Add pushfirst! and popfirst! (#444)

README.md

@@ -264,6 +264,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `Void` is now `Nothing` with an alias `Cvoid` for C interop ([#25162]).
 
+* `unshift!` and `shift!` are now `pushfirst!` and `popfirst!` ([#25100]).
+
 ## New macros
 
 * `@__DIR__` has been added ([#18380])
@@ -419,5 +421,6 @@ includes this fix. Find the minimum version from there.
 [#25021]: https://github.com/JuliaLang/julia/issues/25021
 [#25056]: https://github.com/JuliaLang/julia/issues/25056
 [#25057]: https://github.com/JuliaLang/julia/issues/25057
+[#25100]: https://github.com/JuliaLang/julia/issues/25100
 [#25102]: https://github.com/JuliaLang/julia/issues/25102
 [#25162]: https://github.com/JuliaLang/julia/issues/25162

src/Compat.jl

@@ -1052,6 +1052,13 @@ else
     import Base: notnothing
 end
 
+# 0.7.0-DEV.3155
+@static if !isdefined(Base, :pushfirst!)
+    const pushfirst! = unshift!
+    const popfirst! = shift!
+    export pushfirst!, popfirst!
+end
+
 include("deprecated.jl")
 
 end # module Compat

test/runtests.jl

@@ -1063,6 +1063,12 @@ end
 @test Compat.notnothing(1) == 1
 @test_throws ArgumentError Compat.notnothing(nothing)
 
+# 0.7.0-DEV.3155
+let coolvec = [1,2,3]
+    @test pushfirst!(coolvec, 0) == [0,1,2,3]
+    @test popfirst!(coolvec) == 0
+end
+
 if VERSION < v"0.6.0"
     include("deprecated.jl")
 end