Fn results using stabby

[mptagliari]

I'm studying the ABI from stabby in order to developing an interface to load symbols from a shared library and i get a little confused about the error handlig and functions related methods. Since the libloading method on stabby has only one way to do the things, my workarround (or a try to do it) to hold the dynamically loaded library and to get the symbols from it is:

use stabby::{abi::Result, libloading::{Symbol,StabbyLibrary}, string::String};
pub struct LibFunctions<L: StabbyLibrary> {
    lib: L,
}

impl<L: StabbyLibrary> LibFunctions<L> {
    pub fn get_symbol<T>(&self, symbol_name: &str) -> Result<Symbol<T>, Box<dyn Error>>
    where
        T: 'static,
    {
        unsafe {
            self.lib.get_stabbied::<T>(symbol_name.as_bytes())
                .map_err(|e| Box::new(e) as Box<dyn Error>)
        }
    }
}

but then i got a nice error:

error[E0277]: the trait bound `std::boxed::Box<(dyn std::error::Error + 'static)>: IStable` is not satisfied
  --> ndi-lib\src\lib.rs:29:55
   |
29 |     pub fn get_symbol<T>(&self, symbol_name: &str) -> Result<Symbol<T>, Box<dyn Error>>
   |                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `IStable` is not implemented for `std::boxed::Box<(dyn std::error::Error + 'static)>`
   |
   = help: the following other types implement trait `IStable`:
             bool
             isize
             i8
             i16
             i32
             i64
             i128
             usize
           and 400 others
note: required by a bound in `stabby::stabby_abi::Result`
   |
30 | pub struct Result<Ok, Err>
   |            ------ required by a bound in this struct
...
33 |     Err: IStable,
   |          ^^^^^^^ required by this bound in `Result`

I couldnt find into the documentation a way to define the errors to the stabby methods....