add copyto! and unsafe_copyto!

README.md

@@ -273,6 +273,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `unshift!` and `shift!` are now `pushfirst!` and `popfirst!` ([#25100]).
 
+* `copy!` and `unsafe_copy!` are now `copyto!` and `unsafe_copyto!` ([#24808]).
+
 * `ipermute!` is now `invpermute!` ([#25168]).
 
 ## New macros
@@ -435,4 +437,4 @@ includes this fix. Find the minimum version from there.
 [#25162]: https://github.com/JuliaLang/julia/issues/25162
 [#25165]: https://github.com/JuliaLang/julia/issues/25165
 [#25168]: https://github.com/JuliaLang/julia/issues/25168
-[#25113]: https://github.com/JuliaLang/julia/issues/25113
+[#25113]: https://github.com/JuliaLang/julia/issues/25113

src/Compat.jl

@@ -1070,6 +1070,13 @@ end
         replace(s, first(pat_rep), last(pat_rep), count)
 end
 
+# 0.7.0-DEV.3057
+@static if !isdefined(Base, :copyto!)
+    const copyto! = Base.copy!
+    const unsafe_copyto! = Base.unsafe_copy!
+    export copyto!, unsafe_copyto!
+end
+
 @static if VERSION < v"0.7.0-DEV.3025"
     import Base: convert, ndims, getindex, size, length, eltype,
                  start, next, done, first, last

test/runtests.jl

@@ -1069,6 +1069,14 @@ let coolvec = [1,2,3]
     @test popfirst!(coolvec) == 0
 end
 
+# 0.7.0-DEV.3057
+let A = [0, 0, 0], B = [1, 2, 3]
+    @test copyto!(A, B) === A == B
+end
+let A = [0, 0, 0], B = [1, 2, 3]
+    @test unsafe_copyto!(A, 2, B, 1, 1) === A == [0, 1, 0]
+end
+
 # 0.7.0-DEV.3173
 @test invpermute!(permute!([1, 2], 2:-1:1), 2:-1:1) == [1, 2]