DEBUGGING_MSVC_2015: -j 1 to not have interleaved error messages.

.github/workflows/ci.yml

@@ -755,8 +755,8 @@ jobs:
       fail-fast: false
       matrix:
         python:
-          - 2.7
-          - 3.6
+          #- 2.7
+          #- 3.6
           - 3.7
           # todo: check/cpptest does not support 3.8+ yet
 
@@ -789,7 +789,7 @@ jobs:
         -DDOWNLOAD_EIGEN=ON
 
     - name: Build C++14
-      run: cmake --build build -j 2
+      run: cmake --build build -j 1
 
     - name: Run all checks
       run: cmake --build build -t check

include/pybind11/cast.h

@@ -2520,7 +2520,7 @@ T cast(const handle &handle) {
     using namespace detail;
     static_assert(!cast_is_temporary_value_reference<T>::value,
             "Unable to cast type to reference: value is local to type caster");
-    return cast_op<T>(load_type<T>(handle));
+    return cast_op<T>(load_type<T>(handle)); // HEERE 2
 }
 
 // pytype -> pytype (calls converting constructor)
@@ -2575,7 +2575,7 @@ template <typename T> detail::enable_if_t<detail::move_if_unreferenced<T>::value
         return move<T>(std::move(object));
 }
 template <typename T> detail::enable_if_t<detail::move_never<T>::value, T> cast(object &&object) {
-    return cast<T>(object);
+    return cast<T>(object); // HERE 2
 }
 
 template <typename T> T object::cast() const & { return pybind11::cast<T>(*this); }
@@ -2605,7 +2605,7 @@ template <typename T> enable_if_t<!cast_is_temporary_value_reference<T>::value,
 // though if it's in dead code, so we provide a "trampoline" to pybind11::cast that only does anything in
 // cases where pybind11::cast is valid.
 template <typename T> enable_if_t<!cast_is_temporary_value_reference<T>::value, T> cast_safe(object &&o) {
-    return pybind11::cast<T>(std::move(o)); }
+    return pybind11::cast<T>(std::move(o)); } // HEERE 1
 template <typename T> enable_if_t<cast_is_temporary_value_reference<T>::value, T> cast_safe(object &&) {
     pybind11_fail("Internal error: cast_safe fallback invoked"); }
 template <> inline void cast_safe<void>(object &&) {}

tests/test_virtual_functions.cpp

@@ -78,7 +78,7 @@ public:
     // We can return reference types for compatibility with C++ virtual interfaces that do so, but
     // note they have some significant limitations (see the documentation).
     const std::string &get_string1() override {
-        PYBIND11_OVERRIDE(
+        PYBIND11_OVERRIDE( // HEERE 0
             const std::string &, /* Return type */
             ExampleVirt,         /* Parent class */
             get_string1,         /* Name of function */