macros: Allow arguments in non-main functions

[DoumanAsh]

Removes restriction on arguments in non-main functions

We don't really return future, so lifetime should not be concern

P.s. these build tests are utter shite

[taiki-e]

P.s. these build tests are utter shite

I recommend using TRYBUILD=overwrite. I think this almost eliminates the pain of UI tests.

https://github.com/dtolnay/trybuild#workflow

Alternatively, run cargo test with the environment variable TRYBUILD=overwrite to skip the wip directory and write all compiler output directly in place.

[DoumanAsh]

And I recommend to not use this shit at all ;0
I'll check it later

[taiki-e]

LGTM