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int main() {
	/*V1*/
	//this is what I want
	auto range = boost::filesystem::directory_iterator(...);
	//unfortunately that may throw an exception which I need to handle, so I cannot use it
 
	/*V2*/
	//ugly code duplication
	decltype(boost::filesystem::directory_iterator(...)) range;
	try{
		range = boost::filesystem::directory_iterator(...);
	}catch{}
}

prog.cpp: In function 'int main()':
prog.cpp:4:15: error: 'boost' has not been declared
  auto range = boost::filesystem::directory_iterator(...);
               ^
prog.cpp:4:53: error: expected primary-expression before '...' token
  auto range = boost::filesystem::directory_iterator(...);
                                                     ^
prog.cpp:9:11: error: 'boost' was not declared in this scope
  decltype(boost::filesystem::directory_iterator(...)) range;
           ^
prog.cpp:9:2: error: expected primary-expression before 'decltype'
  decltype(boost::filesystem::directory_iterator(...)) range;
  ^
prog.cpp:11:11: error: 'boost' is not a class, namespace, or enumeration
   range = boost::filesystem::directory_iterator(...);
           ^
prog.cpp:11:49: error: expected primary-expression before '...' token
   range = boost::filesystem::directory_iterator(...);
                                                 ^
prog.cpp:12:8: error: expected '(' before '{' token
  }catch{}
        ^
prog.cpp:12:8: error: expected type-specifier before '{' token
prog.cpp:12:8: error: expected ')' before '{' token

Standard output is empty