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P2278R4_views_as_const: Clang 22 emits error: satisfaction of constraint '__is_constructible(_Ty, _ArgTys...)' depends on itself

compilerCompiler work involvedCompiler work involved

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

Status: Open.

#6295 In microsoft/STL;

· StephanTLavavej opened on May 20, 2026

<xutility>: std::find no longer compiles with structs with defaulted equality comparison with Clang-CL

bugSomething isn't workingSomething isn't working

Status: Open.

#6294 In microsoft/STL;

· mgovers opened on May 20, 2026

<optional> ASan annotations cause false-positive use-after-poison crashes in valid user code at clang-cl -O2

ASanAddress SanitizerAddress Sanitizer

compilerCompiler work involvedCompiler work involved

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

Status: Open.

#6291 In microsoft/STL;

· rvandermeulen opened on May 19, 2026

<filesystem>: weakly_canonical fails with ERROR_ACCESS_DENIED inside Windows AppContainer

bugSomething isn't workingSomething isn't working

filesystemC++17 filesystemC++17 filesystem

Status: Open.

#6286 In microsoft/STL;

· bsosnader opened on May 14, 2026

<chrono>/<format>: Using milliseconds::max() triggers icx' UBSan

chronoC++20 chronoC++20 chrono

formatC++20/23 formatC++20/23 format

LWG issue neededA wording defect that should be submitted to LWG as a new issueA wording defect that should be submitted to LWG as a new issue

Status: Open.

#6277 In microsoft/STL;

· bersbersbers opened on May 8, 2026

ASan STL string and vector annotations leave poisoning behind

ASanAddress SanitizerAddress Sanitizer

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#6276 In microsoft/STL;

· amyw-msft opened on May 7, 2026

Classes that use [[no_unique_address]] may have different layout depending on compiler used

bugSomething isn't workingSomething isn't working

compilerCompiler work involvedCompiler work involved

high priorityImportant!Important!

Status: Open.

#6253 In microsoft/STL;

· JMazurkiewicz opened on Apr 14, 2026

P3725R3 Filter View Extensions For Safer Use

cxx20C++20 featureC++20 feature

defect reportApplied retroactivelyApplied retroactively

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

Status: Open.

#6242 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P3059R2 Making User-Defined Constructors Of View Iterators/Sentinels private

cxx20C++20 featureC++20 feature

defect reportApplied retroactivelyApplied retroactively

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

Status: Open.

#6241 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P4037R1 Supporting signed char And unsigned char In <random>

cxx26C++26 featureC++26 feature

defect reportApplied retroactivelyApplied retroactively

Status: Open.

#6240 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

LWG-4293 span::subspan/first/last chooses wrong constructor when T is const-qualified bool

LWGLibrary Working Group issueLibrary Working Group issue

Status: Open.

#6239 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P0896R4_views_elements: The test isn't compatible with TEST_EVERYTHING

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

testRelated to test codeRelated to test code

Status: Open.

#6237 In microsoft/STL;

· frederick-vs-ja opened on Apr 8, 2026