Results 3 issues of joaquintides

Starting with B2 5.0.0, building b2 with msvc-14.0 (toolset `vc14`) fails with: ``` LINK : fatal error LNK1158: cannot run 'mt.exe' ``` Full log [here](https://drone.cpp.al/boostorg/unordered/1109/55/2). Seemingly this is related to...

bug
norepro

Implement `lambda` described as follows: The _placeholder set_ of a type `T`, denoted PS(`T`), is defined as: * PS(`T`) = ∅ if `T` is a primitive type or a class...

As shown in [this CI job](https://github.com/boostorg/flyweight/actions/runs/10861565047/job/30143618327) from Boost.Flyweight: ``` 2024-09-14T10:12:05.5807995Z gcc.compile.c++ bin.v2\libs\flyweight\test\test_intermod_holder.test\gcc-8\debug\x86_64\cxxstd-14-iso\threadapi-win32\threading-multi\visibility-hidden\test_intermod_holder.o 2024-09-14T10:12:05.8093853Z gcc.compile.c++ bin.v2\libs\flyweight\test\test_no_locking.test\gcc-8\debug\x86_64\cxxstd-14-iso\threadapi-win32\threading-multi\visibility-hidden\test_no_locking_main.o 2024-09-14T10:12:08.2337843Z gcc.link bin.v2\libs\flyweight\test\test_intermod_holder.test\gcc-8\debug\x86_64\cxxstd-14-iso\threadapi-win32\threading-multi\visibility-hidden\test_intermod_holder.exe 2024-09-14T10:12:08.2709878Z testing.capture-output bin.v2\libs\flyweight\test\test_intermod_holder.test\gcc-8\debug\x86_64\cxxstd-14-iso\threadapi-win32\threading-multi\visibility-hidden\test_intermod_holder.run 2024-09-14T10:12:08.2711770Z ====== BEGIN OUTPUT ====== 2024-09-14T10:12:08.2720797Z libs/flyweight/test/test_intermod_holder.cpp(33): test 'str==intermodule_flyweight_string("boost")'...