Macro tag 

macro_rules! tag {
    ($tag:expr) => { ... };
}

👎Deprecated since 0.5.0: Use group! instead

Creates a categorical tag for error classification.

This macro creates an ErrorContext::tag that can be used to categorize and filter errors.

Deprecated

Use group! instead since version 0.5.0.

Arguments

• $tag - A string or expression that can be converted into a tag