try to get compile-failure tests working

CMakeLists.txt

@@ -92,6 +92,16 @@ rapids_cpm_find(Catch2 ${Catch2_VERSION}
     URL https://github.com/catchorg/Catch2/archive/refs/tags/v${Catch2_VERSION}.zip
 )
 
+# Add ICM
+set(icm_VERSION 1.5.0)
+# Always download it, don't attempt to do `find_package(ICM)` first
+set(CPM_DOWNLOAD_icm TRUE)
+rapids_cpm_find(icm ${icm_VERSION}
+  CPM_ARGS
+    URL https://github.com/iboB/icm/archive/refs/tags/v${icm_VERSION}.zip
+    PATCH_COMMAND patch -p 1 -i ${CMAKE_CURRENT_SOURCE_DIR}/cmake/cpm/patches/icm/regex-build-error.diff
+)
+
 # Ensure that we link with the threading library
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 rapids_find_package(Threads REQUIRED

cmake/cpm/patches/icm/regex-build-error.diff

@@ -0,0 +1,28 @@
+diff --git a/icm_build_failure_parse_and_run.cmake b/icm_build_failure_parse_and_run.cmake
+index 0e62f6c..2ea5f0a 100644
+--- a/icm_build_failure_parse_and_run.cmake
++++ b/icm_build_failure_parse_and_run.cmake
+@@ -29,14 +29,15 @@ endif()
+
+ # collect possible errors from source
+ file(READ "@parsedSourcePath@" sourceText)
++
+ string(REGEX MATCHALL "//[ ]*build error:[^\n]+" matchErrors ${sourceText})
+
+ # look for collected errors in output
+ foreach(possibleError ${matchErrors})
+     string(REGEX MATCH "//[ ]*build error:[ \t]*(.+)$" _ "${possibleError}")
+     set(possibleError "${CMAKE_MATCH_1}")
+-    string(FIND "${out}" "${possibleError}" pos)
+-    if(NOT pos EQUAL -1)
++    string(REGEX MATCH "${possibleError}" actualError "${out}")
++    if(NOT "${actualError}" STREQUAL "")
+         message("Success: output when building '@ARG_TARGET@' contains '${possibleError}'")
+         return()
+     endif()
+@@ -48,4 +49,4 @@ endforeach()
+ # print execute_process output for debugging purposes
+ message("${out}")
+ # print error
+-message(FATAL_ERROR "Error: Building '@ARG_TARGET@' failed, but output doesn't contain any of the expected errors:${outErrors}")
++message(FATAL_ERROR "Error: Building '@ARG_TARGET@' failed, but output doesn't match the expected errors:${outErrors}")

test/CMakeLists.txt

@@ -117,3 +117,25 @@ catch_discover_tests(test.scratch)
 if(STDEXEC_ENABLE_CUDA)
     add_subdirectory(nvexec)
 endif()
+
+# build failure tests:
+
+include(${icm_SOURCE_DIR}/icm_build_failure_testing.cmake)
+
+# Test which parses a source file for an expected error message
+icm_add_build_failure_test(
+    NAME test_then_fail1
+    TARGET test_then_fail1
+    SOURCES PARSE stdexec/algos/adaptors/test_then_fail1.cpp
+    LIBRARIES stdexec
+    FOLDER test
+)
+
+
+# # Adding multiple tests with a glob
+# icm_glob_build_failure_tests(
+#     PATTERN *_fail*.cpp
+#     LIBRARIES stdexec
+#     PREFIX stdexec
+#     FOLDER test/stdexec/algos/adaptors
+# )

test/stdexec/algos/adaptors/test_then_fail1.cpp

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2023 NVIDIA Corporation
+ *
+ * Licensed under the Apache License Version 2.0 with LLVM Exceptions
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *   https://llvm.org/LICENSE.txt
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdexec/execution.hpp>
+
+namespace ex = stdexec;
+
+int main() {
+  ex::sender auto snd = ex::just(42) | ex::then([](int*){});
+  // build error: _NOT_CALLABLE_.*_WITH_FUNCTION_.*_WITH_ARGUMENTS_<int>
+  stdexec::sync_wait(std::move(snd));
+}