Generated by changing rustfmt.toml as follows and running `cargo +nightly fmt`:

    max_width = 80                       # previously 79
    use_small_heuristics = "Max"         # previously "Default"
    single_line_if_else_max_width = 50   # previously 50% of 79 = 39
    single_line_let_else_max_width = 50  # previously 50% of 79 = 39

This is net -825 LOC. For context, we have about 45K non-blank lines of Rust.

This changes max_width from 79 to 80 to be the same as Python (see project.toml,
.flake8, and contrib/pylintrc), and adds use_small_heuristics = "Max". The
default "small heuristics" make rustfmt use a smaller max_width for many
constructs, e.g. struct literals can only be 18% of max_width before wrapping.
This leads to aggressive line wrapping, especially as our max_width is down from
the default of 100. With "Max", wrapping only occurs after 100% of max_width.
The one change to "Max" we make is to restrict single-line if-else expressions
to 50 characters rather than the full 80.

For more details see:
https://rust-lang.github.io/rustfmt/?version=v1.6.0&search=#use_small_heuristics

# skip-blame mass-reformating only