[RFA] Add inclusive range support for Rust

[Tom Tromey]

>>>>> "Tom" == Tom Tromey <tom@tromey.com> writes:

Tom> Rust recently stabilized the inclusive range feature:
Tom>     https://github.com/rust-lang/rust/issues/28237
[...]

Tom> Note that review is required because this patch touches some non-Rust
Tom> code.

Ping.

Tom