How to store &str dynamically when program is running

[livid ether]

What about s.downcast_ref::<&str>()

[livid ether]

Post the error from cargo check please, not a picture

[final cape]

error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> src/item.rs:59:64
    |
59  |         result = format!("\"{}\": {:?}", self.name, self.value.downcast_ref::<str>());//.expect("111").to_string());
    |                                                                ^^^^^^^^^^^^ doesn't have a size known at compile-time

[livid ether]

what about this?

[final cape]

thank ypu

[final cape]

hi again, your variant is always return None

[livid ether]

?play ```rust
use core::any::Any;

pub fn print_if_str(s: Box<dyn Any>) {
if let Some(s) = s.downcast_ref::<&str>() {
println!("It's a str({}): '{}'", s.len(), s);
} else {
println!("Not a str...");
}
}

fn main() {
print_if_str(Box::new("cookie monster"));
}```

[fluid raft]

     Running `target/debug/playground`

It's a str(14): 'cookie monster'

[final cape]

   18 pub struct Item {
   17 ▏   parent: Parent,
   16 ▏   value: Box<dyn Any>,
▎  15 ▏   name: &'static str,
   14 }
   13
   12 impl Item {
▎  11 ▏   pub fn new<T: 'static>(parent: Parent, value: T, name: &'static str) -> Self {
   10 ▏   ▏   Item { parent, value: Box::new(value), name }
    9 ▏   }
    8 ▏   pub fn print(&self) -> String {
▲   7 ▏   ▏   let mut result = String::new();
▎   6 ▏   ▏   result = format!("\"{}\": {:?}", self.name, self.value.downcast_ref::<&str>());//.expect
    5 ▏   ▏   for _ in 0..self.parent.pr as i32 {
    4 ▏   ▏   ▏   result = format!("    {}", result)
    3 ▏   ▏   }
    2 ▏   ▏   result
    1 ▏   }
  65  }

[livid ether]

do you have an example that can run?