fixes #13646

tests/metatype/tmetatype_various.nim

@@ -1,4 +1,7 @@
-
+discard """
+  output: '''[1, 0, 0, 0, 0, 0, 0, 0]
+ CTBool[Ct[system.uint32]]'''
+"""
 
 block tconstraints:
   proc myGenericProc[T: object|tuple|int|ptr|ref|distinct](x: T): string =
@@ -37,13 +40,29 @@ block tfieldaccessor:
 block tprocbothmeta:
   proc myFun[A](x: A): auto =
     result = float(x+10)
-  
+
   proc myMap[T,S](sIn: seq[T], f: proc (q: T): S): seq[S] =
     result = newSeq[S](sIn.len)
     for i in 0..<sIn.len:
       result[i] = f(sIn[i])
-  
+
   assert myMap(@[1,2,3], myFun) == @[11.0, 12.0, 13.0]
 
 
+# https://github.com/nim-lang/Nim/issues/13646
+
+type
+  BaseUint* = SomeUnsignedInt or byte
+  Ct*[T] = distinct T
+    ## Constant-Time wrapper
+    ## Only constant-time operations in particular the ternary operator equivalent
+    ##   condition: if true: a else: b
+    ## are allowed
+
+  CTBool*[T] = distinct range[T(0)..T(1)]
+    ## Constant-Time boolean wrapper
+
+var x: array[8, CTBool[Ct[uint32]]]
+x[0] = (CTBool[Ct[uint32]])(1)
+echo x.repr, " ", typeof(x[0])