Give each REPL input a unique source name (<repl:1>, <repl:2>, ...)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: timfennis

ndc_bin/src/repl.rs

@@ -34,14 +34,14 @@ pub fn run() -> anyhow::Result<()> {
 
     let mut interpreter = Interpreter::new();
     interpreter.configure(ndc_stdlib::register);
-    loop {
+    for command_nr in 1.. {
         match rl.readline("λ ") {
             Ok(line) => {
                 // If we can't append the history we just ignore this
                 let _ = rl.add_history_entry(line.as_str());
 
                 // Run the line we just read through the interpreter
-                match interpreter.eval_named("<repl>", line.as_str()) {
+                match interpreter.eval_named(format!("<repl:{command_nr}>"), line.as_str()) {
                     Ok(value) => {
                         let output = value.to_string();
                         if !output.is_empty() {

ndc_interpreter/src/lib.rs

@@ -107,7 +107,11 @@ impl Interpreter {
     }
 
     /// Execute source code with a custom source name for diagnostics.
-    pub fn eval_named(&mut self, name: &str, input: &str) -> Result<Value, InterpreterError> {
+    pub fn eval_named(
+        &mut self,
+        name: impl Into<String>,
+        input: &str,
+    ) -> Result<Value, InterpreterError> {
         let source_id = self.source_db.add(name, input);
         let expressions = self.parse_and_analyse(input, source_id)?;
         self.interpret_vm(input, expressions.into_iter())