Must use capture value

exercises/033_iferror.zig

@@ -30,7 +30,7 @@ pub fn main() void {
 
         var n = numberMaybeFail(num);
         if (n) |value| {
-            std.debug.print("=4. ", .{});
+            std.debug.print("={}. ", .{value});
         } else |err| switch (err) {
             MyNumberError.TooBig => std.debug.print(">4. ", .{}),
             // Please add a match for TooSmall here and have it print: "<4. "