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P0088R3_variant: Investigate possible Clang bugs

testRelated to test codeRelated to test code

Status: Open.

#6156 In microsoft/STL;

· StephanTLavavej opened on Mar 12, 2026

P1004R2_constexpr_vector: Report MSVC constexpr error affecting std::construct_at array support

compilerCompiler work involvedCompiler work involved

testRelated to test codeRelated to test code

Status: Open.

#6155 In microsoft/STL;

· StephanTLavavej opened on Mar 12, 2026

<cmath>: Special Math ellint_2() produces wrong result when angle is close to 2 * pi

bugSomething isn't workingSomething isn't working

externalThis issue is unrelated to the STLThis issue is unrelated to the STL

Status: Open.

#6152 In microsoft/STL;

· StephanTLavavej opened on Mar 10, 2026

<utility>: unreachable does not abort in debug builds

enhancementSomething can be improvedSomething can be improved

Status: Open.

#6151 In microsoft/STL;

· K-ballo opened on Mar 10, 2026

<locale>: Calling use_facet<collate<char>>(loc) changes output of strftime() in a different thread

bugSomething isn't workingSomething isn't working

Status: Open.

#6150 In microsoft/STL;

· StephanTLavavej opened on Mar 10, 2026

README.md: Document TESTS_BUILD_ONLY default on some targets

documentationRelated to documentation or commentsRelated to documentation or comments

Status: Open.

#6149 In microsoft/STL;

· AlexGuteniev opened on Mar 10, 2026

<xloctime>: time_put_byname doesn't encode the output in UTF-8 even if the locale name contains ".UTF-8"

bugSomething isn't workingSomething isn't working

Status: Open.

#6135 In microsoft/STL;

· cpplearner opened on Mar 3, 2026

<xloctime>: time_put::do_put does not match strftime for the %c and %r specifiers in the "C" locale

bugSomething isn't workingSomething isn't working

Status: Open.

#6134 In microsoft/STL;

· cpplearner opened on Mar 3, 2026

<xloctime>: time_get::do_get doesn't parse a literal %

bugSomething isn't workingSomething isn't working

Status: Open.

#6130 In microsoft/STL;

· cpplearner opened on Mar 2, 2026

<xloctime>: time_get::do_get uses the wrong format for %c and %x

bugSomething isn't workingSomething isn't working

Status: Open.

#6129 In microsoft/STL;

· cpplearner opened on Mar 2, 2026

<xloctime>: do_get_monthname and do_get_weekday do not set eofbit in some cases, but libcxx tests expect them to do

bugSomething isn't workingSomething isn't working

Status: Open.

#6128 In microsoft/STL;

· cpplearner opened on Mar 2, 2026

<ranges>: _Zip_iterator_sentinel_equal redefinition error (C2382) when mixing #include <ranges> with import std;

bugSomething isn't workingSomething isn't working

modulesC++23 modules, C++20 header unitsC++23 modules, C++20 header units

rangesC++20/23 rangesC++20/23 ranges

Status: Open.

#6121 In microsoft/STL;

· julixian opened on Feb 28, 2026