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[stopcallback.inplace.general] declares `using callback_type = CallbackFn;` as a public member of `inplace_stop_callback`. stdexec did not provide it, so `inplace_stop_callback<F>::callback_type` failed to compile. Add the alias and a test.
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The standard declares a public member type alias in
inplace_stop_callback(stopcallback.inplace.general):using callback_type = CallbackFn;stdexec did not declare it, so
inplace_stop_callback<F>::callback_typefailed to compile (MSVC: "error C2039: 'callback_type': is not a member of 'std::inplace_stop_callback<...>'").This adds the alias at the top of the class, plus a test in
test_concepts_stop_tokens.cppthat checks it names the callback type.Tested locally with MSVC 14.44 (Debug): the new test fails to compile without the fix and passes with it, and the rest of
test.stdexecpasses too (test_any.cppwas left out of the local build because this MSVC version hits an internal compiler error on it, on main as well). clang-format 21 reports no changes on the touched files.