[Motions 2026 03 lwg 2] P4146R0 C++ Standard Library Immediate Issues#8935

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burblebee wants to merge 37 commits intomainfrom

motions-2026-03-lwg-2

Commits on Apr 12, 2026

LWG3662 basic_string::append/assign(NTBS, pos, n) suboptimal

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LWG3777 Common cartesian_product_view produces an invalid range if the first range is input and one of the ranges is empty

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LWG3797 elements_view insufficiently constrained

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LWG3891 LWG 3870 breaks std::expected<cv T, E>

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LWG4026 Assignment operators of std::expected should propagate triviality

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LWG4122 Ill-formed operator<=> can cause hard error when instantiating std::inplace_vector

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LWG4133 awaitable-receiver's members are potentially throwing

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LWG4143 execution::set_value/set_error/set_stopped/start should always return void

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Commits on Apr 13, 2026

LWG4151 Precondition of inplace_vector::swap

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LWG4223 Deduction guides for maps are mishandling tuples and references

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LWG4314 Missing move in mdspan layout mapping::operator()

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LWG4325 std::indirect's operator== still does not support incomplete types

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LWG4339 task's coroutine frame may be released late

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LWG4347 task's stop source is always created

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LWG4354 Reconsider weakly_parallel as the default forward_progress_guarantee

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LWG4361 awaitable-receiver::set_value should use Mandates instead of constraints

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LWG4379 hive::reserve() needs Throws: element adjusted to match block min/max considerations

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LWG4476 run_loop should not have a set_error completion

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LWG4478 meta::has_identifier is not specified for annotations

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LWG4485 Move specification for task::stop_token_type

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LWG4497 std::nullopt_t should be comparable

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LWG4504 Wording problem in {simple_}counting_scope

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LWG4506 source_location is explicitly unspecified if is constexpr or not

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LWG4532 Imprecise std::polymorphic wording seems to imply slicing

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LWG4533 not_fn<f> is unimplementable

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LWG4537 Improve define_static_array

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LWG4540 future-senders returned from spawn_future do not forward stop requests to spawned work

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LWG4544 Parallel overload of ranges::set_difference should return in_in_out_result

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LWG4548 Parallel ranges::set_intersection should not do unnecessary work

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LWG4549 vprint_nonunicode_buffered ignores its stream parameter

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LWG4550 Need new feature test macros for <stdckdint.h> and <stdbit.h>

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LWG4552 compare_exchange_weak writes a value on spurious failure, not memory contents

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LWG4553 Wording for FR-025-246 25.7.18.2 Add a reserve_hint function to concat_view

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LWG4554 Remove undefined behaviour from hive for invalid limits

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LWG4555 Remove is_consteval_only

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LWG4556 Unclear properties of reflection strings

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LWG4557 Remove constexpr from owner_less and owner_before

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