[clang] Error on explicit specialization of lambda call operator (#84343)

Fixes https://github.com/llvm/llvm-project/issues/83267

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/lambda-expressions.cpp b/clang/test/SemaCXX/lambda-expressions.cpp
index 41cf5a4..0516a5d 100644
--- a/clang/test/SemaCXX/lambda-expressions.cpp
+++ b/clang/test/SemaCXX/lambda-expressions.cpp
@@ -732,3 +732,18 @@ void GH67492() {
   constexpr auto test = 42;
   auto lambda = (test, []() noexcept(true) {});
 }
+
+namespace GH83267 {
+auto l = [](auto a) { return 1; };
+using type = decltype(l);
+
+template<>
+auto type::operator()(int a) const { // expected-error{{lambda call operator should not be explicitly specialized or instantiated}}
+  return c; // expected-error {{use of undeclared identifier 'c'}}
+}
+
+auto ll = [](auto a) { return 1; }; // expected-error{{lambda call operator should not be explicitly specialized or instantiated}}
+using t = decltype(ll);
+template auto t::operator()<int>(int a) const; // expected-note {{in instantiation}}
+
+}