fix(runtime): stringify host callback errors

Author: mpiton

runtime/src/plugin.rs

@@ -338,7 +338,8 @@ fn relink(
                         stringify!($name),
                         t,
                         |caller, params, results| {
-                            pdk::$name(caller, params, results).map_err(wasmtime::Error::from)
+                            pdk::$name(caller, params, results)
+                                .map_err(|err| wasmtime::Error::msg(err.to_string()))
                         },
                     )?;
                 )*
@@ -409,7 +410,7 @@ fn relink(
         let ns = f.namespace().unwrap_or(EXTISM_USER_MODULE);
         let func = f.f.clone();
         linker.func_new(ns, name, f.ty(engine).clone(), move |caller, params, results| {
-            func(caller, params, results).map_err(wasmtime::Error::from)
+            func(caller, params, results).map_err(|err| wasmtime::Error::msg(err.to_string()))
         })?;
     }