void foo() { bool a = true; // recommends adding const auto b = true; // no diagnostic emitted }

When declaring a local variable with auto, misc-const-correctness will never recommend adding const. I've tried this for built-in types as well as user-defined types and can't under any circumstances get it to recommend adding const to an auto type.

I was able to observe this with clang-tidy v15.0.7 as distributed by Homebrew.

EDIT: See https://reviews.llvm.org/D145856