From 906e4946a54e8ae70dab3a5ab9d2ca5a3c34d0f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Edvard=20Th=C3=B6rnros?= <edvard.thornros@gmail.com>
Date: Sun, 31 Jan 2021 21:29:52 +0100
Subject: add noisy error on invalid stack

---
 src/vm.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/vm.rs b/src/vm.rs
index 7fe9c23..562bed9 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -89,7 +89,10 @@ impl VM {
     }
 
     fn pop(&mut self) -> Value {
-        self.stack.pop().unwrap()
+        match self.stack.pop() {
+            Some(x) => x,
+            None => self.crash_and_burn(),
+        }
     }
 
     fn poppop(&mut self) -> (Value, Value) {
@@ -117,6 +120,17 @@ impl VM {
         self.frame().block.borrow().ops[ip].clone()
     }
 
+    fn crash_and_burn(&self) -> ! {
+        println!("\n\n    !!!POPING EMPTY STACK - DUMPING EVERYTHING!!!\n");
+        self.print_stack();
+        println!("\n");
+        self.frame().block.borrow().debug_print();
+        println!("    ip: {}, line: {}\n",
+            self.frame().ip.blue(),
+            self.frame().block.borrow().line(self.frame().ip).blue());
+        unreachable!();
+    }
+
     fn error(&self, kind: ErrorKind, message: Option<String>) -> Error {
         let frame = self.frames.last().unwrap();
         Error {
-- 
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