[llvm-bugs] [Bug 38090] New: Crash when trailing return type using recursive instantiation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38090

            Bug ID: 38090
           Summary: Crash when trailing return type using recursive
                    instantiation
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: violet.bugreport at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The program below will cause a crash in every version (trunk, 6.0, 5.0) I
tested:

struct foo {};
template<class T> auto bar(T a) -> decltype(bar(a)) {}
int main() { bar(foo{}); }

Here a demo: https://wandbox.org/permlink/stDUib6jjPIFnIXP

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