#rust folks it's supposed to throw this error without lazy_static crate , but it doesn't?

If you're using an LLM to "learn", stop. Otherwise, I don't understand what lazy_static has to do with anything.

It's hard to tell what you're asking. But maybe you're confused because println! (it's a macro btw) expands to code that involves format_args! which is a compiler built-in that doesn't take ownership of the token expressions that get passed to it. Notice how the bottom of the format_args! page has this to say:

Lifetime limitation

Except when no formatting arguments are used, the produced fmt::Arguments value borrows temporary values, which means it can only be used within the same expression and cannot be stored for later use. This is a known limitation, see #92698.

So, it's kind of a feature and a limitation at the same time.