diff --git a/src/lib.rs b/src/lib.rs
index 8c7bae0c886..5f8d00bb455 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@
  * TODO(antoyo): support LTO (gcc's equivalent to Full LTO is -flto -flto-partition=one — https://documentation.suse.com/sbp/all/html/SBP-GCC-10/index.html).
  * For Thin LTO, this might be helpful:
  * In gcc 4.6 -fwhopr was removed and became default with -flto. The non-whopr path can still be executed via -flto-partition=none.
+ * Or the new incremental LTO?
  *
  * Maybe some missing optizations enabled by rustc's LTO is in there: https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
  * Like -fipa-icf (should be already enabled) and maybe -fdevirtualize-at-ltrans.
@@ -29,6 +30,7 @@
 #![warn(unused_lifetimes)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
+#![deny(clippy::pattern_type_mismatch)]
 
 extern crate rustc_apfloat;
 extern crate rustc_ast;