Function cell 

pub fn cell(value: impl Display) -> Cell<impl RawCell>

Create Cell from Display.

The returned value owns the value passed in. Therefore, the returned value can not be move out of the lifetime of the passed value.

use text_grid::*;

fn f_error() -> Cell<impl RawCell> {
    let s = String::from("ABC");
    cell(&s) // Error : returns a value referencing data owned by the current function
}

use text_grid::*;

fn f_ok() -> Cell<impl RawCell> {
    let s = String::from("ABC");
    cell(s) // OK
}