Static rustc_lint_defs::builtin::OUT_OF_SCOPE_MACRO_CALLS

pub static OUT_OF_SCOPE_MACRO_CALLS: &Lint

The out_of_scope_macro_calls lint detects macro_rules called when they are not in scope, above their definition, which may happen in key-value attributes.

Example

#![doc = in_root!()]

macro_rules! in_root { () => { "" } }

fn main() {}

{{produces}}

Explanation

The scope in which a macro_rules item is visible starts at that item and continues below it. This is more similar to let than to other items, which are in scope both above and below their definition. Due to a bug macro_rules were accidentally in scope inside some key-value attributes above their definition. The lint catches such cases. To address the issue turn the macro_rules into a regularly scoped item by importing it with use.

This is a future-incompatible lint to transition this to a hard error in the future.