.md)
 - [quote](quote.md)
+- [rand](rand.md)
+- [range_contains](range-contains.md)
+- [raw](raw.md)
+- [rc_would_unwrap](rc-would-unwrap.md)
 - [relaxed_adts](relaxed-adts.md)
 - [repr_simd](repr-simd.md)
+- [retain_hash_collection](retain-hash-collection.md)
+- [rt](rt.md)
 - [rustc_attrs](rustc-attrs.md)
 - [rustc_diagnostic_macros](rustc-diagnostic-macros.md)
+- [rustc_private](rustc-private.md)
+- [rustdoc](rustdoc.md)
 - [rvalue_static_promotion](rvalue-static-promotion.md)
 - [sanitizer_runtime](sanitizer-runtime.md)
+- [sanitizer_runtime_lib](sanitizer-runtime-lib.md)
+- [set_stdio](set-stdio.md)
+- [shared](shared.md)
 - [simd](simd.md)
 - [simd_ffi](simd-ffi.md)
+- [sip_hash_13](sip-hash-13.md)
+- [slice_concat_ext](slice-concat-ext.md)
+- [slice_get_slice](slice-get-slice.md)
 - [slice_patterns](slice-patterns.md)
+- [sort_internals](sort-internals.md)
 - [sort_unstable](sort-unstable.md)
 - [specialization](specialization.md)
 - [staged_api](staged-api.md)
 - [start](start.md)
 - [static_nobundle](static-nobundle.md)
-- [static_recursion](static-recursion.md)
+- [step_by](step-by.md)
+- [step_trait](step-trait.md)
 - [stmt_expr_attributes](stmt-expr-attributes.md)
+- [str_escape](str-escape.md)
+- [str_internals](str-internals.md)
 - [struct_field_attributes](struct-field-attributes.md)
 - [structural_match](structural-match.md)
 - [target_feature](target-feature.md)
 - [test](test.md)
+- [thread_id](thread-id.md)
 - [thread_local](thread-local.md)
+- [thread_local_internals](thread-local-internals.md)
+- [thread_local_state](thread-local-state.md)
 - [trace_macros](trace-macros.md)
+- [trusted_len](trusted-len.md)
+- [try_from](try-from.md)
 - [type_ascription](type-ascription.md)
 - [unboxed_closures](unboxed-closures.md)
+- [unicode](unicode.md)
+- [unique](unique.md)
+- [unsize](unsize.md)
 - [untagged_unions](untagged-unions.md)
 - [unwind_attributes](unwind-attributes.md)
+- [update_panic_count](update-panic-count.md)
 - [use_extern_macros](use-extern-macros.md)
+- [utf8_error_error_len](utf8-error-error-len.md)
+- [vec_remove_item](vec-remove-item.md)
+- [windows_c](windows-c.md)
+- [windows_handle](windows-handle.md)
+- [windows_net](windows-net.md)
+- [windows_stdio](windows-stdio.md)
 - [windows_subsystem](windows-subsystem.md)
+- [zero_one](zero-one.md)
diff --git a/src/doc/unstable-book/src/alloc.md b/src/doc/unstable-book/src/alloc.md
new file mode 100644
index 00000000000..47eeb0874fb
--- /dev/null
+++ b/src/doc/unstable-book/src/alloc.md
@@ -0,0 +1,7 @@
+# `alloc`
+
+The tracking issue for this feature is: [#27783]
+
+[#27783]: https://github.com/rust-lang/rust/issues/27783
+
+------------------------
diff --git a/src/doc/unstable-book/src/as-unsafe-cell.md b/src/doc/unstable-book/src/as-unsafe-cell.md
new file mode 100644
index 00000000000..79d7a7cad0b
--- /dev/null
+++ b/src/doc/unstable-book/src/as-unsafe-cell.md
@@ -0,0 +1,7 @@
+# `as_unsafe_cell`
+
+The tracking issue for this feature is: [#27708]
+
+[#27708]: https://github.com/rust-lang/rust/issues/27708
+
+------------------------
diff --git a/src/doc/unstable-book/src/ascii-ctype.md b/src/doc/unstable-book/src/ascii-ctype.md
new file mode 100644
index 00000000000..e253b4dcd9b
--- /dev/null
+++ b/src/doc/unstable-book/src/ascii-ctype.md
@@ -0,0 +1,5 @@
+# `ascii_ctype`
+
+The tracking issue for this feature is: [#39658]
+
+[#39658]: https://github.com/rust-lang/rust/issues/39658
diff --git a/src/doc/unstable-book/src/binary-heap-extras.md b/src/doc/unstable-book/src/binary-heap-extras.md
new file mode 100644
index 00000000000..aa535f3b678
--- /dev/null
+++ b/src/doc/unstable-book/src/binary-heap-extras.md
@@ -0,0 +1,7 @@
+# `binary_heap_extras`
+
+The tracking issue for this feature is: [#28147]
+
+[#28147]: https://github.com/rust-lang/rust/issues/28147
+
+------------------------
diff --git a/src/doc/unstable-book/src/binary-heap-peek-mut-pop.md b/src/doc/unstable-book/src/binary-heap-peek-mut-pop.md
new file mode 100644
index 00000000000..f3863ab2a2a
--- /dev/null
+++ b/src/doc/unstable-book/src/binary-heap-peek-mut-pop.md
@@ -0,0 +1,7 @@
+# `binary_heap_peek_mut_pop`
+
+The tracking issue for this feature is: [#38863]
+
+[#38863]: https://github.com/rust-lang/rust/issues/38863
+
+------------------------
diff --git a/src/doc/unstable-book/src/borrow-state.md b/src/doc/unstable-book/src/borrow-state.md
new file mode 100644
index 00000000000..304b8dffe98
--- /dev/null
+++ b/src/doc/unstable-book/src/borrow-state.md
@@ -0,0 +1,7 @@
+# `borrow_state`
+
+The tracking issue for this feature is: [#27733]
+
+[#27733]: https://github.com/rust-lang/rust/issues/27733
+
+------------------------
diff --git a/src/doc/unstable-book/src/box-heap.md b/src/doc/unstable-book/src/box-heap.md
new file mode 100644
index 00000000000..0f3f01ba0e1
--- /dev/null
+++ b/src/doc/unstable-book/src/box-heap.md
@@ -0,0 +1,7 @@
+# `box_heap`
+
+The tracking issue for this feature is: [#27779]
+
+[#27779]: https://github.com/rust-lang/rust/issues/27779
+
+------------------------
diff --git a/src/doc/unstable-book/src/c-void-variant.md b/src/doc/unstable-book/src/c-void-variant.md
new file mode 100644
index 00000000000..a2fdc993630
--- /dev/null
+++ b/src/doc/unstable-book/src/c-void-variant.md
@@ -0,0 +1,5 @@
+# `c_void_variant`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/catch-expr.md b/src/doc/unstable-book/src/catch-expr.md
new file mode 100644
index 00000000000..44eb2a6dd4f
--- /dev/null
+++ b/src/doc/unstable-book/src/catch-expr.md
@@ -0,0 +1,7 @@
+# `catch_expr`
+
+The tracking issue for this feature is: [#31436]
+
+[#31436]: https://github.com/rust-lang/rust/issues/31436
