hakorune/src/mir/builder/control_flow/debug.rs

//! Debug utilities for control flow tracing.
//!
//! This module provides diagnostic tools for tracing and debugging
//! control flow behavior during MIR construction.
//!
//! # Environment Variables
//!
//! - `NYASH_TRACE_VARMAP=1` - Enable variable map tracing

use super::super::MirBuilder;

impl MirBuilder {
    /// Trace variable_map state for debugging
    /// Enable with NYASH_TRACE_VARMAP=1
    pub(in crate::mir::builder) fn trace_varmap(&self, context: &str) {
        if std::env::var("NYASH_TRACE_VARMAP").is_ok() {
            let vars: Vec<_> = self.variable_map.iter()
                .map(|(k, v)| format!("{}={:?}", k, v))
                .collect();
            eprintln!("[varmap/{}] {{{}}}", context, vars.join(", "));
        }
    }
}