persist errors in modules

src/Lib/Types.newt

@@ -403,6 +403,7 @@ record ModContext where
   -- longer term maybe drop this, put the operator decls in ctxDefs and collect them on import
   ctxOps : Operators
   modDeps : List (List String)
+  modErrors : List Error
 
 -- Top level context.
 -- Most of the reason this is separate is to have a different type
@@ -413,7 +414,7 @@ record ModContext where
 
 -- A placeholder while walking through dependencies of a module
 emptyModCtx : String → ModContext
-emptyModCtx csum = MkModCtx csum emptyMap (MC emptyMap Nil 0 NoCheck) emptyMap Nil
+emptyModCtx csum = MkModCtx csum emptyMap (MC emptyMap Nil 0 NoCheck) emptyMap Nil Nil
 
 HintTable : U
 HintTable = SortedMap QName (List (QName × Tm))