Top rustfmt issues

[unstable option] merge_imports

unstable option

Unclear error message: Rustfmt failed … line exceeded maximum length (sorry)

allow optional programmer discretion on chain length/function arguments per line

poor-formatting

Support directives to control whether rustfmt runs on a section of code

rustfmt should avoid rightwards drifting big blocks of code

p-high poor-formatting

rustfmt can't load some dynamic libraries on macOS

proposal: groupping of imports

a-imports feature-request

cargo install rustfmt-nightly fails with binary already exists, but cargo fmt says toolchain doesn't have binary

Limit chain length by number of calls as well as width

a-chains p-low poor-formatting

Error while loading libsyntax