invr 0.2.1

Declarative data validation engine using invariants executed on Polars DataFrames.
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use crate::severity::Severity;
use std::fmt;

impl fmt::Display for Severity {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let s = match self {
            Severity::Info => "INFO",
            Severity::Warn => "WARN",
            Severity::Error => "ERROR",
        };
        write!(f, "{s}")
    }
}