[llvm-bugs] [Bug 38888] New: ExprMutationAnalyzer crash with uninstanciated templates

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38888

            Bug ID: 38888
           Summary: ExprMutationAnalyzer crash with uninstanciated
                    templates
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: lebedev.ri at gmail.com
                CC: llvm-bugs at lists.llvm.org

template <typename a> class b {
  typedef a c;
  c m_fn1() const noexcept;
};
template <typename a> typename b<a>::c b<a>::m_fn1() const noexcept {
  c d;
  for (; d > 0;)
    ;
}

So, i'm not quite sure how to write a test for this,
but if i call ExprMutationAnalyzer::findDeclMutation() with vardecl of "c d;",
with stmt (the scope) being either loop condition, loop increment, or loop body
(i'm not sure which one it is) there is a crash.

Sorry that i can't quite yet provide more actionable info.

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