Revert "Use strings for errors."

This reverts commit 7b87d7185fc93b92606fcacbc1ea3d7a8e02cb20.

It was an interesting experiment, but String seems to be worse than
Box<dyn Error> in every way.

1 files changed, 7 insertions, 6 deletions

diff --git a/bytecode/src/heap.rs b/bytecode/src/heap.rs
index d956e2e..970db7d 100644
--- a/bytecode/src/heap.rs
+++ b/bytecode/src/heap.rs
@@ -1,4 +1,5 @@
 use crate::value::Value;
+use std::error::Error;
 
 pub const NUM_LOCALS: usize = 256;
 
@@ -107,9 +108,9 @@ impl Heap {
         self.buf.resize(new_size * 2, 0);
     }
 
-    pub fn alloc(&mut self, size: i64) -> Result<usize, String> {
+    pub fn alloc(&mut self, size: i64) -> Result<usize, Box<dyn Error>> {
         if size <= 0 {
-            return Err(String::from("alloc of zero size"));
+            return Err(Box::from("alloc of zero size"));
         }
         let usize = usize::try_from(size).expect("32 bits in 2024 LULW");
         self.collect_garbage();
@@ -124,16 +125,16 @@ impl Heap {
         Ok(p)
     }
 
-    pub fn peek(&self, p: usize) -> Result<Value, String> {
+    pub fn peek(&self, p: usize) -> Result<Value, Box<dyn Error>> {
         if p >= self.buf.len() {
-            return Err(String::from("peek: out of range"));
+            return Err(Box::from("peek: out of range"));
         }
         Ok(Value(self.buf[p]))
     }
 
-    pub fn poke(&mut self, p: usize, val: Value) -> Result<(), String> {
+    pub fn poke(&mut self, p: usize, val: Value) -> Result<(), Box<dyn Error>> {
         if p >= self.buf.len() {
-            return Err(String::from("poke: out of range"));
+            return Err(Box::from("poke: out of range"));
         }
         self.buf[p] = val.repr();
         Ok(())