src/test/ui/lint/issue-83477.stderr

   1 warning: unknown lint: `rustc::foo::bar::default_hash_types`
   2   --> $DIR/issue-83477.rs:5:9
   3    |
   4 LL | #[allow(rustc::foo::bar::default_hash_types)]
   5    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `rustc::default_hash_types`
   6    |
   7    = note: `#[warn(unknown_lints)]` on by default
   8
   9 warning: unknown lint: `rustc::foo::default_hash_types`
  10   --> $DIR/issue-83477.rs:9:9
  11    |
  12 LL | #[allow(rustc::foo::default_hash_types)]
  13    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `rustc::default_hash_types`
  14
  15 warning: prefer `FxHashMap` over `HashMap`, it has better performance
  16   --> $DIR/issue-83477.rs:14:13
  17    |
  18 LL |     let _ = std::collections::HashMap::<String, String>::new();
  19    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  20    |
  21 note: the lint level is defined here
  22   --> $DIR/issue-83477.rs:3:9
  23    |
  24 LL | #![warn(rustc::internal)]
  25    |         ^^^^^^^^^^^^^^^
  26    = note: `#[warn(rustc::default_hash_types)]` implied by `#[warn(rustc::internal)]`
  27    = note: a `use rustc_data_structures::fx::FxHashMap` may be necessary
  28
  29 warning: 3 warnings emitted
  30