+
+------------------------
diff --git a/src/doc/unstable-book/src/char-escape-debug.md b/src/doc/unstable-book/src/char-escape-debug.md
new file mode 100644
index 00000000000..21aa486219e
--- /dev/null
+++ b/src/doc/unstable-book/src/char-escape-debug.md
@@ -0,0 +1,7 @@
+# `char_escape_debug`
+
+The tracking issue for this feature is: [#35068]
+
+[#35068]: https://github.com/rust-lang/rust/issues/35068
+
+------------------------
diff --git a/src/doc/unstable-book/src/closure-to-fn-coercion.md b/src/doc/unstable-book/src/closure-to-fn-coercion.md
new file mode 100644
index 00000000000..4e3b735e24f
--- /dev/null
+++ b/src/doc/unstable-book/src/closure-to-fn-coercion.md
@@ -0,0 +1,7 @@
+# `closure_to_fn_coercion`
+
+The tracking issue for this feature is: [#39817]
+
+[#39817]: https://github.com/rust-lang/rust/issues/39817
+
+------------------------
diff --git a/src/doc/unstable-book/src/coerce-unsized.md b/src/doc/unstable-book/src/coerce-unsized.md
new file mode 100644
index 00000000000..078d3faf42a
--- /dev/null
+++ b/src/doc/unstable-book/src/coerce-unsized.md
@@ -0,0 +1,7 @@
+# `coerce_unsized`
+
+The tracking issue for this feature is: [#27732]
+
+[#27732]: https://github.com/rust-lang/rust/issues/27732
+
+------------------------
diff --git a/src/doc/unstable-book/src/collection-placement.md b/src/doc/unstable-book/src/collection-placement.md
new file mode 100644
index 00000000000..268ca6ea590
--- /dev/null
+++ b/src/doc/unstable-book/src/collection-placement.md
@@ -0,0 +1,7 @@
+# `collection_placement`
+
+The tracking issue for this feature is: [#30172]
+
+[#30172]: https://github.com/rust-lang/rust/issues/30172
+
+------------------------
diff --git a/src/doc/unstable-book/src/collections-range.md b/src/doc/unstable-book/src/collections-range.md
new file mode 100644
index 00000000000..ea4f999ba0f
--- /dev/null
+++ b/src/doc/unstable-book/src/collections-range.md
@@ -0,0 +1,7 @@
+# `collections_range`
+
+The tracking issue for this feature is: [#30877]
+
+[#30877]: https://github.com/rust-lang/rust/issues/30877
+
+------------------------
diff --git a/src/doc/unstable-book/src/collections.md b/src/doc/unstable-book/src/collections.md
new file mode 100644
index 00000000000..5c937833c9e
--- /dev/null
+++ b/src/doc/unstable-book/src/collections.md
@@ -0,0 +1,5 @@
+# `collections`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/command-envs.md b/src/doc/unstable-book/src/command-envs.md
new file mode 100644
index 00000000000..0ab89e278cd
--- /dev/null
+++ b/src/doc/unstable-book/src/command-envs.md
@@ -0,0 +1,7 @@
+# `command_envs`
+
+The tracking issue for this feature is: [#38526]
+
+[#38526]: https://github.com/rust-lang/rust/issues/38526
+
+------------------------
diff --git a/src/doc/unstable-book/src/compiler-builtins-lib.md b/src/doc/unstable-book/src/compiler-builtins-lib.md
new file mode 100644
index 00000000000..8986b968ca6
--- /dev/null
+++ b/src/doc/unstable-book/src/compiler-builtins-lib.md
@@ -0,0 +1,5 @@
+# `compiler_builtins_lib`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/concat-idents-macro.md b/src/doc/unstable-book/src/concat-idents-macro.md
new file mode 100644
index 00000000000..ac2fdd4fceb
--- /dev/null
+++ b/src/doc/unstable-book/src/concat-idents-macro.md
@@ -0,0 +1,7 @@
+# `concat_idents_macro`
+
+The tracking issue for this feature is: [#29599]
+
+[#29599]: https://github.com/rust-lang/rust/issues/29599
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-char-ext.md b/src/doc/unstable-book/src/core-char-ext.md
new file mode 100644
index 00000000000..d37d6b5c6d0
--- /dev/null
+++ b/src/doc/unstable-book/src/core-char-ext.md
@@ -0,0 +1,7 @@
+# `core_char_ext`
+
+The tracking issue for this feature is: [#32110]
+
+[#32110]: https://github.com/rust-lang/rust/issues/32110
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-float.md b/src/doc/unstable-book/src/core-float.md
new file mode 100644
index 00000000000..194b2608dd0
--- /dev/null
+++ b/src/doc/unstable-book/src/core-float.md
@@ -0,0 +1,7 @@
+# `core_float`
+
+The tracking issue for this feature is: [#32110]
+
+[#32110]: https://github.com/rust-lang/rust/issues/32110
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-intrinsics.md b/src/doc/unstable-book/src/core-intrinsics.md
new file mode 100644
index 00000000000..28ad3525ef7
--- /dev/null
+++ b/src/doc/unstable-book/src/core-intrinsics.md
@@ -0,0 +1,5 @@
+# `core_intrinsics`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-panic.md b/src/doc/unstable-book/src/core-panic.md
new file mode 100644
index 00000000000..c197588404c
--- /dev/null
+++ b/src/doc/unstable-book/src/core-panic.md
@@ -0,0 +1,5 @@
+# `core_panic`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-private-bignum.md b/src/doc/unstable-book/src/core-private-bignum.md
new file mode 100644
index 00000000000..f85811c545e
--- /dev/null
+++ b/src/doc/unstable-book/src/core-private-bignum.md
@@ -0,0 +1,5 @@
+# `core_private_bignum`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-private-diy-float.md b/src/doc/unstable-book/src/core-private-diy-float.md
new file mode 100644
index 00000000000..8465921d673
--- /dev/null
+++ b/src/doc/unstable-book/src/core-private-diy-float.md
@@ -0,0 +1,5 @@
+# `core_private_diy_float`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-slice-ext.md b/src/doc/unstable-book/src/core-slice-ext.md
new file mode 100644
index 00000000000..c50d44ac0ce
--- /dev/null
+++ b/src/doc/unstable-book/src/core-slice-ext.md
@@ -0,0 +1,7 @@
+# `core_slice_ext`
+
+The tracking issue for this feature is: [#32110]
+
+[#32110]: https://github.com/rust-lang/rust/issues/32110
+
+------------------------
