add equality operator

ranges/typedranges.nim

@@ -66,6 +66,10 @@ proc `[]`*[T](r: Range[T], idx: int): T {.inline.} =
   assert(idx < r.len)
   r.start.shift(idx)[]
 
+proc `==`*[T](a, b: Range[T]): bool =
+  if a.len != b.len: return false
+  equalMem(a.start, b.start, sizeof(T) * a.len)
+
 iterator ptrs[T](r: Range[T]): (int, ptr T) =
   var p = r.start
   var i = 0

tests/ttypedranges.nim

@@ -19,3 +19,10 @@ suite "Typed ranges":
     let b = toRange(@[1, 2, 3])
     a[1 .. 3] = b
     check a.toSeq == @[0, 1, 2, 3, 0]
+
+  test "equality operator":
+    var x = toRange(@[0, 1, 2, 3, 4, 5])
+    var y = x[1 .. ^2]
+    var z = toRange(@[1, 2, 3, 4])
+    check y == z
+    check x != z