made test green

tests/tuples/tuple_with_seq.nim

@@ -0,0 +1,46 @@
+discard """
+  output: '''it's nil
+@[1, 2, 3]'''
+"""
+
+template foo(s: string = nil) =
+  if isNil(s):
+    echo "it's nil"
+  else:
+    echo s
+
+foo
+
+
+# bug #2632
+
+proc takeTup(x: tuple[s: string;x: seq[int]]) =
+  discard
+
+takeTup(("foo", @[]))
+
+
+#proc foobar(): () =
+
+proc f(xs: seq[int]) =
+  discard
+
+proc g(t: tuple[n:int, xs:seq[int]]) =
+  discard
+
+when isMainModule:
+  f(@[]) # OK
+  g((1,@[1])) # OK
+  g((0,@[])) # NG
+
+
+# bug #2630
+type T = tuple[a: seq[int], b: int]
+
+var t: T = (@[1,2,3], 7)
+
+proc test(s: seq[int]): T =
+  echo s
+  (s, 7)
+
+t = test(t.a)