Add methods to convert Operation to Expr

Author: jamesjscully

src/operations.jl

@@ -63,3 +63,9 @@ Base.convert(::Type{Operation}, x::Number) = Operation(identity, Expression[Cons
 Base.convert(::Type{Operation}, x::Operation) = x
 Base.convert(::Type{Operation}, x::Expression) = Operation(identity, Expression[x])
 Operation(x) = convert(Operation, x)
+
+#convert to Expr
+Base.Expr(op::Operation) = 
+    op.op isa Variable ? op.op.name : Expr(:call, Symbol(op.op), Expr.(op.args)...)
+Base.convert(::Type{Expr},x::Operation) = Expr(x)
+end