<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/61333>61333</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lldb 14: "p std::string("o", std::allocator<char>())" works on "-std=gnu++14", but doesn't work on "-std=gnu++20"
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          safinaskar
      </td>
    </tr>
</table>

<pre>
    In lldb 14 `p std::string("o", std::allocator<char>())` works on `-std=gnu++14`, but doesn't work on `-std=gnu++20`.

Here is code:
```c++
#include <stdio.h>
#include <string>
int main() {
  std::string a("x");
 std::string b("x", std::allocator<char> ());
  printf ("");
}
```

Here is output with `-std=gnu++14`:
```text
(lldb) p std::string("o", std::allocator<char>())
(std::string) $0 = "o"
```

And here is output with `-std=gnu++20`:
```text
(lldb) p std::string("o", std::allocator<char>())
error: expression failed to parse:
error: <user expression 0>:1:1: no matching constructor for initialization of 'std::string' (aka 'std::basic_string<char, std::char_traits<char>, std::allocator<char>>')
std::string("o", std::allocator<char>())
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: candidate constructor not viable: no known conversion from 'const char[2]' to 'std::basic_string<char, std::char_traits<char>, std::allocator<char>>' for 1st argument

note: candidate constructor not viable: no known conversion from 'const char[2]' to 'const std::basic_string<char, std::char_traits<char>, std::allocator<char>>' for 1st argument

note: candidate constructor not viable: no known conversion from 'const char[2]' to 'std::initializer_list<char>' for 1st argument

note: candidate constructor not viable: no known conversion from 'const char[2]' to 'std::basic_string<char, std::char_traits<char>, std::allocator<char>>::__sv_wrapper' for 1st argument

note: candidate constructor not viable: requires 1 argument, but 2 were provided

note: candidate constructor not viable: requires 1 argument, but 2 were provided

note: candidate constructor not viable: requires 1 argument, but 2 were provided

note: candidate constructor not viable: requires 3 arguments, but 2 were provided

note: candidate constructor not viable: requires 3 arguments, but 2 were provided

note: candidate constructor not viable: requires 3 arguments, but 2 were provided

note: candidate constructor not viable: requires 0 arguments, but 2 were provided

note: candidate constructor not viable: requires 4 arguments, but 2 were provided
```

`p std::string("o")` doesn't work at all with both standards.

Here is full dockerfile for reproducing:
```dockerfile
# Reproducible
# 20230227 = 20230227T000000Z = 20230226T090712Z
FROM debian:sid-20230227
ENV LC_ALL C.UTF-8

# Following two lines help us achieve full reproducibility
RUN sed  -i 's~^URIs:.*$~URIs: http://snapshot.notset.fr/archive/debian/20230226T090712Z~' /etc/apt/sources.list.d/debian.sources
RUN echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/02acquire-check-valid-until

RUN apt-get update && apt-get install -y --no-install-recommends apt-utils whiptail
RUN apt-get update && apt-get install -y --no-install-recommends less mc aptitude man-db
RUN apt-get update && apt-get install -y --no-install-recommends clang lldb
RUN echo '#include <stdio.h>' >> a.cpp
RUN echo '#include <string>' >> a.cpp
RUN echo 'int main() {' >> a.cpp
RUN echo ' std::string a("x");' >> a.cpp
RUN echo '  std::string b("x", std::allocator<char> ());' >> a.cpp
RUN echo '  printf ("");' >> a.cpp
RUN echo '}' >> a.cpp
RUN clang++ -fno-limit-debug-info -std=gnu++14                 -g -o a a.cpp
RUN lldb ./a -o 'br set --file a.cpp --source-pattern printf' -o 'r' -o 'p std::string("o", std::allocator<char>())' < /dev/null
RUN lldb ./a -o 'br set --file a.cpp --source-pattern printf' -o 'r' -o 'p std::string("o")' < /dev/null
RUN clang++ -fno-limit-debug-info -std=gnu++20                 -g -o a a.cpp
RUN lldb ./a -o 'br set --file a.cpp --source-pattern printf' -o 'r' -o 'p std::string("o", std::allocator<char>())' < /dev/null
RUN lldb ./a -o 'br set --file a.cpp --source-pattern printf' -o 'r' -o 'p std::string("o")' < /dev/null
```

