diff --git a/src/interpret.jl b/src/interpret.jl
index 979997a2..119524e2 100644
--- a/src/interpret.jl
+++ b/src/interpret.jl
@@ -550,6 +550,8 @@ function step_expr!(@nospecialize(recurse), frame::Frame, @nospecialize(node), i
                     error("unexpected error statement ", node)
                 elseif node.head === :incomplete
                     error("incomplete statement ", node)
+                elseif node.head === :latestworld
+                    frame.world = Base.get_world_counter()
                 else
                     rhs = eval_rhs(recurse, frame, node)
                 end
diff --git a/src/types.jl b/src/types.jl
index 041a5b84..ad935213 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -253,8 +253,11 @@ mutable struct Frame
     caller::Union{Frame,Nothing}
     callee::Union{Frame,Nothing}
     last_codeloc::Int
+    # TODO: This is incompletely implemented
+    world::UInt
 end
-function Frame(framecode::FrameCode, framedata::FrameData, pc=1, caller=nothing)
+function Frame(framecode::FrameCode, framedata::FrameData, pc=1, caller=nothing,
+               world=isdefined(Base, :tls_world_age) ? Base.tls_world_age() : Base.get_world_counter())
     if length(junk_frames) > 0
         frame = pop!(junk_frames)
         frame.framecode = framecode
@@ -264,9 +267,10 @@ function Frame(framecode::FrameCode, framedata::FrameData, pc=1, caller=nothing)
         frame.caller = caller
         frame.callee = nothing
         frame.last_codeloc = 0
+        frame.world = world
         return frame
     else
-        return Frame(framecode, framedata, pc, 1, caller, nothing, 0)
+        return Frame(framecode, framedata, pc, 1, caller, nothing, 0, world)
     end
 end
 """