To give another example, a change was made in the type inference engine for rustc 1.18 that resulted it in no longer inferring types in circumstances where rust

To give another example, a change was made in the type inference engine for rustc 1.18 that resulted it in no longer inferring types in circumstances where rustc 1.17 did infer types. https://github.com/rust-lang/rust/issues/42545 https://github.com/rust-lang/rust/issues/42545