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<code>&lt;flat_map&gt;</code>: Missing test coverage

flat_meowC++23 container adaptorsC++23 container adaptors

testRelated to test codeRelated to test code

Status: Open.

#6045 In microsoft/STL;

· StephanTLavavej opened on Jan 23, 2026

<code>&lt;fstream&gt;</code>: initialize fstream with FILE* lead to resource leak

Status: Open.

#6041 In microsoft/STL;

· coderall2 opened on Jan 23, 2026

Test: Clarify "non-standard extension"

Status: Open.

#6037 In microsoft/STL;

· frederick-vs-ja opened on Jan 22, 2026

<code>&lt;algorithm&gt;</code>: std::uninitialized_copy used memmove instead of memcpy

performanceMust go fasterMust go faster

Status: Open.

#6029 In microsoft/STL;

· TymianekPL opened on Jan 20, 2026

<code>&lt;regex&gt;</code>: Remove nodes for capturing group 0 from the NFA

performanceMust go fasterMust go faster

regexmeow is a substring of homeownermeow is a substring of homeowner

vNextBreaks binary compatibilityBreaks binary compatibility

Status: Open.

#6025 In microsoft/STL;

· muellerj2 opened on Jan 18, 2026

ARM64EC vector algorithms

questionFurther information is requestedFurther information is requested

Status: Open.

#5998 In microsoft/STL;

· AlexGuteniev opened on Jan 7, 2026

Test: On <code>.compile.fail.cpp</code> in the libcxx test suite

questionFurther information is requestedFurther information is requested

testRelated to test codeRelated to test code

Status: Open.

#5981 In microsoft/STL;

· frederick-vs-ja opened on Dec 29, 2025

Add a Clang-specific diagnostic ignore push-pop for <code>module std;</code>

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

Status: Open.

#5975 In microsoft/STL;

· sharadhr opened on Dec 26, 2025

<code>&lt;optional&gt;</code>: address sanitizer annotation

ASanAddress SanitizerAddress Sanitizer

enhancementSomething can be improvedSomething can be improved

Status: Open.

#5974 In microsoft/STL;

· AlexGuteniev opened on Dec 22, 2025

<code>&lt;regex&gt;</code>: Consider special-casing some simple loop structures

performanceMust go fasterMust go faster

regexmeow is a substring of homeownermeow is a substring of homeowner

Status: Open.

#5971 In microsoft/STL;

· muellerj2 opened on Dec 21, 2025

<code>&lt;regex&gt;</code>: Avoid heap allocations for few capturing groups and stack frames

performanceMust go fasterMust go faster

regexmeow is a substring of homeownermeow is a substring of homeowner

Status: Open.

#5969 In microsoft/STL;

· muellerj2 opened on Dec 19, 2025

<code>&lt;regex&gt;</code>: Avoid generating no-op NFA nodes

performanceMust go fasterMust go faster

regexmeow is a substring of homeownermeow is a substring of homeowner

Status: Open.

#5962 In microsoft/STL;

· muellerj2 opened on Dec 14, 2025