<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/68070>68070</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            ICE in forward from deduced this in lambda
        </td>
    </tr>

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

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

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

<pre>
    Huge thanks for landing P0847R7 in clang.

This short snippet crashes clang built from f58d54ab969b2f342a882dfb03334f18f4ec1dcc

```C++
#include <utility>

auto f = [x = 3]<typename Self>(this Self&& self)
  {
 return std::forward_like<Self>(x);
  };

int main()
{
 return std::move(f)();
}
```

```
bf@pteranodon /tmp > /opt/llvm-p0847r7/bin/clang++ -std=c++2c /tmp/t.cpp -stdlib=libc++
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/llvm-p0847r7/bin/clang-18 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name t.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/tmp -fcoverage-compilation-dir=/tmp -resource-dir /opt/llvm-p0847r7/lib/clang/18 -internal-isystem /opt/llvm-p0847r7/bin/../include/x86_64-unknown-linux-gnu/c++/v1 -internal-isystem /opt/llvm-p0847r7/bin/../include/c++/v1 -internal-isystem /opt/llvm-p0847r7/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++2c -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fno-implicit-modules -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/t-442d5d.o -x c++ /tmp/t.cpp
1.      <eof> parser at end of file
2.      /tmp/t.cpp:8:5: LLVM IR generation of declaration 'main'
3.      /tmp/t.cpp:8:5: Generating code for declaration 'main'
 #0 0x0000558ec0661ef2 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/llvm-p0847r7/bin/clang-18+0x3621ef2)
 #1 0x0000558ec065f37b SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f5494e3c4b0 (/lib/x86_64-linux-gnu/libc.so.6+0x3c4b0)
 #3 0x0000558ec359a919 (anonymous namespace)::LValueExprEvaluator::VisitVarDecl(clang::Expr const*, clang::VarDecl const*) ExprConstant.cpp:0:0
 #4 0x0000558ec35d9bf8 (anonymous namespace)::IntExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
 #5 0x0000558ec35920a0 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
 #6 0x0000558ec35ab61d EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) ExprConstant.cpp:0:0
 #7 0x0000558ec35aaaaf EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) ExprConstant.cpp:0:0
 #8 0x0000558ec35b2a38 HandleFunctionCall(clang::SourceLocation, clang::FunctionDecl const*, (anonymous namespace)::LValue const*, clang::Expr const*, llvm::ArrayRef<clang::Expr const*>, (anonymous namespace)::CallRef, clang::Stmt const*, (anonymous namespace)::EvalInfo&, clang::APValue&, (anonymous namespace)::LValue const*) (.isra.0) ExprConstant.cpp:0:0
 #9 0x0000558ec35e056f (anonymous namespace)::IntExprEvaluator::VisitCallExpr(clang::CallExpr const*) ExprConstant.cpp:0:0
#10 0x0000558ec35920a0 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#11 0x0000558ec359b478 EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#12 0x0000558ec359cdc9 clang::Expr::EvaluateAsRValue(clang::Expr::EvalResult&, clang::ASTContext const&, bool) const (/opt/llvm-p0847r7/bin/clang-18+0x655cdc9)
#13 0x0000558ec359cf26 clang::Expr::isEvaluatable(clang::ASTContext const&, clang::Expr::SideEffectsKind) const (/opt/llvm-p0847r7/bin/clang-18+0x655cf26)
#14 0x0000558ec0932f5d clang::CodeGen::CodeGenFunction::EmitReturnStmt(clang::ReturnStmt const&) (/opt/llvm-p0847r7/bin/clang-18+0x38f2f5d)
#15 0x0000558ec0940629 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/llvm-p0847r7/bin/clang-18+0x3900629)
#16 0x0000558ec099979b clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/llvm-p0847r7/bin/clang-18+0x395979b)
#17 0x0000558ec09ab3d5 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/llvm-p0847r7/bin/clang-18+0x396b3d5)
#18 0x0000558ec09f4b9a clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/llvm-p0847r7/bin/clang-18+0x39b4b9a)
#19 0x0000558ec09f0b6c clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/llvm-p0847r7/bin/clang-18+0x39b0b6c)
#20 0x0000558ec09f1263 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/llvm-p0847r7/bin/clang-18+0x39b1263)
#21 0x0000558ec09f7dd7 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#22 0x0000558ec180a238 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#23 0x0000558ec17fac77 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/llvm-p0847r7/bin/clang-18+0x47bac77)
#24 0x0000558ec2641304 clang::ParseAST(clang::Sema&, bool, bool) (/opt/llvm-p0847r7/bin/clang-18+0x5601304)
#25 0x0000558ec10e1a49 clang::FrontendAction::Execute() (/opt/llvm-p0847r7/bin/clang-18+0x40a1a49)
#26 0x0000558ec1065fb9 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/llvm-p0847r7/bin/clang-18+0x4025fb9)
#27 0x0000558ec11a581b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/llvm-p0847r7/bin/clang-18+0x416581b)
#28 0x0000558ebde1c481 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/llvm-p0847r7/bin/clang-18+0xddc481)
#29 0x0000558ebde14e0a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000558ebde18c91 clang_main(int, char**, llvm::ToolContext const&) (/opt/llvm-p0847r7/bin/clang-18+0xdd8c91)
