visual studio 2010 - Cannot initialize unordered_map from int -

i've got strange problem. msvc doesn't have initializer lists, i've used lambda approximate them.

static const std::unordered_map<std::wstring, lexedfile::token> reserved_words =      []() -> std::unordered_map<std::wstring, lexedfile::token> {     std::unordered_map<std::wstring, lexedfile::token> retval;     // stuff retval     return retval; }(); 

msvc throws compiler error.

error c2440: 'initializing' : cannot convert 'int'  'std::tr1::unordered_map<_kty,_ty>' 

unless i'm quite blind, there's no "int" anywhere near this. don't see what's wrong. suggestions?

edit:

there's nothing funky // stuff retval, it's bunch of insertions, , function-scope static variable in lambda in member function.

auto next = [&] {     static const std::unordered_map<std::wstring, lexedfile::token> reserved_words =      []() -> std::unordered_map<std::wstring, lexedfile::token> {         std::unordered_map<std::wstring, lexedfile::token> retval;         retval[l"namespace"] = lexedfile::token::namespace;         retval[l"for"] = lexedfile::token::for;         retval[l"while"] = lexedfile::token::while;         retval[l"do"] = lexedfile::token::do;         retval[l"switch"] = lexedfile::token::switch;         retval[l"case"] = lexedfile::token::case;         retval[l"default"] = lexedfile::token::default;         retval[l"try"] = lexedfile::token::try;         retval[l"catch"] = lexedfile::token::catch;         retval[l"auto"] = lexedfile::token::auto;         retval[l"type"] = lexedfile::token::type;         retval[l"break"] = lexedfile::token::break;         retval[l"continue"] = lexedfile::token::continue;         retval[l"return"] = lexedfile::token::return;         retval[l"static"] = lexedfile::token::static;         retval[l"sizeof"] = lexedfile::token::sizeof;         retval[l"decltype"] = lexedfile::token::decltype;         retval[l"if"] = lexedfile::token::if;         retval[l"else"] = lexedfile::token::else;         return retval;     }();     if (stack.empty())         return;     std::wstring token(stack.begin(), stack.end());     stack.clear();     if (reserved_words.find(token) != reserved_words.end()) {         l.tokens.push_back(reserved_words.find(token)->second);         return;     }     l.tokens.push_back(lexedfile::identifier); }; 

the compiler accept if use constructor directly not initialization, seems strange. compiler bug.

calling constructor () instead of using = works fine, i'm marking 1 compiler error.