Make RuntimeGeneratedFunction <: Function

Seems like a good place to put it in the type hierarchy.

Author: c42f

src/RuntimeGeneratedFunctions.jl

@@ -10,7 +10,7 @@ export @RuntimeGeneratedFunction
 
 This type should be constructed via the macro @RuntimeGeneratedFunction.
 """
-struct RuntimeGeneratedFunction{argnames,moduletag,id}
+struct RuntimeGeneratedFunction{argnames,moduletag,id} <: Function
     body::Expr
     function RuntimeGeneratedFunction(moduletag, ex)
         def = splitdef(ex)

test/runtests.jl

@@ -31,6 +31,8 @@ f1 = @RuntimeGeneratedFunction(ex1)
 f2 = @RuntimeGeneratedFunction(ex2)
 f3 = @RuntimeGeneratedFunction(ex3)
 
+@test f1 isa Function
+
 du = rand(2)
 u = rand(2)
 p = nothing