Define VersionNumber(::VersionNumber)

Project.toml

@@ -1,6 +1,6 @@
 name = "Compat"
 uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
-version = "4.11.0"
+version = "4.12.0"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

README.md

@@ -120,6 +120,8 @@ changes in `julia`.
 
 * `pkgversion(m::Module)` returns the version of the package that loaded a given module ([#45607]) (since Compat 4.11)
 
+* `VersionNumber(::VersionNumber)` defined as a no-op constructor ([#45052]) (since Compat 4.12)
+
 ## Developer tips
 
 One of the most important rules for `Compat.jl` is to avoid breaking user code
@@ -172,6 +174,7 @@ Note that you should specify the correct minimum version for `Compat` in the
 [#43334]: https://github.com/JuliaLang/julia/issues/43334
 [#43354]: https://github.com/JuliaLang/julia/issues/43354
 [#43852]: https://github.com/JuliaLang/julia/issues/43852
+[#45052]: https://github.com/JuliaLang/julia/issues/45052
 [#45607]: https://github.com/JuliaLang/julia/issues/45607
 [#46104]: https://github.com/JuliaLang/julia/issues/46104
 [#48038]: https://github.com/JuliaLang/julia/issues/48038

src/Compat.jl

@@ -770,6 +770,11 @@ if VERSION < v"1.7.0-DEV.1187"
     export redirect_stdio
 end
 
+# https://github.com/JuliaLang/julia/pull/45052
+if VERSION < v"1.9.0-DEV.461"
+    Base.VersionNumber(v::VersionNumber) = v
+end
+
 include("deprecated.jl")
 
 end # module Compat

test/runtests.jl

@@ -728,3 +728,9 @@ end
     @test_throws LoadError @eval @compat public @bar foo
     @test_throws LoadError @eval @compat publac @bar, foo
 end
+
+# https://github.com/JuliaLang/julia/pull/45052
+@testset "VersionNumber no-op constructor" begin
+    v = VersionNumber("1.2.3")
+    @test VersionNumber(v) === v
+end