refactor: reduce compilation

Author: MilesCranmer

Project.toml

@@ -5,6 +5,7 @@ version = "2.0.0"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
+Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
 DispatchDoctor = "8d63f2c5-f18a-4cf2-ba9d-b3f60fc568c8"
 Interfaces = "85a1e053-f937-4924-92a5-1367d23b7b87"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
@@ -30,6 +31,7 @@ DynamicExpressionsZygoteExt = "Zygote"
 [compat]
 Bumper = "0.6"
 ChainRulesCore = "1"
+Compat = "4.16"
 DispatchDoctor = "0.4"
 Interfaces = "0.3"
 LoopVectorization = "0.12"

src/Simplify.jl

@@ -1,5 +1,7 @@
 module SimplifyModule
 
+using Compat: Fix
+
 import ..NodeModule:
     AbstractExpressionNode, constructorof, Node, copy_node, set_node!, set_child!, get_child
 import ..NodeUtilsModule: tree_mapreduce, is_node_constant
@@ -127,7 +129,7 @@ end
 # Simplify tree
 function simplify_tree!(tree::AbstractExpressionNode, operators::AbstractOperatorEnum)
     return tree_mapreduce(
-        identity, (p, c...) -> combine_children!(operators, p, c...), tree, typeof(tree);
+        identity, Fix{1}(combine_children!, operators), tree, typeof(tree)
     )
 end