Skylion007 added a comment.

Okay, now I am getting what I believe to be segfaults:

  #0 0x0000564383482be4 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
  #1 0x0000564383480464 SignalHandler(int) Signals.cpp:0:0
  #2 0x00007f7c275c9420 __restore_rt 
(/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
  #3 0x00005643804b0ea5 
clang::tidy::performance::UnnecessaryCopyOnLastUseCheck::check(clang::ast_matchers::MatchFinder::MatchResult
 const&) (.cold) UnnecessaryCopyOnLastUseCheck.cpp:0:0
  #4 0x000056438262bba1 clang::ast_matchers::internal::(anonymous 
namespace)::MatchASTVisitor::MatchVisitor::visitMatch(clang::ast_matchers::BoundNodes
 const&) ASTMatchFinder.cpp:0:0
  #5 0x00005643826818df 
clang::ast_matchers::internal::BoundNodesTreeBuilder::visitMatches(clang::ast_matchers::internal::BoundNodesTreeBuilder::Visitor*)
 (/home/aaron/git/llvm-project/build/bin/clang-tidy+0x2d258df)

It worked before this PR, now it just crashes on a lot of real world codebases 
including just trying to run it for a few files on LLVM's own codebase.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137205/new/

https://reviews.llvm.org/D137205

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