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-rw-r--r--compiler/semtypinst.nim12
1 files changed, 11 insertions, 1 deletions
diff --git a/compiler/semtypinst.nim b/compiler/semtypinst.nim
index cbd7999c7..c5caf8b92 100644
--- a/compiler/semtypinst.nim
+++ b/compiler/semtypinst.nim
@@ -233,7 +233,9 @@ proc instCopyType*(cl: var TReplTypeVars, t: PType): PType =
   # XXX: relying on allowMetaTypes is a kludge
   result = copyType(t, t.owner, cl.allowMetaTypes)
   result.flags.incl tfFromGeneric
-  result.flags.excl tfInstClearedFlags
+  if not (t.kind in tyMetaTypes or
+         (t.kind == tyStatic and t.n == nil)):
+    result.flags.excl tfInstClearedFlags
 
 proc handleGenericInvocation(cl: var TReplTypeVars, t: PType): PType =
   # tyGenericInvocation[A, tyGenericInvocation[A, B]]
@@ -418,15 +420,23 @@ proc replaceTypeVarsTAux(cl: var TReplTypeVars, t: PType): PType =
     result = t
 
   of tyGenericInst:
+    result = PType(idTableGet(cl.localCache, t))
+    if result != nil: return result
     result = instCopyType(cl, t)
+    idTablePut(cl.localCache, t, result)
     for i in 1 .. <result.sonsLen:
       result.sons[i] = replaceTypeVarsT(cl, result.sons[i])
     propagateToOwner(result, result.lastSon)
 
   else:
     if containsGenericType(t):
+      #if not cl.allowMetaTypes:
+      result = PType(idTableGet(cl.localCache, t))
+      if result != nil: return result
       result = instCopyType(cl, t)
       result.size = -1 # needs to be recomputed
+      #if not cl.allowMetaTypes:
+      idTablePut(cl.localCache, t, result)
 
       for i in countup(0, sonsLen(result) - 1):
         if result.sons[i] != nil: