[clang] [LifetimeSafety] Trace assignment history for use-after-scope errors (PR #188467)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

The build failed before running any tests. Click on a failure below to see the details.

<details>
<summary>[code=1] tools/clang/lib/Analysis/LifetimeSafety/CMakeFiles/obj.clangAnalysisLifetimeSafety.dir/Checker.cpp.obj</summary>

```
FAILED: [code=1] tools/clang/lib/Analysis/LifetimeSafety/CMakeFiles/obj.clangAnalysisLifetimeSafety.dir/Checker.cpp.obj
sccache C:\clang\clang-msvc\bin\clang-cl.exe  /nologo -TP -DCLANG_BUILD_STATIC -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\_work\llvm-project\llvm-project\build\tools\clang\lib\Analysis\LifetimeSafety -IC:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety -IC:\_work\llvm-project\llvm-project\clang\include -IC:\_work\llvm-project\llvm-project\build\tools\clang\include -IC:\_work\llvm-project\llvm-project\build\include -IC:\_work\llvm-project\llvm-project\llvm\include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported /Gw /O2 /Ob2  -std:c++17 -MD -UNDEBUG /EHs-c- /GR- /showIncludes /Fotools\clang\lib\Analysis\LifetimeSafety\CMakeFiles\obj.clangAnalysisLifetimeSafety.dir\Checker.cpp.obj /Fdtools\clang\lib\Analysis\LifetimeSafety\CMakeFiles\obj.clangAnalysisLifetimeSafety.dir\ -c -- C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(234,10): error: no member named 'queue' in namespace 'std'
234 |     std::queue<const CFGBlock *> PendingBlocks;
|          ^~~~~
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(234,16): error: expected expression
234 |     std::queue<const CFGBlock *> PendingBlocks;
|                ^
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(252,5): error: use of undeclared identifier 'PendingBlocks'
252 |     PendingBlocks.push(StartBlock);
|     ^~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(254,13): error: use of undeclared identifier 'PendingBlocks'
254 |     while (!PendingBlocks.empty()) {
|             ^~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(255,35): error: use of undeclared identifier 'PendingBlocks'
255 |       const CFGBlock *CurrBlock = PendingBlocks.front();
|                                   ^~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(256,7): error: use of undeclared identifier 'PendingBlocks'
256 |       PendingBlocks.pop();
|       ^~~~~~~~~~~~~
C:\_work\llvm-project\llvm-project\clang\lib\Analysis\LifetimeSafety\Checker.cpp(287,11): error: use of undeclared identifier 'PendingBlocks'
287 |           PendingBlocks.push(Block);
|           ^~~~~~~~~~~~~
7 errors generated.
```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/188467