Auto merge of #48171 - FraGag:doc-copy-clone-impls, r=nikomatsakis

Better document the implementors of Clone and Copy

There are two parts to this change. The first part is a change to the compiler and to the standard library (specifically, libcore) to allow implementations of `Clone` and `Copy` to be written for a subset of builtin types. By adding these implementations to libcore, they now show up in the documentation. This is a [breaking-change] for users of `#![no_core]`, because they will now have to supply their own copy of the implementations of `Clone` and `Copy` that were added in libcore.

The second part is purely a documentation change to document the other implementors of `Clone` and `Copy` that cannot be described in Rust code (yet) and are thus provided by the compiler.

Fixes #25893

1 files changed, 6 insertions, 1 deletions

diff --git a/src/test/codegen/repeat-trusted-len.rs b/src/test/codegen/repeat-trusted-len.rs
index 43872f15d51..8b3294281e9 100644
--- a/src/test/codegen/repeat-trusted-len.rs
+++ b/src/test/codegen/repeat-trusted-len.rs
@@ -15,9 +15,14 @@
 
 use std::iter;
 
+// CHECK: @helper([[USIZE:i[0-9]+]] %arg0)
+#[no_mangle]
+pub fn helper(_: usize) {
+}
+
 // CHECK-LABEL: @repeat_take_collect
 #[no_mangle]
 pub fn repeat_take_collect() -> Vec<u8> {
-// CHECK: call void @llvm.memset.p0i8
+// CHECK: call void @llvm.memset.p0i8.[[USIZE]](i8* {{(nonnull )?}}%{{[0-9]+}}, i8 42, [[USIZE]] 100000, i32 1, i1 false)
     iter::repeat(42).take(100000).collect()
 }