Deprecate ^(x, p::Integer)

NEWS.md

@@ -1020,6 +1020,9 @@ Deprecated or removed
   * `DateTime()`, `Date()`, and `Time()` have been deprecated, instead use `DateTime(1)`, `Date(1)`
     and `Time(0)` respectively ([#23724]).
 
+  * The fallback method `^(x, p::Integer)` is deprecated. If your type relied on this definition,
+    add a method such as `^(x::MyType, p::Integer) = Base.power_by_squaring(x, p)` ([#23332]).
+
 Command-line option changes
 ---------------------------
 

base/deprecated.jl

@@ -1352,6 +1352,8 @@ end
 @deprecate IOBuffer(read::Bool, write::Bool) IOBuffer(read=read, write=write)
 @deprecate IOBuffer(maxsize::Integer) IOBuffer(read=true, write=true, maxsize=maxsize)
 
+# PR #23332
+@deprecate ^(x, p::Integer) power_by_squaring(x,p)
 
 # END 0.7 deprecations
 

base/intfuncs.jl

@@ -219,7 +219,6 @@ end
 
 ^(x::T, p::T) where {T<:Integer} = power_by_squaring(x,p)
 ^(x::Number, p::Integer)  = power_by_squaring(x,p)
-^(x, p::Integer)          = power_by_squaring(x,p)
 
 # x^p for any literal integer p is lowered to Base.literal_pow(^, x, Val(p))
 # to enable compile-time optimizations specialized to p.