Hang in custom Vec

I tried this code:

struct Array<T> {
    data: Vec<T>
}
fn sum_arrays<T>(first: Array<T>) -> Array<T> {
    let mut result = Array {data: first.data.clone()};
    result.data.push(8);
    result
}
struct Vec<T> {data: Vec<T> }
impl<T> Vec<T> {
    pub fn push(mut self: &mut Self, object: &T) -> &mut Self {
        self
    }
}

Command: timeout 30s rustc file.rs

It did not finish within 30 seconds.

Meta

rustc --version --verbose:

rustc 1.93.0-nightly (c90bcb957 2025-11-06)
binary: rustc
commit-hash: c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
commit-date: 2025-11-06
host: aarch64-apple-darwin
release: 1.93.0-nightly
LLVM version: 21.1.3

<no backtrace>

Start by reproducing the hang with the provided code and timeout 30s rustc file.rs, using the reported nightly toolchain details as context. Investigate compiler behavior triggered by the custom Vec<T>::push signature and confirm that the minimal program finishes compiling; preserve the example as a regression case if the project’s compiler tests provide a suitable location.