Here is full output: https://paste.debian.net/1273635/

Also: as you can see, I see `ModuleNotFoundError: No module named 'lldb.embedded_interpreter'` messages. I don't know whether this is related. I reported that error here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1032423
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWE1v2zwS_jX0ZSBBpuSPHHxw4hhboG8XKNr38F4CShxZ3FCklhzZ7R762xekbMdxkroLuN0FtobbWJovPg-H0swI79XGIC7Y5JZNViPRU2PdwotaGeEfhRuVVn5dvDOgtSxhXACbZh14kixfsnzpySmzYXzOOLeMc8bvnoRCa1sJso7ld1UjHMvvo-ZN-E4z2Fn36MGa4DOJVquN6Rm_Zfx2XLBpFryVPYG06A3jM4omb1jwjE2zlGUrli2H__-GDkF5qKzEsKJBNM2GbzWY7e_yXJlK9xKB5XeepLJpE9b7qjRiPgiVIWiFMgM0YLO9SzhnCcTA05fI0w3LD4rneuWp3vf5hCdCj-6gc8pQPYj4WTA2W53x8BpjtqeuJ9gpat7enBeMEn6hA2HzkC-Bj6sky8HpC1c3wHiRActXcHD6NrqlkdD8GMKYTL8cIToXpEvAL51D75U1UAulUQJZ6ITzT3l81GX5Xe_RndpkwXW-HO__gbHQCqqakFyVNZ5cX5F1UFsHyihSQqt_CQqmNuTN7AWgWcgm8SieCUvhVfVwOA4DplPA4cYDOaHIn0K-QElQmR0puVryTO7h29ufQclYCgRDJYxUUhA-Y8tYgq0SpcY9p4_G7kxQ2aIb9srZNjAUrSAuZHLL2WQVCCT7q8iL-zr2BMJt-hYNnR6CX4BxEP0_ID2u8HiK0D1o5ekUyP_OKn_aTkTZw4PfPuyc6Dp010Tt8J-9cuhh_ORqXxhw2IXneefsVkmUvyOgh_wYwf8O8b0Q2c8PUfxoiNfKlUuVdqyhz0pjQSC0Hsqa0lIDnoSRwkn_amVc91qDtNUjulppjEfWYees7Kv4jDgvgJ50j5UxfDwYlKd3ecbzjIfCIV8dLz5l8fPX6c3pp-wmm435X4Pt-uPf_wCJpRImoFYyORgP8vsPf8L7u4fl-_dwl37-tE7mzzjjOayt1nYXah3aWdDKoIcGdQe9B1E1Crc4AD8iLZVW9HXw8PHzB_AoARIVn53f2OT-88d3nuXLlPEl48W3_SU0RF2giK8ZX3sjOt9YSo0lj5TWjvG1cFWjtsj4eo-Ir89RfxuKqzVSFQw6Cr5s7yr0aXiTpPJone7vPy0UqyY-4ZdVTLghU-4arB6TP4VWMvlsSOlQGtdCewxpk9_GgLF1eBZUdJRW1tQxYMbF4DKpordt9NYHb6d0hzWIjpINEvRdPBWMTxmfHu8q4ylkZPIVksTYZH-dOKxs26KRPqr2pLSHXaM6EocQV3Gu0Xtoq2CiKDRwrTCJLK8YodLCbGJ7_HJf3mwrhy0IuyDSqusuWx5azouGr7SjF21-oFO97ON6bewPxHqjxb1M62z1tlLcyaH_g6Q2NtGqVZRILPtNokxt4WUjDOefZAOJBXHuO45P0nDMgpjxWenAI0GSxAdv1IYkGU540gkidGYPM6x4MHJPP6_SdUYq7iA-YbaMr02v9X9rzZdW85_vDs9-786v2J3vjpLim3aYthzemf740uyEJ0z3bzeD4TU05rN8mk-C_HR0o70N5sLDV9uHIgw8YqDyXfgBbJr9YWWv8YOlte2NvD-MRz5YaKMEjGhRBqCBuRTbEqVE-aAMoescUuxaQk3Vovdigz6FdyDtUF2Fvgt2DVKDDqhRPmBzqAWhDHoOO-sIJVAjCOJwJs6aXmIu-40_QLZuw_i62qikDE_sIBscpdVGsTxcs3w1znJe8HwkF7m8yW_ECBfj6WxezIpxNh81C46TyaQsZF1P5UTIGzGdzOWsmBecT7GeiJFaxKojH2fjeTHn8zTnoi6zyUxKmVVFUbMiw1YonWq9bcOqRsr7HhfTcZ7nIy1K1D6OiDk3uIMoDGkxWY3cItgkARUrslCx-CcvpEjjYj86jsMqzq9zNPjJ9JjzVwaUg7c3pscvLXjGOB_1Ti-e79ZGUdOXaWVbxtcB1_5P0jn7D6xCxkY2POPryNa_AwAA__9n_hQS">