Use min_exhaustive_patterns in core & std

Author: Nadrieril

library/core/src/lib.rs

@@ -203,7 +203,9 @@
 // Language features:
 // tidy-alphabetical-start
 #![cfg_attr(bootstrap, feature(diagnostic_namespace))]
+#![cfg_attr(bootstrap, feature(exhaustive_patterns))]
 #![cfg_attr(bootstrap, feature(platform_intrinsics))]
+#![cfg_attr(not(bootstrap), feature(min_exhaustive_patterns))]
 #![feature(abi_unadjusted)]
 #![feature(adt_const_params)]
 #![feature(allow_internal_unsafe)]
@@ -228,7 +230,6 @@
 #![feature(doc_cfg_hide)]
 #![feature(doc_notable_trait)]
 #![feature(effects)]
-#![feature(exhaustive_patterns)]
 #![feature(extern_types)]
 #![feature(fundamental)]
 #![feature(generic_arg_infer)]

library/std/src/lib.rs

@@ -270,7 +270,9 @@
 //
 // Language features:
 // tidy-alphabetical-start
+#![cfg_attr(bootstrap, feature(exhaustive_patterns))]
 #![cfg_attr(bootstrap, feature(platform_intrinsics))]
+#![cfg_attr(not(bootstrap), feature(min_exhaustive_patterns))]
 #![feature(alloc_error_handler)]
 #![feature(allocator_internals)]
 #![feature(allow_internal_unsafe)]
@@ -289,7 +291,6 @@
 #![feature(doc_masked)]
 #![feature(doc_notable_trait)]
 #![feature(dropck_eyepatch)]
-#![feature(exhaustive_patterns)]
 #![feature(if_let_guard)]
 #![feature(intra_doc_pointers)]
 #![feature(lang_items)]