#31 0x0000558ebdd1ab33 main (/opt/llvm-p0847r7/bin/clang-18+0xcdab33)
#32 0x00007f5494e23a90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#33 0x00007f5494e23b49 call_init ./csu/../csu/libc-start.c:128:20
#34 0x00007f5494e23b49 __libc_start_main ./csu/../csu/libc-start.c:347:5
#35 0x0000558ebde14285 _start (/opt/llvm-p0847r7/bin/clang-18+0xdd4285)
clang++: error: unable to execute command: Segmentation fault (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 18.0.0 (https://github.com/llvm/llvm-project f58d54ab969b2f342a882dfb03334f18f4ec1dcc)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/llvm-p0847r7/bin
clang++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/t-4a6752.cpp
clang++: note: diagnostic msg: /tmp/t-4a6752.sh
clang++: note: diagnostic msg: 

********************
```

The synonymous construction from a hand written type does not cause a crash.
```C++
#include <utility>

struct S
{
  int x = 3;
  template <typename Self>
  auto operator()(this Self&& self)
  {
    return std::forward_like<Self>(self.x);
  }
};


int main()
{
 S s;
  return std::move(s)();
}
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzcWl9vozqU_zT05YgIzJ_AQx_SpJmptnfvqOnOfayMbRLfMTayTaf99isbmgSaTpt2pV3tqBOBsc_5nePzD3ywMXwrGbsMsqsgW13gzu6UvtRKiIphfVEp-nz5vdsysDssfxmolQaBJeVyCz-iIp3fzYFLIALL7SyIVkG06H_vd9yA2SltwUjetswC0djsmOknQ9VxYaHWqoE6K2iW4qrMywrVSYpwUSBaV1GSJGkdF3XKSEwJOaYf5FH_twzQlfvrR1HCJREdZRAky85ywe1zkFwfr8SdVVBDkKwgyK6e_EUSZKsgWdrnlkncMNgwUbtlqLBODn-L8gDlYPxl2ZMCCOYDZ9DMdlqCsTRIFkGyqJX-jTV9EPwXC5LlgeKTW55cHSis9nf9L5cWGsxlgIo9p7f5NOqRBajwoPoFe2rz1URXJxXY31Z1kEatZRpLRZWEAK1t00KQXLtL1doArYV4bMLW7bqeB2hdOYhrv5v9HkDoUa1If4vIQMX9zkjb-ueCV0GyErwixxv34_Z6sbkG01UNt4Ch6ragWevMxyrYWdsaJy5aB2i95XbXVTOimgHTHppW_zLikHJjOmYCtAYsKbyYhN2x3gihwuSX1ZiwAC2h1azVijBjGAWjOt0Pu5XYGEU4toyC7iQYonlrBzvfWEx-Ae2a1iHzQ9EM_L8fWm01bgDrbdcwaR32j6gxjAsICYkhtJq3gsFTkT_kadjJX1L9lqHgsnsKt7KDkDXchqr6F8JGM4GfQiwEhA4N5RpwCCHlBleChbVmDEIiGNYhNjasWK00C50KmKSHeR7WI9O85kz7YYI1DR-x6FjovMJA6MwyrLnoB2DYVYdAEWy5kmGjKBPQcgJhy0ko2CMTgPobbsKWMwibWuOGha3i0jIdJCuPvW6w3YVMa6kgrOs2JEq6PbJBslISwlqqUKvOx57QzYWwIUoaqztilQ6x4Ng4kHUnf3NJQ-vEMkGyQhBarLfMhqTtnE7DPIXQdpL5gS2TTDvAlFXddsu0e8TlNkhWW1pBWPvxkKim5aKXknIHe_CRsCbqkWm8ZX-Yo1lvWW74TVNwvrH3qLUzBq8hiUXIzbOxrHnHimYzZ_y9uQdo_Zb5OCaD96H1Y_xVNp-kNZX2QPM0kc5ot0oRLD441TPYEnJQxbEK4uRFlMnPibmvubEnd0Fec32l_iOv_dPq81m8jrfOVlvNiItYYYOJdq7EtFY6FNxF1riEsN7KjjhPN1zJIFmlMzSLe__iTSs44da5cSe8M5Gnp5A9EdY6o3YDoxuihNIh5XgrlbGcuDFMqTZ8C-Hq4eHbcvnwffHz-mH1z-JujR6W65uHxeavIFnFEKqj_BCmKaIZnSkIn2AQaJI--hgbDzE2SJZMuZQKLdaGacAWXDxTNbgA1U9GL5PHhJJFESSLzEXl29uff8HNXR8EvOM6CpQRgYfbAM37bDzvaSbv0vw20JJbIIoyXzT9iSIEKIkgeoqiKMqygpEoz2NWI_DJzWd582z6ix-aS-tTz32fv4rDJI1_PyhjNcONr1aWwKUNUAm-MPhI9gnQVfSU5MhxP1Q5AUriMbysTuYVbPhWYvEdSyqYDlAxcOuHzaCVyP_fE0IDoXmdpWXKEpJW0YCvd9cTzueKhZlRs7yH55aMwCXH4JKsxGXsZcZSyedGdQZ8-mq9vspeV7c_XV67fmr1tctw2CrdP_jJDbc_sV4xIgJU9OHJP3GTwWecAC2cdo-eDQuOHpfg5i_dPZb2tDLSMXBaVnXxHvAbad9CvcTGPxvDfhk9E1s2USqKcAQDVzbmsPjhlTnY3Dv4HYkbWath9tv6_QjIfAwSV3lM9yA3trHesv6Ix826Y6YT9qv4HaW37GPzm1uyW2LDzpRwPpEQY1z__5KwGEtYIZwU0AeVdSeJi5hLLCa-uPHF1O1QdU6gvCybeOS7gvcx4S0BX7n_IfAutMbPd6wOkuWbC9y737sInKCOzjtq__QGnuWpr9Thg-qMG41n0cf2thzvLYuyvP5SgBPiVIDrR8-wO5fRov_rAc6BjCcgq3Re7EEuzN2A670Q8GFMb1rLR8CiCVhCSTnldcAzkeDNeaPQdYxuc79U0rKnvW_4GZVSwsH1Y2dWPnmWOcyHry4oiafFBalRfloobgax3HvnxIBOYz1JZsMpu65rRqz5Dy7pV2Sp_c4dZBnVG1GZoDqjxyCWirJvTI5uXoLpALPh9s5_gRpyz9Hqw_iRkGcXn0XtUI1gZ2PYaZSj8nzYS9W0qpPUAfyH253q7IaodrJTx7NO2NXyTb6L7dab8kaoz9TcZeSkGomdj8Uuy3lZnS_2y8iVos-THDpOK-dDzhyiEeT5GDKuEpqdB3l4d2Lu4RjuN6EqLPqy_Dj57te_il9jbt9eJrpA-BULLXMn1kjuYix3nVYlfk_uv_wr9mGjevkOtUvNJe_l-ogW-vEhmH5qNysHeiRVOZEqqnLyOan-F6RxYI-lQdFEmhjlyeekeVuGT-B0MEY44wnOOaXzc3Heq_aWPTLx-iW2H9kXcy3Wti_mRpRO5nc0yu9xEWFXvL9X0fZknU8rfdO0oh_u6_s_w_ymVdf6ariEHtZVxwVl-jS6UaKO5zUm85HervoP3q6E6RqmP4fjvO1N55VDMdreUQ5GeRonUXoM8wfWhi0295NYzRo8SUQvhc55kLI8chxHkEb5NY5YjNNRfl1rV7tIujhOLU-MdLYvPc9WS4QdixGGfIwhz-pqkuOblgumb3wBStgIxQBspLEJ6M9E-jRCDsYI5yjDxTHOirga13Ee0QHu4_4ddVpmjMT5TJRL49yxH-E7zkQVZTFJixgIiR-GE8XTL607_OpNdTyGlvCoOP0UTEodiBHKcoIyZRGGF9Ut43tv2kdYNw0W4icj-xhyAnI-TiGOxuuauwSq-eMbIWT0EdbBKkgZ95v7oj7_ibNXjtfF4mNMz1WYY3yssNH314rSGFdJ4g-JzyRNqFs5Ij35IosSXEbw8CB4RR6Mxdo-ECyEVwDMHD3TvRyUmGdDWWsCtJatFcOX2umi2S5IFvM0SBbJgWkyZVq5kOOWuDphyqe_dMRDT3xGgmQRoyJIFuho-9JTREeSnBLiJPEknfuv-Xva2dRiUZFBT_Xs3XVr91twdH4eJAvwhzXuopPuNRKsAtb7BRDVNFhS93DDtg2Ttj9OqHEnPAiiNPMH0oy-S75vwqiHIPlCG2rMBaNAO8_Z-C_5jnRnGISPfowx4EdR7ZgPDIdKEBezaOa_6593dP_xVpAXvvf-YNdJ9OZh59CPohmm4I-n3exWGf7UP_IxWAhGV1y_d1B_SqdSWZeO4HAKBo3ZekqD-Xzh76hjY-iRWNzfL5bf4f77Naz_vr39-5-b__wG65vb6w3c_-2Hr_7rG9xd__j77n7fmfDjVI9DYVxserPPYT9BM_Dn-4wCtnuSH9fC0SEfzucZOhzmfYGG2X1uM_6ntuRUT839joF53lfD--4E76VaNYBh59T9W3NrmQT73DKgihkHGwh2Xob7FpXZV9uces6wmfYPAZcWXrqeDm1IljWtwNYTfNUGNczxnVOq7Wv5odnojA4pgI83STkisxOdUvvGpnHL1EcapzZgjoi90UZlPtJGdUEvE1omJb5gl3Fe5kmcF0V8sbtMM8TovMJ1xTKWoCwuEaEUJ5ThGCdldMEvUYSSOIqSaB4VUTxLScFoUaOqIFFallmQRqzBXMxc7Jkpvb3wrUyXeRHNowuBKyaMb9ZDSLLf4B8GCAXZ6kJf-nhVdVsTpJHgxpoDFcutYJc3y2vgEgat9yZJGe0Io-C3kUsQuKkovui0uPx825WH-98BAAD__7B_H3g">