use record update for top

src/Main.newt

@@ -154,7 +154,13 @@ processModule importFC base stk qn@(QN ns nm) = do
   top <- getTop
   let freshMC = MC emptyMap Nil 0 CheckAll
   -- set imported, mod, freshMC, ops  before processing
-  modifyTop (\ top => MkTop top.modules imported emptyMap modns emptyMap freshMC top.verbose top.errors ops)
+  modifyTop [ imported := imported
+            ; hints := emptyMap
+            ; ns := modns
+            ; defs := emptyMap
+            ; metaCtx := freshMC
+            ; ops := ops
+            ]
   for imported $ \ ns => do
     let (Just mod) = lookupMap' ns top.modules | _ => error emptyFC "namespace \{show ns} missing"
     importHints (listValues mod.modDefs)
@@ -234,7 +240,12 @@ processFile fn = do
 
   top <- getTop
   let modules = updateMap primNS (MkModCtx "" top.defs (MC emptyMap Nil 0 CheckAll) top.ops Nil) top.modules
-  modifyTop (\ top => MkTop modules (primNS :: Nil) emptyMap Nil emptyMap top.metaCtx top.verbose top.errors top.ops)
+  modifyTop [ modules := modules
+            ; imported := primNS :: Nil
+            ; hints := emptyMap
+            ; ns := Nil
+            ; defs := emptyMap
+            ]
 
   invalidateModule qn