diff --git a/src/doc/unstable-book/src/core-str-ext.md b/src/doc/unstable-book/src/core-str-ext.md
new file mode 100644
index 00000000000..08c68f11c6e
--- /dev/null
+++ b/src/doc/unstable-book/src/core-str-ext.md
@@ -0,0 +1,7 @@
+# `core_str_ext`
+
+The tracking issue for this feature is: [#32110]
+
+[#32110]: https://github.com/rust-lang/rust/issues/32110
+
+------------------------
diff --git a/src/doc/unstable-book/src/dec2flt.md b/src/doc/unstable-book/src/dec2flt.md
new file mode 100644
index 00000000000..311ab4adcfd
--- /dev/null
+++ b/src/doc/unstable-book/src/dec2flt.md
@@ -0,0 +1,5 @@
+# `dec2flt`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/decode-utf8.md b/src/doc/unstable-book/src/decode-utf8.md
new file mode 100644
index 00000000000..b96854ebcd4
--- /dev/null
+++ b/src/doc/unstable-book/src/decode-utf8.md
@@ -0,0 +1,7 @@
+# `decode_utf8`
+
+The tracking issue for this feature is: [#27783]
+
+[#27783]: https://github.com/rust-lang/rust/issues/27783
+
+------------------------
diff --git a/src/doc/unstable-book/src/derive-clone-copy.md b/src/doc/unstable-book/src/derive-clone-copy.md
new file mode 100644
index 00000000000..cc603911cbd
--- /dev/null
+++ b/src/doc/unstable-book/src/derive-clone-copy.md
@@ -0,0 +1,5 @@
+# `derive_clone_copy`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/derive-eq.md b/src/doc/unstable-book/src/derive-eq.md
new file mode 100644
index 00000000000..68a275f5419
--- /dev/null
+++ b/src/doc/unstable-book/src/derive-eq.md
@@ -0,0 +1,5 @@
+# `derive_eq`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/discriminant-value.md b/src/doc/unstable-book/src/discriminant-value.md
new file mode 100644
index 00000000000..2f99f5ecab3
--- /dev/null
+++ b/src/doc/unstable-book/src/discriminant-value.md
@@ -0,0 +1,7 @@
+# `discriminant_value`
+
+The tracking issue for this feature is: [#24263]
+
+[#24263]: https://github.com/rust-lang/rust/issues/24263
+
+------------------------
diff --git a/src/doc/unstable-book/src/enumset.md b/src/doc/unstable-book/src/enumset.md
new file mode 100644
index 00000000000..24c8d8fa7db
--- /dev/null
+++ b/src/doc/unstable-book/src/enumset.md
@@ -0,0 +1,7 @@
+# `enumset`
+
+The tracking issue for this feature is: [#37966]
+
+[#37966]: https://github.com/rust-lang/rust/issues/37966
+
+------------------------
diff --git a/src/doc/unstable-book/src/error-type-id.md b/src/doc/unstable-book/src/error-type-id.md
new file mode 100644
index 00000000000..be7a3ffd4dc
--- /dev/null
+++ b/src/doc/unstable-book/src/error-type-id.md
@@ -0,0 +1,7 @@
+# `error_type_id`
+
+The tracking issue for this feature is: [#27745]
+
+[#27745]: https://github.com/rust-lang/rust/issues/27745
+
+------------------------
diff --git a/src/doc/unstable-book/src/exact-size-is-empty.md b/src/doc/unstable-book/src/exact-size-is-empty.md
new file mode 100644
index 00000000000..200ec387251
--- /dev/null
+++ b/src/doc/unstable-book/src/exact-size-is-empty.md
@@ -0,0 +1,7 @@
+# `exact_size_is_empty`
+
+The tracking issue for this feature is: [#35428]
+
+[#35428]: https://github.com/rust-lang/rust/issues/35428
+
+------------------------
diff --git a/src/doc/unstable-book/src/fd-read.md b/src/doc/unstable-book/src/fd-read.md
new file mode 100644
index 00000000000..e78d4330abf
--- /dev/null
+++ b/src/doc/unstable-book/src/fd-read.md
@@ -0,0 +1,5 @@
+# `fd_read`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/fd.md b/src/doc/unstable-book/src/fd.md
new file mode 100644
index 00000000000..0414244285b
--- /dev/null
+++ b/src/doc/unstable-book/src/fd.md
@@ -0,0 +1,5 @@
+# `fd`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/field-init-shorthand.md b/src/doc/unstable-book/src/field-init-shorthand.md
deleted file mode 100644
index e737dbaa4ec..00000000000
--- a/src/doc/unstable-book/src/field-init-shorthand.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# `field_init_shorthand`
-
-The tracking issue for this feature is: [#37340]
-
-[#37340]: https://github.com/rust-lang/rust/issues/37340
-
-------------------------
-
-
-
diff --git a/src/doc/unstable-book/src/fixed-size-array.md b/src/doc/unstable-book/src/fixed-size-array.md
new file mode 100644
index 00000000000..9e24e6a0850
--- /dev/null
+++ b/src/doc/unstable-book/src/fixed-size-array.md
@@ -0,0 +1,7 @@
+# `fixed_size_array`
+
+The tracking issue for this feature is: [#27778]
+
+[#27778]: https://github.com/rust-lang/rust/issues/27778
+
+------------------------
diff --git a/src/doc/unstable-book/src/float-extras.md b/src/doc/unstable-book/src/float-extras.md
new file mode 100644
index 00000000000..ff2d20a545f
--- /dev/null
+++ b/src/doc/unstable-book/src/float-extras.md
@@ -0,0 +1,7 @@
+# `float_extras`
+
+The tracking issue for this feature is: [#27752]
+
+[#27752]: https://github.com/rust-lang/rust/issues/27752
+
+------------------------
diff --git a/src/doc/unstable-book/src/flt2dec.md b/src/doc/unstable-book/src/flt2dec.md
new file mode 100644
index 00000000000..15e62a3a7da
--- /dev/null
+++ b/src/doc/unstable-book/src/flt2dec.md
@@ -0,0 +1,5 @@
+# `flt2dec`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/fmt-flags-align.md b/src/doc/unstable-book/src/fmt-flags-align.md
new file mode 100644
index 00000000000..755263bd9a6
--- /dev/null
+++ b/src/doc/unstable-book/src/fmt-flags-align.md
@@ -0,0 +1,7 @@
+# `fmt_flags_align`
+
+The tracking issue for this feature is: [#27726]
+
+[#27726]: https://github.com/rust-lang/rust/issues/27726
+
+------------------------
diff --git a/src/doc/unstable-book/src/fmt-internals.md b/src/doc/unstable-book/src/fmt-internals.md
new file mode 100644
index 00000000000..7cbe3c89a64
--- /dev/null
