Enable more of the Allowed-by-default lints in rustc

* macro_use_extern_crate - Forbid #[macro_use] to bring macros into
  global scope. Even using `extern crate` is deprecated by now, so just
  extra protection against that
* explicit_outlives_requirements - Warn aginst explicit lifetime bounds
  that can be inferred from the code. Keeps noise away.
* absolute_paths_not_starting_with_crate - Catches Rust 2015 style
  absolute paths and denies them.
* missing_abi - Force explicitly stating the ABI of `extern` items. Less
  implicit code
* unused_lifetimes - Warn if you have lifetimes that are not used. Same
  reason as warning against unused variables
* unused_macro_rules - Warn if you have a declarative macro with a rule
  that is never used. Basically same reason as warning on unused
  variables. Removes dead code

0 files changed, 0 insertions, 0 deletions