fixes #1700

compiler/ccgtypes.nim

@@ -308,6 +308,10 @@ proc getTypeDescWeak(m: BModule; t: PType; check: var IntSet): PRope =
       let x = getUniqueType(etB)
       result = getTypeForward(m, x)
       pushType(m, x)
+  of tySequence:
+    let x = getUniqueType(etB)
+    result = getTypeForward(m, x).con("*")
+    pushType(m, x)
   else:
     result = getTypeDescAux(m, t, check)
 
@@ -430,6 +434,9 @@ proc genRecordFieldsAux(m: BModule, n: PNode,
       if fieldType.kind == tyArray and tfUncheckedArray in fieldType.flags:
         appf(result, "$1 $2[SEQ_DECL_SIZE];$n",
             [getTypeDescAux(m, fieldType.elemType, check), sname])
+      elif fieldType.kind == tySequence:
+        # we need to use a weak dependency here for trecursive_table.
+        appf(result, "$1 $2;$n", [getTypeDescWeak(m, field.loc.t, check), sname])
       else:
         # don't use fieldType here because we need the
         # tyGenericInst for C++ template support
@@ -484,7 +491,7 @@ proc getTupleDesc(m: BModule, typ: PType, name: PRope,
   for i in countup(0, sonsLen(typ) - 1):
     appf(desc, "$1 Field$2;$n",
          [getTypeDescAux(m, typ.sons[i], check), toRope(i)])
-  if (desc == nil): app(result, "char dummy;" & tnl)
+  if desc == nil: app(result, "char dummy;" & tnl)
   else: app(result, desc)
   app(result, "};" & tnl)
 

tests/ccgbugs/trecursive_table.nim

@@ -0,0 +1,17 @@
+
+# bug #1700
+import tables
+
+type
+  E* = enum
+    eX
+    eY
+  T* = object
+    case kind: E
+    of eX:
+      xVal: Table[string, T]
+    of eY:
+      nil
+
+proc p*(x: Table[string, T]) =
+  discard