+++ b/src/doc/unstable-book/src/fmt-internals.md
@@ -0,0 +1,5 @@
+# `fmt_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/fn-traits.md b/src/doc/unstable-book/src/fn-traits.md
new file mode 100644
index 00000000000..3942cda5538
--- /dev/null
+++ b/src/doc/unstable-book/src/fn-traits.md
@@ -0,0 +1,7 @@
+# `fn_traits`
+
+The tracking issue for this feature is: [#29625]
+
+[#29625]: https://github.com/rust-lang/rust/issues/29625
+
+------------------------
diff --git a/src/doc/unstable-book/src/fnbox.md b/src/doc/unstable-book/src/fnbox.md
new file mode 100644
index 00000000000..a9b74d4f004
--- /dev/null
+++ b/src/doc/unstable-book/src/fnbox.md
@@ -0,0 +1,7 @@
+# `fnbox`
+
+The tracking issue for this feature is: [#28796]
+
+[#28796]: https://github.com/rust-lang/rust/issues/28796
+
+------------------------
diff --git a/src/doc/unstable-book/src/fused.md b/src/doc/unstable-book/src/fused.md
new file mode 100644
index 00000000000..460555bf1b0
--- /dev/null
+++ b/src/doc/unstable-book/src/fused.md
@@ -0,0 +1,7 @@
+# `fused`
+
+The tracking issue for this feature is: [#35602]
+
+[#35602]: https://github.com/rust-lang/rust/issues/35602
+
+------------------------
diff --git a/src/doc/unstable-book/src/future-atomic-orderings.md b/src/doc/unstable-book/src/future-atomic-orderings.md
new file mode 100644
index 00000000000..40c2ef2db05
--- /dev/null
+++ b/src/doc/unstable-book/src/future-atomic-orderings.md
@@ -0,0 +1,5 @@
+# `future_atomic_orderings`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/get-type-id.md b/src/doc/unstable-book/src/get-type-id.md
new file mode 100644
index 00000000000..afdb030c406
--- /dev/null
+++ b/src/doc/unstable-book/src/get-type-id.md
@@ -0,0 +1,7 @@
+# `get_type_id`
+
+The tracking issue for this feature is: [#27745]
+
+[#27745]: https://github.com/rust-lang/rust/issues/27745
+
+------------------------
diff --git a/src/doc/unstable-book/src/heap-api.md b/src/doc/unstable-book/src/heap-api.md
new file mode 100644
index 00000000000..01404e49dbd
--- /dev/null
+++ b/src/doc/unstable-book/src/heap-api.md
@@ -0,0 +1,7 @@
+# `heap_api`
+
+The tracking issue for this feature is: [#27700]
+
+[#27700]: https://github.com/rust-lang/rust/issues/27700
+
+------------------------
diff --git a/src/doc/unstable-book/src/i128.md b/src/doc/unstable-book/src/i128.md
new file mode 100644
index 00000000000..a1a7ce8e63f
--- /dev/null
+++ b/src/doc/unstable-book/src/i128.md
@@ -0,0 +1,7 @@
+# `i128`
+
+The tracking issue for this feature is: [#35118]
+
+[#35118]: https://github.com/rust-lang/rust/issues/35118
+
+------------------------
diff --git a/src/doc/unstable-book/src/inclusive-range.md b/src/doc/unstable-book/src/inclusive-range.md
new file mode 100644
index 00000000000..2e88e204786
--- /dev/null
+++ b/src/doc/unstable-book/src/inclusive-range.md
@@ -0,0 +1,7 @@
+# `inclusive_range`
+
+The tracking issue for this feature is: [#28237]
+
+[#28237]: https://github.com/rust-lang/rust/issues/28237
+
+------------------------
diff --git a/src/doc/unstable-book/src/int-error-internals.md b/src/doc/unstable-book/src/int-error-internals.md
new file mode 100644
index 00000000000..402e4fa5ef6
--- /dev/null
+++ b/src/doc/unstable-book/src/int-error-internals.md
@@ -0,0 +1,5 @@
+# `int_error_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/integer-atomics.md b/src/doc/unstable-book/src/integer-atomics.md
new file mode 100644
index 00000000000..50db9fd4ca4
--- /dev/null
+++ b/src/doc/unstable-book/src/integer-atomics.md
@@ -0,0 +1,7 @@
+# `integer_atomics`
+
+The tracking issue for this feature is: [#32976]
+
+[#32976]: https://github.com/rust-lang/rust/issues/32976
+
+------------------------
diff --git a/src/doc/unstable-book/src/into-boxed-c-str.md b/src/doc/unstable-book/src/into-boxed-c-str.md
new file mode 100644
index 00000000000..0d94b4fc560
--- /dev/null
+++ b/src/doc/unstable-book/src/into-boxed-c-str.md
@@ -0,0 +1,7 @@
+# `into_boxed_c_str`
+
+The tracking issue for this feature is: [#40380]
+
+[#40380]: https://github.com/rust-lang/rust/issues/40380
+
+------------------------
diff --git a/src/doc/unstable-book/src/into-boxed-os-str.md b/src/doc/unstable-book/src/into-boxed-os-str.md
new file mode 100644
index 00000000000..7636e20b14d
--- /dev/null
+++ b/src/doc/unstable-book/src/into-boxed-os-str.md
@@ -0,0 +1,7 @@
+# `into_boxed_os_str`
+
+The tracking issue for this feature is: [#into_boxed_os_str]
+
+[#into_boxed_os_str]: https://github.com/rust-lang/rust/issues/40380
+
+------------------------
diff --git a/src/doc/unstable-book/src/into-boxed-path.md b/src/doc/unstable-book/src/into-boxed-path.md
new file mode 100644
index 00000000000..754c6042f07
--- /dev/null
+++ b/src/doc/unstable-book/src/into-boxed-path.md
@@ -0,0 +1,7 @@
+# `into_boxed_path`
+
+The tracking issue for this feature is: [#40380]
+
+[#40380]: https://github.com/rust-lang/rust/issues/40380
+
+------------------------
diff --git a/src/doc/unstable-book/src/io-error-internals.md b/src/doc/unstable-book/src/io-error-internals.md
new file mode 100644
index 00000000000..5bee18d33d6
--- /dev/null
+++ b/src/doc/unstable-book/src/io-error-internals.md
@@ -0,0 +1,5 @@
+# `io_error_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/io.md b/src/doc/unstable-book/src/io.md
new file mode 100644
index 00000000000..ed6cae24e32
--- /dev/null
+++ b/src/doc/unstable-book/src/io.md
@@ -0,0 +1,7 @@
+# `io`
+
+The tracking issue for this feature is: [#27802]
+
+[#27802]: https://github.com/rust-lang/rust/issues/27802
+
+------------------------
diff --git a/src/doc/unstable-book/src/ip.md b/src/doc/unstable-book/src/ip.md
new file mode 100644
index 00000000000..7e7d52adbdb
