postgres-query proc macro not resolved

[yokujin]

Using the following macro:

#[macro_export]
macro_rules! query_dyn {
    ($($tt:tt)*) => {
        $crate::__query_dynamic!($($tt)*)
    };
}

error flagged in rust-analyzer: could not resolve macro $crate::__query_dynamic rust-analyzer(macro-error).

Rust compiler compiles that code without any error. cargo check/cargo clippy find no errors/warnings.

Latest release version of rust-analyzer (2020-11-30) does not flag this error either.

[lnicola]

Probably duplicate of #6716.

[jonas-schievink]

I think we need more info here. How do you invoke query_dyn, and what's the definition of __query_dynamic?

[yokujin]

query_dyn macro is a part of postgres-query crate.

Invoked as specified in documentation:

let mut bindings = Vec::new();
// some code
let query: Query = query_dyn!(&sql, ..bindings)?;

Macro defined here.

__query_dynamic is several lines below.

[flodiebold]

@yokujin Does this still occur with current rust-analyzer?

[yokujin]

nightly version - nothing changed...

Still, the only working version is 2020-11-30.

[flodiebold]

The __query_dynamic macro is a proc macro and uses proc_macro_hack. The problem is probably the proc_macro_hack, but do you have rust-analyzer.procMacro.enable and rust-analyzer.cargo.loadOutDirsFromCheck enabled?

[yokujin]

"rust-analyzer.procMacro.enable": true

Cargo: Load Out Dirs From Check is unchecked

[flodiebold]

You'll need to enable both for proc macros to work.

[yokujin]

I enabled all the required options and updated to nightly...
It gets even worse... Even macrros from slog, slog_scope crates flag errors.

/// Log a debug level message using current scope logger
#[macro_export]
macro_rules! debug( ($($args:tt)+) => {
    $crate::with_logger(|logger| $crate::slog_debug![logger, $($args)+])
};);

[flodiebold]

That's #6955, a different bug.

[edwin0cheng]

OTOH, , proc_macro_hack is not support for now due to we have not support proc macro attributes yet.

[stabler]

I'm having the same issue with the select_biased! macro in the futures crate (which calls select_biased_internal, which uses proc_macro_hack)

[Ciantic]

It's hard to tell which macro issues are related, but I'm having problems with importing "parse_macro_input":

Not sure if it's related, but I wish not open a new issue until I know.

I have also this in my settings.json:

{
    "rust-analyzer.updates.channel": "nightly",
    "rust-analyzer.experimental.procAttrMacros": true
}

[Veykril]

This now works