don't copy RGF on deepcopy

This achieves similar behavior to normal Julia functions. Fixes #98.

Author: hexaeder

src/RuntimeGeneratedFunctions.jl

@@ -376,6 +376,9 @@ function Serialization.deserialize(s::AbstractSerializer,
     B === Nothing ? drop_expr(f) : f
 end
 
+# achieve deepcopy(f)===f behavior similar to "normal" julia functions
+Base.deepcopy_internal(f::RuntimeGeneratedFunction, stackdict::IdDict) = f
+
 @specialize
 
 end

test/runtests.jl

@@ -184,3 +184,8 @@ deserialized_f, deserialized_g = deserialize(buf)
 @test deserialized_f.body isa Expr
 @test deserialized_g(12) == "Serialization with dropped body. y=12"
 @test deserialized_g.body isa Nothing
+
+# deepcopy
+f = @RuntimeGeneratedFunction(:(x -> [x, x+1]))
+@test deepcopy(f) == f
+@test deepcopy(f) === f