--- /dev/null
+++ b/src/doc/unstable-book/src/ip.md
@@ -0,0 +1,7 @@
+# `ip`
+
+The tracking issue for this feature is: [#27709]
+
+[#27709]: https://github.com/rust-lang/rust/issues/27709
+
+------------------------
diff --git a/src/doc/unstable-book/src/is-unique.md b/src/doc/unstable-book/src/is-unique.md
new file mode 100644
index 00000000000..6070006758b
--- /dev/null
+++ b/src/doc/unstable-book/src/is-unique.md
@@ -0,0 +1,7 @@
+# `is_unique`
+
+The tracking issue for this feature is: [#28356]
+
+[#28356]: https://github.com/rust-lang/rust/issues/28356
+
+------------------------
diff --git a/src/doc/unstable-book/src/iter-rfind.md b/src/doc/unstable-book/src/iter-rfind.md
new file mode 100644
index 00000000000..44471449034
--- /dev/null
+++ b/src/doc/unstable-book/src/iter-rfind.md
@@ -0,0 +1,7 @@
+# `iter_rfind`
+
+The tracking issue for this feature is: [#39480]
+
+[#39480]: https://github.com/rust-lang/rust/issues/39480
+
+------------------------
diff --git a/src/doc/unstable-book/src/libstd-io-internals.md b/src/doc/unstable-book/src/libstd-io-internals.md
new file mode 100644
index 00000000000..8bcc2769db7
--- /dev/null
+++ b/src/doc/unstable-book/src/libstd-io-internals.md
@@ -0,0 +1,5 @@
+# `libstd_io_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/libstd-sys-internals.md b/src/doc/unstable-book/src/libstd-sys-internals.md
new file mode 100644
index 00000000000..1b53faa8a00
--- /dev/null
+++ b/src/doc/unstable-book/src/libstd-sys-internals.md
@@ -0,0 +1,5 @@
+# `libstd_sys_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/libstd-thread-internals.md b/src/doc/unstable-book/src/libstd-thread-internals.md
new file mode 100644
index 00000000000..b682d12e7cd
--- /dev/null
+++ b/src/doc/unstable-book/src/libstd-thread-internals.md
@@ -0,0 +1,5 @@
+# `libstd_thread_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/linked-list-extras.md b/src/doc/unstable-book/src/linked-list-extras.md
new file mode 100644
index 00000000000..be3b96aea70
--- /dev/null
+++ b/src/doc/unstable-book/src/linked-list-extras.md
@@ -0,0 +1,7 @@
+# `linked_list_extras`
+
+The tracking issue for this feature is: [#27794]
+
+[#27794]: https://github.com/rust-lang/rust/issues/27794
+
+------------------------
diff --git a/src/doc/unstable-book/src/lookup-host.md b/src/doc/unstable-book/src/lookup-host.md
new file mode 100644
index 00000000000..b60e7a01094
--- /dev/null
+++ b/src/doc/unstable-book/src/lookup-host.md
@@ -0,0 +1,7 @@
+# `lookup_host`
+
+The tracking issue for this feature is: [#27705]
+
+[#27705]: https://github.com/rust-lang/rust/issues/27705
+
+------------------------
diff --git a/src/doc/unstable-book/src/map-entry-recover-keys.md b/src/doc/unstable-book/src/map-entry-recover-keys.md
new file mode 100644
index 00000000000..2d15aa0e90d
--- /dev/null
+++ b/src/doc/unstable-book/src/map-entry-recover-keys.md
@@ -0,0 +1,5 @@
+# `map_entry_recover_keys`
+
+The tracking issue for this feature is: [#34285]
+
+[#34285]: https://github.com/rust-lang/rust/issues/34285
diff --git a/src/doc/unstable-book/src/mpsc-select.md b/src/doc/unstable-book/src/mpsc-select.md
new file mode 100644
index 00000000000..1405b6c5cb2
--- /dev/null
+++ b/src/doc/unstable-book/src/mpsc-select.md
@@ -0,0 +1,5 @@
+# `mpsc_select`
+
+The tracking issue for this feature is: [#27800]
+
+[#27800]: https://github.com/rust-lang/rust/issues/27800
diff --git a/src/doc/unstable-book/src/n16.md b/src/doc/unstable-book/src/n16.md
new file mode 100644
index 00000000000..e556adaa13e
--- /dev/null
+++ b/src/doc/unstable-book/src/n16.md
@@ -0,0 +1,5 @@
+# `n16`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/never-type-impls.md b/src/doc/unstable-book/src/never-type-impls.md
new file mode 100644
index 00000000000..4063cd0db01
--- /dev/null
+++ b/src/doc/unstable-book/src/never-type-impls.md
@@ -0,0 +1,7 @@
+# `never_type_impls`
+
+The tracking issue for this feature is: [#35121]
+
+[#35121]: https://github.com/rust-lang/rust/issues/35121
+
+------------------------
diff --git a/src/doc/unstable-book/src/nonzero.md b/src/doc/unstable-book/src/nonzero.md
new file mode 100644
index 00000000000..f200f8e2786
--- /dev/null
+++ b/src/doc/unstable-book/src/nonzero.md
@@ -0,0 +1,7 @@
+# `nonzero`
+
+The tracking issue for this feature is: [#27730]
+
+[#27730]: https://github.com/rust-lang/rust/issues/27730
+
+------------------------
diff --git a/src/doc/unstable-book/src/once-poison.md b/src/doc/unstable-book/src/once-poison.md
new file mode 100644
index 00000000000..3c16cafae50
--- /dev/null
+++ b/src/doc/unstable-book/src/once-poison.md
@@ -0,0 +1,7 @@
+# `once_poison`
+
+The tracking issue for this feature is: [#33577]
+
+[#33577]: https://github.com/rust-lang/rust/issues/33577
+
+------------------------
diff --git a/src/doc/unstable-book/src/oom.md b/src/doc/unstable-book/src/oom.md
new file mode 100644
index 00000000000..908caeb75c6
--- /dev/null
+++ b/src/doc/unstable-book/src/oom.md
@@ -0,0 +1,7 @@
+# `oom`
+
+The tracking issue for this feature is: [#27700]
+
+[#27700]: https://github.com/rust-lang/rust/issues/27700
+
+------------------------
diff --git a/src/doc/unstable-book/src/option-entry.md b/src/doc/unstable-book/src/option-entry.md
new file mode 100644
index 00000000000..edb4efc09e5
--- /dev/null
+++ b/src/doc/unstable-book/src/option-entry.md
@@ -0,0 +1,7 @@
+# `option_entry`
+
+The tracking issue for this feature is: [#39288]
+
+[#39288]: https://github.com/rust-lang/rust/issues/39288
+
+------------------------
diff --git a/src/doc/unstable-book/src/osstring-shrink-to-fit.md b/src/doc/unstable-book/src/osstring-shrink-to-fit.md
new file mode 100644
