fixes #3112

tests/metatype/tstaticvector.nim

@@ -1,17 +1,39 @@
+discard """
+  output: '''0
+0
+2
+100'''
+"""
 
 type
   RectArray*[R, C: static[int], T] = distinct array[R * C, T]
-   
+
   StaticMatrix*[R, C: static[int], T] = object
     elements*: RectArray[R, C, T]
-   
+
   StaticVector*[N: static[int], T] = StaticMatrix[N, 1, T]
- 
+
 proc foo*[N, T](a: StaticVector[N, T]): T = 0.T
 proc foobar*[N, T](a, b: StaticVector[N, T]): T = 0.T
- 
- 
+
+
 var a: StaticVector[3, int]
- 
+
 echo foo(a) # OK
-echo foobar(a, a) # <--- hangs compiler 
+echo foobar(a, a) # <--- hangs compiler
+
+# bug #3112
+
+type
+  Vector[N: static[int]] = array[N, float64]
+  TwoVectors[Na, Nb: static[int]] = tuple
+    a: Vector[Na]
+    b: Vector[Nb]
+
+when isMainModule:
+  var v: TwoVectors[2, 100]
+  echo v[0].len
+  echo v[1].len
+  #let xx = 50
+  v[1][50] = 0.0
+