2016-02-19から1日間の記事一覧
error: mismatched types: expected `collections::string::String`, found `core::option::Option<collections::string::String>` (expected struct `collections::string::String`, found enum `core::option::Option`) [E0308] のエラーが頻発。 collections::string::Stringがほしいの</collections::string::string>…