clang assert: "Isn't a single decl"

root [0] struct passwd *pwd = getpwuid(getuid());

root.exe: /home/axel/build/root/master/src/interpreter/llvm/src/tools/clang/include/clang/AST/DeclGroup.h:87: clang::Decl* clang::DeclGroupRef::getSingleDecl(): Assertion `isSingleDecl() && "Isn't a single decl"' failed.