test UBSan

Author: johnmcfarlane

.github/workflows/test.yml

@@ -39,6 +39,7 @@ jobs:
   # Build and test latest on Linux using only CMake
   cmake:
     strategy:
+      fail-fast: false
       matrix:
         compiler: [clang, gcc]
         include:
@@ -105,6 +106,7 @@ jobs:
   # Build and test many combinations on Linux/OS X using Conan
   conan:
     strategy:
+      fail-fast: false
       matrix:
         name: [
           clang-head-libc++, clang-head-libstdc++,
@@ -242,6 +244,7 @@ jobs:
   windows:
     runs-on: windows-2019
     strategy:
+      fail-fast: false
       matrix:
         arch: [x86_64, x86]
         include:

test/unit/overflow/overflow_int.cpp

@@ -514,11 +514,9 @@ namespace test_used_digits {
 namespace {
     TEST(overflow_integer, pre_increment)  // NOLINT
     {
-        auto a = cnl::overflow_integer<>{INT_MAX - 1};
+        auto a = INT_MAX;
         auto& b = ++a;
-        static_assert(
-                std::is_same<decltype(b), cnl::overflow_integer<>&>::value,
-                "static_integer pre-increment return value");
+        --a;
         ASSERT_EQ(&b, &a) << "static_integer pre-increment return address";
         ASSERT_EQ(INT_MAX, b) << "static_integer pre-increment";
     }