clean up code

Author: pfitzseb

src/breakpoints.jl

@@ -188,16 +188,10 @@ function shouldbreak(frame::Frame, pc::Int)
 end
 
 function prepare_slotfunction(framecode::FrameCode, body::Union{Symbol,Expr})
-    uslotnames = Set{Symbol}()
     framename, dataname = gensym("frame"), gensym("data")
     assignments = Expr[:($dataname = $framename.framedata)]
     default = Unassigned()
-    for slotname in framecode.src.slotnames
-        if slotname ∉ uslotnames
-            push!(uslotnames, slotname)
-        else
-            continue
-        end
+    for slotname in unique(framecode.src.slotnames)
         list = framecode.slotnamelists[slotname]
         if length(list) == 1
             maxexpr = :($dataname.last_reference[$(list[1])] > 0 ? $(list[1]) : 0)