fixes #20900; Calling template through from generic function across module fails to build (#21649)

* fixes #20900; Calling template through from generic function across module fails to build

* sanother way

(cherry picked from commit 16f42084d3)

tests/generics/m3770.nim

@@ -1,6 +1,11 @@
 type
   Noice* = object
     hidden: int
-  
+
 template jjj*: Noice =
-  Noice(hidden: 15)
+  Noice(hidden: 15)
+
+type Opt* = object
+  o: int
+
+template none*(O: type Opt): Opt = Opt(o: 0)

tests/generics/t3770.nim

@@ -7,3 +7,7 @@ proc someGeneric(_: type) =
   doAssert $jjj() == "(hidden: 15)" # fails: "Error: the field 'hidden' is not accessible."
 
 someGeneric(int)
+
+# bug #20900
+proc c(y: int | int, w: Opt = Opt.none) = discard
+c(0)