Panic when accessing inherited extern specs for polymorphic methods

[Lysxia]

extern crate creusot_contracts;
use creusot_contracts::*;

use std::iter::FromIterator;

#[ensures(result@ == x@)]
pub fn id<A>(x: Vec<A>) -> Vec<A> {
    Vec::from_iter(x.into_iter())
}

thread 'rustc' panicked at /rustc/c1a6199e9d92bb785c17a6d7ffd8b8b552f79c10/compiler/rustc_type_ir/src/binder.rs:716:9:
type parameter `T/#2` (T/#2/2) out of range when instantiating, args=[std::vec::Vec<T/#0, std::alloc::Global>, T/#0]

The panic happens in creusot/src/translation/specification.rs, in the function contract_of. The problem is that the argument list returned by inherited_extern_spec only include arguments for the trait itself, and not additional arguments of the method.