Invalid `E0308` errors

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
v0.3.1877

rustc version: (eg. output of rustc -V)
rustc 1.78.0-nightly (397937d81 2024-02-22)

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)
Nothing to note.

repository link (if public, optional): (eg. rust-analyzer)
https://github.com/pola-rs/polars/tree/bb1aa267e92078a3e69bec6d94a4f8b5b8d840c7

code snippet to reproduce:

I couldn't manage to create a small reproducible example, but the issue is with the following file:
https://github.com/pola-rs/polars/blob/bb1aa267e92078a3e69bec6d94a4f8b5b8d840c7/crates/polars-core/src/series/any_value.rs

rust-analyzer finds two problems (E0308). However, when 'fixing' these problems, the code no longer compiles.

I am using rust-analyzer v0.3.1877 with VSCode on WSL2 with Ubuntu 22.02.

I hope this report helps address the issue. I am happy to provide more details if necessary.

Start by opening crates/polars-core/src/series/any_value.rs at the linked polars revision and reproduce the two E0308 diagnostics with rust-analyzer v0.3.1877 and the listed rustc version. Compare the reported errors and suggested fixes with the result from compiling the code; done means the diagnostics and fixes agree with the compiler.