Add test case

tests/closure/tcapture.nim

@@ -2,11 +2,24 @@ discard """
   output: '''
 to be, or not to be'''
   joinable: false
+(v: 1)
+(v: 1)
 """
 
 import sequtils, sugar
 
 let m = @[proc (s: string): string = "to " & s, proc (s: string): string = "not to " & s]
 var l = m.mapIt(capture([it], proc (s: string): string = it(s)))
 let r = l.mapIt(it("be"))
-echo r[0] & ", or " & r[1]
+echo r[0] & ", or " & r[1]
+
+type O = object
+  v: int
+var o = O(v: 1)
+var execute: proc()
+capture [o]:
+  execute = proc() =
+    echo o
+execute()
+o.v = -1
+execute()