Merge pull request #467 from SciML/remove-get-extension-compat

Remove Julia v1.9 get_extension compatibility code

Author: ChrisRackauckas

ext/RecursiveArrayToolsMeasurementsExt.jl

@@ -1,7 +1,7 @@
 module RecursiveArrayToolsMeasurementsExt
 
 import RecursiveArrayTools
-isdefined(Base, :get_extension) ? (import Measurements) : (import ..Measurements)
+import Measurements
 
 function RecursiveArrayTools.recursive_unitless_bottom_eltype(a::Type{
         <:Measurements.Measurement,

ext/RecursiveArrayToolsMonteCarloMeasurementsExt.jl

@@ -1,8 +1,7 @@
 module RecursiveArrayToolsMonteCarloMeasurementsExt
 
 import RecursiveArrayTools
-isdefined(Base, :get_extension) ? (import MonteCarloMeasurements) :
-(import ..MonteCarloMeasurements)
+import MonteCarloMeasurements
 
 function RecursiveArrayTools.recursive_unitless_bottom_eltype(a::Type{
         <:MonteCarloMeasurements.Particles,

ext/RecursiveArrayToolsTrackerExt.jl

@@ -1,7 +1,7 @@
 module RecursiveArrayToolsTrackerExt
 
 import RecursiveArrayTools
-isdefined(Base, :get_extension) ? (import Tracker) : (import ..Tracker)
+import Tracker
 
 function RecursiveArrayTools.recursivecopy!(b::AbstractArray{T, N},
         a::AbstractArray{T2, N}) where {

ext/RecursiveArrayToolsZygoteExt.jl

@@ -2,13 +2,9 @@ module RecursiveArrayToolsZygoteExt
 
 using RecursiveArrayTools
 
-if isdefined(Base, :get_extension)
-    using Zygote
-    using Zygote: FillArrays, ChainRulesCore, literal_getproperty, @adjoint
-else
-    using ..Zygote
-    using ..Zygote: FillArrays, ChainRulesCore, literal_getproperty, @adjoint
-end
+using Zygote
+using Zygote: FillArrays, ChainRulesCore, literal_getproperty, @adjoint
+
 
 # Define a new species of projection operator for this type:
 # ChainRulesCore.ProjectTo(x::VectorOfArray) = ChainRulesCore.ProjectTo{VectorOfArray}()