questionable refactoring

src/compiler/debug.rs

@@ -0,0 +1,23 @@
+use crate::ir::Symbol;
+
+pub struct DebugInfo {
+    pub sym_labels: Vec<Option<String>>,
+    pub ir_lower: Vec<Vec<(usize, String)>>,
+}
+
+impl DebugInfo {
+    pub fn new(sym_labels: Vec<Option<String>>) -> Self {
+        Self {
+            ir_lower: Vec::new(),
+            sym_labels,
+        }
+    }
+
+    pub fn push_fn(&mut self, instrs: Vec<(usize, String)>) {
+        self.ir_lower.push(instrs);
+    }
+
+    pub fn sym_label(&self, s: Symbol) -> Option<&String> {
+        self.sym_labels[*s].as_ref()
+    }
+}