Merge pull request #758 from dtolnay/clang-tidy-11

Update to clang-tidy 11

Author: dtolnay

.clang-tidy

@@ -10,6 +10,7 @@ Checks:
   -cppcoreguidelines-pro-type-const-cast,
   -cppcoreguidelines-pro-type-member-init,
   -cppcoreguidelines-pro-type-reinterpret-cast,
+  -cppcoreguidelines-pro-type-vararg,
   -cppcoreguidelines-special-member-functions,
   -modernize-use-default-member-init,
   -modernize-use-equals-default,

.github/workflows/ci.yml

@@ -107,6 +107,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Install clang-tidy
-        run: sudo apt-get install clang-tidy-10
+        run: sudo apt-get install clang-tidy-11
       - name: Run clang-tidy
-        run: clang-tidy-10 src/cxx.cc --warnings-as-errors=*
+        run: clang-tidy-11 src/cxx.cc --warnings-as-errors=*