[llvm-bugs] [Bug 51443] New: libc++ std::span implementation missing constructor overload for iterator and sentinel

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51443

            Bug ID: 51443
           Summary: libc++ std::span implementation missing constructor
                    overload for iterator and sentinel
           Product: libc++
           Version: 12.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: enolan at alumni.cmu.edu
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

The constructor taking an iterator/sentinel seems to be missing from libc++'s
implementation of std::span.

Prototype:

template<class It, class End>
  constexpr explicit(extent != dynamic_extent) span(It first, End last);

Standard link (section 22.7.3.2):

http://eel.is/c++draft/views#lib:span,constructor__

Example:

#include <span>
#include <string>

void foo() {
    std::string str{};
    std::span bar{str.begin(), str.end()};
}

The above code fails to compile on Clang 12.0.1 with -std=c++20 -stdlib=libc++,
but is accepted with -stdlib=libstdc++.

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