no longer need special handling of begin after Setfield 0.7.1

Author: torfjelde

Project.toml

@@ -11,4 +11,5 @@ Setfield = "efcf1570-3423-57d1-acb7-fd33fddbac46"
 
 [compat]
 AbstractMCMC = "2, 3"
+Setfield = "0.7.1"
 julia = "1"

src/varname.jl

@@ -493,34 +493,6 @@ function drop_escape(expr::Expr)
     return Expr(expr.head, map(x -> drop_escape(x), expr.args)...)
 end
 
-@static if VERSION ≥ v"1.5.0-DEV.666"
-    # TODO: Replace once https://github.com/jw3126/Setfield.jl/pull/155 has been merged.
-    function Setfield.lower_index(collection::Symbol, index, dim)
-        if Setfield.isexpr(index, :call)
-            return Expr(:call, Setfield.lower_index.(collection, index.args, dim)...)
-        elseif (index === :end)
-            if dim === nothing
-                return :($(Base.lastindex)($collection))
-            else
-                return :($(Base.lastindex)($collection, $dim))
-            end
-        elseif index === :begin
-            if dim === nothing
-                return :($(Base.firstindex)($collection))
-            else
-                return :($(Base.firstindex)($collection, $dim))
-            end
-        end
-        return index
-    end
-
-    function Setfield.need_dynamic_lens(ex)
-        return Setfield.foldtree(false, ex) do yes, x
-            (yes || x === :end || x === :begin || x === :_)
-        end
-    end
-end
-
 """
     @vsym(expr)