Auto-complete didn't work inside proc macro .

[nurmohammed840]

See: dtolnay/syn#1472

[flodiebold]

With a function-like proc macro, rust-analyzer has no idea that the tokens inside are supposed to be code, so it can't do any error recovery. And syn will just fail to parse the incomplete code num., and the proc macro won't return anything, so rust-analyzer has no way of knowing what to do with it. See also #7402. You can make this proc macro work by not parsing the input, and just passing it through. Or if you need to analyze it somehow, you need an error-resilient parser.

[nurmohammed840]

I think you misunderstood, The code is not incomplete, and the proc macro do return valid code, with code span preserved.

[flodiebold]

When you're writing

fn main() {
    code!({
        let num = 42;
        num.  // No code completion ☹️
    });
}

the code is incomplete and not a valid expression, so syn::parse_macro_input!(input) fails and the proc macro returns an error.

[nurmohammed840]

I re-implemented my proc-macro with a more IDE friendly, which solved this problem.