https://bugs.llvm.org/show_bug.cgi?id=45207
Bug ID: 45207
Summary: Crash on invalid recursive variadic template struct
definition
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: ryan_greenbl...@brown.edu
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
I have filed the same bug on github here:
https://github.com/llvm/llvm-project/issues/181, but I am posting here for
completeness.
This happens with 10 rc2/rc3 and latest dev built from source.
This is a pretty minimal reproduction:
```
template <char First, char... Rest> struct Recursive {
using next = typename Recursive<Rest...>::type;
using type = notdefined<next::anything>;
};
```
Build with `clang++ -std=c++2a test.cpp`
It doesn't crash with `-std=c++17`
I made a docker container which reproduces the issue:
https://hub.docker.com/r/greenblattryan/clang-crash-recursive-template.
Backtrace: https://github.com/llvm/llvm-project/files/4333084/backtrace.txt
Here is a zip with the backtrace, preprocessed source and associated run
script.
https://github.com/llvm/llvm-project/files/4333081/bug-report.zip
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