fix nargs

Author: vchuravy

test/helpers/enzyme.jl

@@ -79,6 +79,7 @@ function deferred_codegen_id_generator(world::UInt, source, self, ft::Type, tt::
     ci = CC.retrieve_code_info(mi, world)
 
     # prepare a new code info
+    # TODO: Can we create a new CI instead of copying a "wrong" one?
     new_ci = copy(ci)
     empty!(new_ci.code)
     @static if isdefined(Core, :DebugInfo)
@@ -99,6 +100,7 @@ function deferred_codegen_id_generator(world::UInt, source, self, ft::Type, tt::
     # prepare the slots
     new_ci.slotnames = Symbol[Symbol("#self#"), :ft, :tt]
     new_ci.slotflags = UInt8[0x00 for i = 1:3]
+    new_ci.nargs = 3
 
     # We don't know the caller's target so EnzymeTarget uses the default NativeCompilerTarget.
     target = EnzymeTarget()