index 00000000000..21dc7d095c8
--- /dev/null
+++ b/src/doc/unstable-book/src/osstring-shrink-to-fit.md
@@ -0,0 +1,7 @@
+# `osstring_shrink_to_fit`
+
+The tracking issue for this feature is: [#40421]
+
+[#40421]: https://github.com/rust-lang/rust/issues/40421
+
+------------------------
diff --git a/src/doc/unstable-book/src/panic-abort.md b/src/doc/unstable-book/src/panic-abort.md
new file mode 100644
index 00000000000..07a95762690
--- /dev/null
+++ b/src/doc/unstable-book/src/panic-abort.md
@@ -0,0 +1,7 @@
+# `panic_abort`
+
+The tracking issue for this feature is: [#32837]
+
+[#32837]: https://github.com/rust-lang/rust/issues/32837
+
+------------------------
diff --git a/src/doc/unstable-book/src/panic-unwind.md b/src/doc/unstable-book/src/panic-unwind.md
new file mode 100644
index 00000000000..840e492597b
--- /dev/null
+++ b/src/doc/unstable-book/src/panic-unwind.md
@@ -0,0 +1,7 @@
+# `panic_unwind`
+
+The tracking issue for this feature is: [#32837]
+
+[#32837]: https://github.com/rust-lang/rust/issues/32837
+
+------------------------
diff --git a/src/doc/unstable-book/src/pattern.md b/src/doc/unstable-book/src/pattern.md
new file mode 100644
index 00000000000..e76ee6beb67
--- /dev/null
+++ b/src/doc/unstable-book/src/pattern.md
@@ -0,0 +1,7 @@
+# `pattern`
+
+The tracking issue for this feature is: [#27721]
+
+[#27721]: https://github.com/rust-lang/rust/issues/27721
+
+------------------------
diff --git a/src/doc/unstable-book/src/peek.md b/src/doc/unstable-book/src/peek.md
new file mode 100644
index 00000000000..c42b4e995ec
--- /dev/null
+++ b/src/doc/unstable-book/src/peek.md
@@ -0,0 +1,7 @@
+# `peek`
+
+The tracking issue for this feature is: [#38980]
+
+[#38980]: https://github.com/rust-lang/rust/issues/38980
+
+------------------------
diff --git a/src/doc/unstable-book/src/placement-in.md b/src/doc/unstable-book/src/placement-in.md
new file mode 100644
index 00000000000..6ff010b7e38
--- /dev/null
+++ b/src/doc/unstable-book/src/placement-in.md
@@ -0,0 +1,7 @@
+# `placement_in`
+
+The tracking issue for this feature is: [#27779]
+
+[#27779]: https://github.com/rust-lang/rust/issues/27779
+
+------------------------
diff --git a/src/doc/unstable-book/src/placement-new-protocol.md b/src/doc/unstable-book/src/placement-new-protocol.md
new file mode 100644
index 00000000000..d53225f0a35
--- /dev/null
+++ b/src/doc/unstable-book/src/placement-new-protocol.md
@@ -0,0 +1,7 @@
+# `placement_new_protocol`
+
+The tracking issue for this feature is: [#27779]
+
+[#27779]: https://github.com/rust-lang/rust/issues/27779
+
+------------------------
diff --git a/src/doc/unstable-book/src/print.md b/src/doc/unstable-book/src/print.md
new file mode 100644
index 00000000000..dc25cb237e3
--- /dev/null
+++ b/src/doc/unstable-book/src/print.md
@@ -0,0 +1,5 @@
+# `print`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/proc-macro-internals.md b/src/doc/unstable-book/src/proc-macro-internals.md
new file mode 100644
index 00000000000..ea087c0a4f7
--- /dev/null
+++ b/src/doc/unstable-book/src/proc-macro-internals.md
@@ -0,0 +1,7 @@
+# `proc_macro_internals`
+
+The tracking issue for this feature is: [#27812]
+
+[#27812]: https://github.com/rust-lang/rust/issues/27812
+
+------------------------
diff --git a/src/doc/unstable-book/src/process-try-wait.md b/src/doc/unstable-book/src/process-try-wait.md
new file mode 100644
index 00000000000..3593b642349
--- /dev/null
+++ b/src/doc/unstable-book/src/process-try-wait.md
@@ -0,0 +1,7 @@
+# `process_try_wait`
+
+The tracking issue for this feature is: [#38903]
+
+[#38903]: https://github.com/rust-lang/rust/issues/38903
+
+------------------------
diff --git a/src/doc/unstable-book/src/pub-restricted.md b/src/doc/unstable-book/src/pub-restricted.md
new file mode 100644
index 00000000000..6b1e88b8603
--- /dev/null
+++ b/src/doc/unstable-book/src/pub-restricted.md
@@ -0,0 +1,7 @@
+# `pub_restricted`
+
+The tracking issue for this feature is: [#32409]
+
+[#38356]: https://github.com/rust-lang/rust/issues/32409
+
+------------------------
diff --git a/src/doc/unstable-book/src/question-mark-carrier.md b/src/doc/unstable-book/src/question-mark-carrier.md
new file mode 100644
index 00000000000..56154acc02b
--- /dev/null
+++ b/src/doc/unstable-book/src/question-mark-carrier.md
@@ -0,0 +1,7 @@
+# `question_mark_carrier`
+
+The tracking issue for this feature is: [#31436]
+
+[#31436]: https://github.com/rust-lang/rust/issues/31436
+
+------------------------
diff --git a/src/doc/unstable-book/src/rand.md b/src/doc/unstable-book/src/rand.md
new file mode 100644
index 00000000000..d0229d94c20
--- /dev/null
+++ b/src/doc/unstable-book/src/rand.md
@@ -0,0 +1,5 @@
+# `rand`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/range-contains.md b/src/doc/unstable-book/src/range-contains.md
new file mode 100644
index 00000000000..ac4581faf2a
--- /dev/null
+++ b/src/doc/unstable-book/src/range-contains.md
@@ -0,0 +1,7 @@
+# `range_contains`
+
+The tracking issue for this feature is: [#32311]
+
+[#32311]: https://github.com/rust-lang/rust/issues/32311
+
+------------------------
diff --git a/src/doc/unstable-book/src/raw.md b/src/doc/unstable-book/src/raw.md
new file mode 100644
index 00000000000..d7caf22813d
--- /dev/null
+++ b/src/doc/unstable-book/src/raw.md
@@ -0,0 +1,7 @@
+# `raw`
+
+The tracking issue for this feature is: [#27751]
+
+[#27751]: https://github.com/rust-lang/rust/issues/27751
+
+------------------------
diff --git a/src/doc/unstable-book/src/rc-would-unwrap.md b/src/doc/unstable-book/src/rc-would-unwrap.md
new file mode 100644
index 00000000000..462387dfdcc
--- /dev/null
+++ b/src/doc/unstable-book/src/rc-would-unwrap.md
