[LLVMbugs] [Bug 20745] New: Assertion `!A->getDeducedType().isNull() && "cannot request the size of an undeduced or dependent auto type"'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20745

            Bug ID: 20745
           Summary: Assertion `!A->getDeducedType().isNull() && "cannot
                    request the size of an undeduced or dependent auto
                    type"'
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alexfh at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Clang crashes on sizeof() of undeduced types:

$ cat crasher2.cc 
template <class _Rp> struct function {
  template <class _Fp> function(_Fp) {
    static_assert(sizeof(_Fp) > 0, "Type must be complete.");
  }
};

template <typename T> void p(T t) {
  auto l = some_undefined_function(t);
  function<void()>(([l]() {}));
}
void q() { p(0); }
$ ~/work/llvm-build-debug/bin/clang-check crasher2.cc -- -std=c++11
crasher2.cc:8:12: error: use of undeclared identifier 'some_undefined_function'
  auto l = some_undefined_function(t);
           ^
crasher2.cc:11:12: note: in instantiation of function template specialization
'p<int>' requested here
void q() { p(0); }
           ^
clang-check: tools/clang/lib/AST/ASTContext.cpp:1694: clang::TypeInfo
clang::ASTContext::getTypeInfoImpl(const clang::Type *) const: Assertion
`!A->getDeducedType().isNull() && "cannot request the size of an undeduced or
dependent auto type"' failed.

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