attempt to fix a critical memory leak in Nim's collections

lib/pure/collections/sets.nim

@@ -261,6 +261,8 @@ template doWhile(a: expr, b: stmt): stmt =
     b
     if not a: break
 
+proc default[T](t: typedesc[T]): T {.inline.} = discard
+
 proc excl*[A](s: var HashSet[A], key: A) =
   ## Excludes `key` from the set `s`.
   ##
@@ -277,11 +279,13 @@ proc excl*[A](s: var HashSet[A], key: A) =
   var msk = high(s.data)
   if i >= 0:
     s.data[i].hcode = 0
+    s.data[i].key = default(type(s.data[i].key))
     dec(s.counter)
     while true:         # KnuthV3 Algo6.4R adapted for i=i+1 instead of i=i-1
       var j = i         # The correctness of this depends on (h+1) in nextTry,
       var r = j         # though may be adaptable to other simple sequences.
       s.data[i].hcode = 0              # mark current EMPTY
+      s.data[i].key = default(type(s.data[i].key))
       doWhile ((i >= r and r > j) or (r > j and j > i) or (j > i and i >= r)):
         i = (i + 1) and msk            # increment mod table size
         if isEmpty(s.data[i].hcode):   # end of collision cluster; So all done

lib/pure/collections/tableimpl.nim

@@ -110,18 +110,24 @@ template hasKeyOrPutImpl(enlarge) {.dirty, immediate.} =
     maybeRehashPutImpl(enlarge)
   else: result = true
 
+proc default[T](t: typedesc[T]): T {.inline.} = discard
+
 template delImpl() {.dirty, immediate.} =
   var hc: Hash
   var i = rawGet(t, key, hc)
   let msk = maxHash(t)
   if i >= 0:
     t.data[i].hcode = 0
+    t.data[i].key = default(type(t.data[i].key))
+    t.data[i].val = default(type(t.data[i].val))
     dec(t.counter)
     block outer:
       while true:         # KnuthV3 Algo6.4R adapted for i=i+1 instead of i=i-1
         var j = i         # The correctness of this depends on (h+1) in nextTry,
         var r = j         # though may be adaptable to other simple sequences.
         t.data[i].hcode = 0              # mark current EMPTY
+        t.data[i].key = default(type(t.data[i].key))
+        t.data[i].val = default(type(t.data[i].val))
         while true:
           i = (i + 1) and msk            # increment mod table size
           if isEmpty(t.data[i].hcode):   # end of collision cluster; So all done
@@ -137,4 +143,6 @@ template delImpl() {.dirty, immediate.} =
 template clearImpl() {.dirty, immediate.} =
   for i in 0 .. <t.data.len:
     t.data[i].hcode = 0
+    t.data[i].key = default(type(t.data[i].key))
+    t.data[i].val = default(type(t.data[i].val))
   t.counter = 0