warning: explicit call to `.into_iter()` in function argument accepting `IntoIterator`
  --> src/lang/js.rs:38:20
   |
38 |             .chain(generics.into_iter())
   |                    ^^^^^^^^^^^^^^^^^^^^ help: consider removing the `.into_iter()`: `generics`
   |
note: this parameter accepts any `IntoIterator`, so you don't need to call `.into_iter()`
  --> /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/iter/traits/iterator.rs:522:12
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
   = note: `#[warn(clippy::useless_conversion)]` implied by `#[warn(clippy::all)]`

warning: useless use of `format!`
  --> src/lang/js.rs:28:25
   |
28 |         .map(|generics| format!("{}", generics.join(", ")).into());
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `generics.join(", ").to_string()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
note: the lint level is defined here
  --> src/lib.rs:58:9
   |
58 | #![warn(clippy::all, clippy::unwrap_used, clippy::panic)] // TODO: missing_docs
   |         ^^^^^^^^^^^
   = note: `#[warn(clippy::useless_format)]` implied by `#[warn(clippy::all)]`

warning: constant `RESERVED_IDENTS` is never used
  --> src/lang/js_ts/reserved_terms.rs:66:18
   |
66 | pub(crate) const RESERVED_IDENTS: &[&str] = &[
   |                  ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default