@@ -0,0 +1,5 @@
+# `rc_would_unwrap`
+
+The tracking issue for this feature is: [#28356]
+
+[#28356]: https://github.com/rust-lang/rust/issues/28356
diff --git a/src/doc/unstable-book/src/retain-hash-collection.md b/src/doc/unstable-book/src/retain-hash-collection.md
new file mode 100644
index 00000000000..c9ba5acf020
--- /dev/null
+++ b/src/doc/unstable-book/src/retain-hash-collection.md
@@ -0,0 +1,7 @@
+# `retain_hash_collection`
+
+The tracking issue for this feature is: [#36648]
+
+[#36648]: https://github.com/rust-lang/rust/issues/36648
+
+------------------------
diff --git a/src/doc/unstable-book/src/rt.md b/src/doc/unstable-book/src/rt.md
new file mode 100644
index 00000000000..007acc207a6
--- /dev/null
+++ b/src/doc/unstable-book/src/rt.md
@@ -0,0 +1,5 @@
+# `rt`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/rustc-private.md b/src/doc/unstable-book/src/rustc-private.md
new file mode 100644
index 00000000000..2453475efe5
--- /dev/null
+++ b/src/doc/unstable-book/src/rustc-private.md
@@ -0,0 +1,7 @@
+# `rustc_private`
+
+The tracking issue for this feature is: [#27812]
+
+[#27812]: https://github.com/rust-lang/rust/issues/27812
+
+------------------------
diff --git a/src/doc/unstable-book/src/rustdoc.md b/src/doc/unstable-book/src/rustdoc.md
new file mode 100644
index 00000000000..c7491ab034b
--- /dev/null
+++ b/src/doc/unstable-book/src/rustdoc.md
@@ -0,0 +1,7 @@
+# `rustdoc`
+
+The tracking issue for this feature is: [#27812]
+
+[#27812]: https://github.com/rust-lang/rust/issues/27812
+
+------------------------
diff --git a/src/doc/unstable-book/src/sanitizer-runtime-lib.md b/src/doc/unstable-book/src/sanitizer-runtime-lib.md
new file mode 100644
index 00000000000..82ae67fc05a
--- /dev/null
+++ b/src/doc/unstable-book/src/sanitizer-runtime-lib.md
@@ -0,0 +1,5 @@
+# `sanitizer_runtime_lib`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/set-stdio.md b/src/doc/unstable-book/src/set-stdio.md
new file mode 100644
index 00000000000..7dbdcdaa1a2
--- /dev/null
+++ b/src/doc/unstable-book/src/set-stdio.md
@@ -0,0 +1,5 @@
+# `set_stdio`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/shared.md b/src/doc/unstable-book/src/shared.md
new file mode 100644
index 00000000000..b79d1212c62
--- /dev/null
+++ b/src/doc/unstable-book/src/shared.md
@@ -0,0 +1,7 @@
+# `shared`
+
+The tracking issue for this feature is: [#27730]
+
+[#27730]: https://github.com/rust-lang/rust/issues/27730
+
+------------------------
diff --git a/src/doc/unstable-book/src/sip-hash-13.md b/src/doc/unstable-book/src/sip-hash-13.md
new file mode 100644
index 00000000000..8f69c3ab2de
--- /dev/null
+++ b/src/doc/unstable-book/src/sip-hash-13.md
@@ -0,0 +1,7 @@
+# `sip_hash_13`
+
+The tracking issue for this feature is: [#34767]
+
+[#34767]: https://github.com/rust-lang/rust/issues/34767
+
+------------------------
diff --git a/src/doc/unstable-book/src/slice-concat-ext.md b/src/doc/unstable-book/src/slice-concat-ext.md
new file mode 100644
index 00000000000..9ba2de5adc7
--- /dev/null
+++ b/src/doc/unstable-book/src/slice-concat-ext.md
@@ -0,0 +1,7 @@
+# `slice_concat_ext`
+
+The tracking issue for this feature is: [#27747]
+
+[#27747]: https://github.com/rust-lang/rust/issues/27747
+
+------------------------
diff --git a/src/doc/unstable-book/src/slice-get-slice.md b/src/doc/unstable-book/src/slice-get-slice.md
new file mode 100644
index 00000000000..57e2c148e79
--- /dev/null
+++ b/src/doc/unstable-book/src/slice-get-slice.md
@@ -0,0 +1,7 @@
+# `slice_get_slice`
+
+The tracking issue for this feature is: [#35729]
+
+[#35729]: https://github.com/rust-lang/rust/issues/35729
+
+------------------------
diff --git a/src/doc/unstable-book/src/sort-internals.md b/src/doc/unstable-book/src/sort-internals.md
new file mode 100644
index 00000000000..6f2385e5300
--- /dev/null
+++ b/src/doc/unstable-book/src/sort-internals.md
@@ -0,0 +1,5 @@
+# `sort_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/static-recursion.md b/src/doc/unstable-book/src/static-recursion.md
deleted file mode 100644
index d419ea41c6f..00000000000
--- a/src/doc/unstable-book/src/static-recursion.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# `static_recursion`
-
-The tracking issue for this feature is: [#29719]
-
-[#29719]: https://github.com/rust-lang/rust/issues/29719
-
-------------------------
-
-
-
diff --git a/src/doc/unstable-book/src/step-by.md b/src/doc/unstable-book/src/step-by.md
new file mode 100644
index 00000000000..b649496cdd8
--- /dev/null
+++ b/src/doc/unstable-book/src/step-by.md
@@ -0,0 +1,7 @@
+# `step_by`
+
+The tracking issue for this feature is: [#27741]
+
+[#27741]: https://github.com/rust-lang/rust/issues/27741
+
+------------------------
diff --git a/src/doc/unstable-book/src/step-trait.md b/src/doc/unstable-book/src/step-trait.md
new file mode 100644
index 00000000000..e53ca13f7b6
--- /dev/null
+++ b/src/doc/unstable-book/src/step-trait.md
@@ -0,0 +1,7 @@
+# `step_trait`
+
+The tracking issue for this feature is: [#27741]
+
+[#27741]: https://github.com/rust-lang/rust/issues/27741
+
+------------------------
diff --git a/src/doc/unstable-book/src/str-escape.md b/src/doc/unstable-book/src/str-escape.md
new file mode 100644
index 00000000000..61e31c89443
--- /dev/null
+++ b/src/doc/unstable-book/src/str-escape.md
@@ -0,0 +1,7 @@
+# `str_escape`
+
+The tracking issue for this feature is: [#27791]
+
+[#27791]: https://github.com/rust-lang/rust/issues/27791
+
+------------------------
diff --git a/src/doc/unstable-book/src/str-internals.md b/src/doc/unstable-book/src/str-internals.md
new file mode 100644
index 00000000000..af8ef056dbe
