In the editor Sir.
What text editor are you using? Almost all editors have e.g. a plugin or extension you will need to install to enable completion hints for rust.
(also note, the rust playground has no autocompletion, except for extern crate)
Sir, im using php storm ide. The most interesting thing is that hints
appear in the main() scope, however in global scope it works unpredictable.
I think it depends on how your editor is configured to work with the auto-completion for Rust. In my case I use Vim and when I type Vec:: at global (or local) scope I get
Thanks. I might consider to change the ide.
You may want to try out Visual Studio Code. I'm a die-hard vim fan, but I've found that their Rust plugin (giving you access to the RLS) makes the dev experience quite pleasant because you have access to simple things like autocomplete and realtime syntax error checking.