std: Standardize (input, output) param orderings

This functions swaps the order of arguments to a few functions that previously
took (output, input) parameters, but now take (input, output) parameters (in
that order).

The affected functions are:

* ptr::copy
* ptr::copy_nonoverlapping
* slice::bytes::copy_memory
* intrinsics::copy
* intrinsics::copy_nonoverlapping

Closes #22890
[breaking-change]

1 files changed, 3 insertions, 6 deletions

diff --git a/src/libcoretest/ptr.rs b/src/libcoretest/ptr.rs
index bdb56c9f867..8f1017c50a3 100644
--- a/src/libcoretest/ptr.rs
+++ b/src/libcoretest/ptr.rs
@@ -35,18 +35,15 @@ fn test() {
         let v0 = vec![32000u16, 32001u16, 32002u16];
         let mut v1 = vec![0u16, 0u16, 0u16];
 
-        copy(v1.as_mut_ptr().offset(1),
-             v0.as_ptr().offset(1), 1);
+        copy(v0.as_ptr().offset(1), v1.as_mut_ptr().offset(1), 1);
         assert!((v1[0] == 0u16 &&
                  v1[1] == 32001u16 &&
                  v1[2] == 0u16));
-        copy(v1.as_mut_ptr(),
-             v0.as_ptr().offset(2), 1);
+        copy(v0.as_ptr().offset(2), v1.as_mut_ptr(), 1);
         assert!((v1[0] == 32002u16 &&
                  v1[1] == 32001u16 &&
                  v1[2] == 0u16));
-        copy(v1.as_mut_ptr().offset(2),
-             v0.as_ptr(), 1);
+        copy(v0.as_ptr(), v1.as_mut_ptr().offset(2), 1);
         assert!((v1[0] == 32002u16 &&
                  v1[1] == 32001u16 &&
                  v1[2] == 32000u16));