[Sema] Disable built-in increment operator for bool in overload resolution in C++17

Following: https://llvm.org/svn/llvm-project/cfe/trunk@329804

For C++17 the wording of [over.built] p4 excluded bool:

For every pair (T , vq), where T is an arithmetic type other than bool, there exist
candidate operator functions of the form
  vq T & operator++(vq T &);
  T operator++(vq T &, int);

Differential Revision: https://reviews.llvm.org/D45569

llvm-svn: 330254

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/overloaded-builtin-operators-cxx17.cpp b/clang/test/SemaCXX/overloaded-builtin-operators-cxx17.cpp
new file mode 100644
index 00000000000..05f85f88ccd
--- /dev/null
+++ b/clang/test/SemaCXX/overloaded-builtin-operators-cxx17.cpp
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -fshow-overloads=best -verify -triple x86_64-linux-gnu -std=c++17 %s
+
+struct BoolRef {
+  operator bool&();
+};
+
+void foo(BoolRef br) {
+  // C++ [over.built]p3: Increment for bool was removed in C++17.
+  bool b = br++; // expected-error{{cannot increment value of type 'BoolRef'}}
+}
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