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, 2 insertions, 2 deletions

diff --git a/src/libcore/fmt/float.rs b/src/libcore/fmt/float.rs
index 6e82b18abc6..6a5943265ca 100644
--- a/src/libcore/fmt/float.rs
+++ b/src/libcore/fmt/float.rs
@@ -316,8 +316,8 @@ pub fn float_to_str_bytes_common<T: Float, U, F>(
 
             impl<'a> fmt::Write for Filler<'a> {
                 fn write_str(&mut self, s: &str) -> fmt::Result {
-                    slice::bytes::copy_memory(&mut self.buf[(*self.end)..],
-                                              s.as_bytes());
+                    slice::bytes::copy_memory(s.as_bytes(),
+                                              &mut self.buf[(*self.end)..]);
                     *self.end += s.len();
                     Ok(())
                 }