Ignore let_underscore_drop pedantic clippy lint

Author: dtolnay

serde/src/lib.rs

@@ -120,6 +120,7 @@
         zero_prefixed_literal,
         // correctly used
         enum_glob_use,
+        let_underscore_drop,
         map_err_ignore,
         result_unit_err,
         wildcard_imports,

serde_derive/src/lib.rs

@@ -38,6 +38,7 @@
     clippy::filter_map,
     clippy::indexing_slicing,
     clippy::items_after_statements,
+    clippy::let_underscore_drop,
     clippy::map_err_ignore,
     clippy::match_same_arms,
     clippy::module_name_repetitions,

serde_derive_internals/lib.rs

@@ -18,6 +18,7 @@
     clippy::doc_markdown,
     clippy::enum_glob_use,
     clippy::items_after_statements,
+    clippy::let_underscore_drop,
     clippy::match_same_arms,
     clippy::missing_errors_doc,
     clippy::module_name_repetitions,