--- /dev/null
+++ b/src/doc/unstable-book/src/str-internals.md
@@ -0,0 +1,5 @@
+# `str_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/thread-id.md b/src/doc/unstable-book/src/thread-id.md
new file mode 100644
index 00000000000..af3ea991025
--- /dev/null
+++ b/src/doc/unstable-book/src/thread-id.md
@@ -0,0 +1,7 @@
+# `thread_id`
+
+The tracking issue for this feature is: [#21507]
+
+[#21507]: https://github.com/rust-lang/rust/issues/21507
+
+------------------------
diff --git a/src/doc/unstable-book/src/thread-local-internals.md b/src/doc/unstable-book/src/thread-local-internals.md
new file mode 100644
index 00000000000..e1cdcc339d2
--- /dev/null
+++ b/src/doc/unstable-book/src/thread-local-internals.md
@@ -0,0 +1,5 @@
+# `thread_local_internals`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/thread-local-state.md b/src/doc/unstable-book/src/thread-local-state.md
new file mode 100644
index 00000000000..113c1e910dc
--- /dev/null
+++ b/src/doc/unstable-book/src/thread-local-state.md
@@ -0,0 +1,7 @@
+# `thread_local_state`
+
+The tracking issue for this feature is: [#27716]
+
+[#27716]: https://github.com/rust-lang/rust/issues/27716
+
+------------------------
diff --git a/src/doc/unstable-book/src/trusted-len.md b/src/doc/unstable-book/src/trusted-len.md
new file mode 100644
index 00000000000..80213cf1fdb
--- /dev/null
+++ b/src/doc/unstable-book/src/trusted-len.md
@@ -0,0 +1,7 @@
+# `trusted_len`
+
+The tracking issue for this feature is: [#37572]
+
+[#37572]: https://github.com/rust-lang/rust/issues/37572
+
+------------------------
diff --git a/src/doc/unstable-book/src/try-from.md b/src/doc/unstable-book/src/try-from.md
new file mode 100644
index 00000000000..d763caff5aa
--- /dev/null
+++ b/src/doc/unstable-book/src/try-from.md
@@ -0,0 +1,7 @@
+# `try_from`
+
+The tracking issue for this feature is: [#33417]
+
+[#33417]: https://github.com/rust-lang/rust/issues/33417
+
+------------------------
diff --git a/src/doc/unstable-book/src/unicode.md b/src/doc/unstable-book/src/unicode.md
new file mode 100644
index 00000000000..9fecec2ac36
--- /dev/null
+++ b/src/doc/unstable-book/src/unicode.md
@@ -0,0 +1,7 @@
+# `unicode`
+
+The tracking issue for this feature is: [#27783]
+
+[#27783]: https://github.com/rust-lang/rust/issues/27783
+
+------------------------
diff --git a/src/doc/unstable-book/src/unique.md b/src/doc/unstable-book/src/unique.md
new file mode 100644
index 00000000000..99a3490d106
--- /dev/null
+++ b/src/doc/unstable-book/src/unique.md
@@ -0,0 +1,7 @@
+# `unique`
+
+The tracking issue for this feature is: [#27730]
+
+[#27730]: https://github.com/rust-lang/rust/issues/27730
+
+------------------------
diff --git a/src/doc/unstable-book/src/unsize.md b/src/doc/unstable-book/src/unsize.md
new file mode 100644
index 00000000000..92807e2858f
--- /dev/null
+++ b/src/doc/unstable-book/src/unsize.md
@@ -0,0 +1,7 @@
+# `unsize`
+
+The tracking issue for this feature is: [#27732]
+
+[#27732]: https://github.com/rust-lang/rust/issues/27732
+
+------------------------
diff --git a/src/doc/unstable-book/src/update-panic-count.md b/src/doc/unstable-book/src/update-panic-count.md
new file mode 100644
index 00000000000..d315647ba10
--- /dev/null
+++ b/src/doc/unstable-book/src/update-panic-count.md
@@ -0,0 +1,5 @@
+# `update_panic_count`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/utf8-error-error-len.md b/src/doc/unstable-book/src/utf8-error-error-len.md
new file mode 100644
index 00000000000..1c14a5a9fa0
--- /dev/null
+++ b/src/doc/unstable-book/src/utf8-error-error-len.md
@@ -0,0 +1,7 @@
+# `utf8_error_error_len`
+
+The tracking issue for this feature is: [#40494]
+
+[#40494]: https://github.com/rust-lang/rust/issues/40494
+
+------------------------
diff --git a/src/doc/unstable-book/src/vec-remove-item.md b/src/doc/unstable-book/src/vec-remove-item.md
new file mode 100644
index 00000000000..2b8c9f046ee
--- /dev/null
+++ b/src/doc/unstable-book/src/vec-remove-item.md
@@ -0,0 +1,7 @@
+# `vec_remove_item`
+
+The tracking issue for this feature is: [#40062]
+
+[#40062]: https://github.com/rust-lang/rust/issues/40062
+
+------------------------
diff --git a/src/doc/unstable-book/src/windows-c.md b/src/doc/unstable-book/src/windows-c.md
new file mode 100644
index 00000000000..3f833eb3d09
--- /dev/null
+++ b/src/doc/unstable-book/src/windows-c.md
@@ -0,0 +1,5 @@
+# `windows_c`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/windows-handle.md b/src/doc/unstable-book/src/windows-handle.md
new file mode 100644
index 00000000000..f47a8425045
--- /dev/null
+++ b/src/doc/unstable-book/src/windows-handle.md
@@ -0,0 +1,5 @@
+# `windows_handle`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/windows-net.md b/src/doc/unstable-book/src/windows-net.md
new file mode 100644
index 00000000000..174960d4f00
--- /dev/null
+++ b/src/doc/unstable-book/src/windows-net.md
@@ -0,0 +1,5 @@
+# `windows_net`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/windows-stdio.md b/src/doc/unstable-book/src/windows-stdio.md
new file mode 100644
index 00000000000..4d361442386
--- /dev/null
+++ b/src/doc/unstable-book/src/windows-stdio.md
@@ -0,0 +1,5 @@
+# `windows_stdio`
+
+This feature is internal to the Rust compiler and is not intended for general use.
+
+------------------------
diff --git a/src/doc/unstable-book/src/zero-one.md b/src/doc/unstable-book/src/zero-one.md
new file mode 100644
index 00000000000..4d1cf38c3c2
--- /dev/null
+++ b/src/doc/unstable-book/src/zero-one.md
@@ -0,0 +1,7 @@
+# `zero_one`
+
+The tracking issue for this feature is: [#27739]
+
+[#27739]: https://github.com/rust-lang/rust/issues/27739
+
+------------------------