[Draft] Add direct_method_call lint

CHANGELOG.md

@@ -3966,6 +3966,7 @@ Released 2018-09-13
 [`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
 [`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord
 [`derive_partial_eq_without_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq
+[`direct_method_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#direct_method_call
 [`disallowed_macros`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_macros
 [`disallowed_method`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_method
 [`disallowed_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_methods
@@ -4451,6 +4452,7 @@ Released 2018-09-13
 [`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
 [`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation
 [`unnecessary_owned_empty_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_owned_empty_strings
+[`unnecessary_safety_comment`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_safety_comment
 [`unnecessary_safety_doc`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_safety_doc
 [`unnecessary_self_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_self_imports
 [`unnecessary_sort_by`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by

book/src/SUMMARY.md

@@ -21,3 +21,4 @@
         - [The Clippy Book](development/infrastructure/book.md)
     - [Proposals](development/proposals/README.md)
         - [Roadmap 2021](development/proposals/roadmap-2021.md)
+        - [Syntax Tree Patterns](development/proposals/syntax-tree-patterns.md)