fix 5756

tests/generics/tgenericconst.nim

@@ -0,0 +1,39 @@
+discard """
+output: '''
+@[1, 2]
+@[3, 4]
+1
+'''
+"""
+
+# https://github.com/nim-lang/Nim/issues/5756
+
+type
+  Vec*[N : static[int]] = object
+    x: int
+    arr*: array[N, int32]
+
+  Mat*[M,N: static[int]] = object
+    x: int
+    arr*: array[M, Vec[N]]
+
+proc vec2*(x,y:int32) : Vec[2] =
+  result.arr = [x,y]
+  result.x = 10
+
+proc mat2*(a,b: Vec[2]): Mat[2,2] =
+  result.arr = [a,b]
+  result.x = 20
+
+const M = mat2(vec2(1, 2), vec2(3, 4))
+
+let m1 = M
+echo @(m1.arr[0].arr)
+echo @(m1.arr[1].arr)
+
+proc foo =
+  let m2 = M
+  echo m1.arr[0].arr[0]
+
+foo()
+