stop using types before they are defined

Author: simeonschaub

src/differentials.jl

@@ -48,14 +48,9 @@ wrapped by `x`, such that mutating `extern(x)` might mutate `x` itself.
 abstract type AbstractWirtinger <: AbstractDifferential end
 
 unwrap_wirtinger(x) = x
-unwrap_wirtinger(x::Union{Casted,AbstractThunk}) = unwrap_wirtinger(extern(x))
 
 wirtinger_primal(x) = x
-wirtinger_primal(x::Union{Casted,AbstractThunk}) =
-    throw(ArgumentError("`wirtinger_primal` is not defined for $(typeof(x)). Call `unwrap_wirtinger` first")
 wirtinger_conjugate(::Any) = Zero()
-wirtinger_primal(x::Union{Casted,AbstractThunk}) =
-    throw(ArgumentError("`wirtinger_conjugate` is not defined for $(typeof(x)). Call `unwrap_wirtinger` first")
 
 extern(x::AbstractWirtinger) = throw(ArgumentError("`AbstractWirtinger` cannot be converted to an external type."))
 
@@ -214,6 +209,13 @@ end
     return element, (externed, new_state)
 end
 
+unwrap_wirtinger(x::Union{Casted,AbstractThunk}) = unwrap_wirtinger(extern(x))
+
+wirtinger_primal(x::Union{Casted,AbstractThunk}) =
+    throw(ArgumentError("`wirtinger_primal` is not defined for $(typeof(x)). Call `unwrap_wirtinger` first"))
+wirtinger_primal(x::Union{Casted,AbstractThunk}) =
+    throw(ArgumentError("`wirtinger_conjugate` is not defined for $(typeof(x)). Call `unwrap_wirtinger` first"))
+
 #####
 ##### `Thunk`
 #####