Moved trait ConvertingStack to trait.rs.

src/main.rs

@@ -22,9 +22,8 @@ use recovery::{Guard, FrameInfo};
 mod tracerunner;
 use tracerunner::Runner;
 
-mod util;
-use util::ConvertingStack;
-
+mod traits;
+use traits::vec::ConvertingStack;
 
 pub struct Module {
     funcs: BTreeMap<String, Rc<Func>>,

src/tracerunner.rs

@@ -4,7 +4,7 @@ use super::{TraceInstruction, Comp, Value, Interpreter, CallFrame, Func};
 use recovery::Guard;
 use kaktus::PushPop;
 
-use util::ConvertingStack;
+use traits::vec::ConvertingStack;
 
 
 pub struct Runner<'a, 'b: 'a> {

src/traits.rs

@@ -0,0 +1,31 @@
+
+pub mod vec {
+
+    pub trait ConvertingStack<T> {
+        fn pop_into<U>(&mut self) -> U where U: From<T>;
+
+        fn pop_2_into<U>(&mut self) -> (U, U) where U: From<T>;
+
+        fn push_from<U: Into<T>>(&mut self, val: U);
+
+    }
+
+    impl<T> ConvertingStack<T> for Vec<T> {
+        fn pop_into<U>(&mut self) -> U
+            where U: From<T>
+        {
+            self.pop().unwrap().into()
+        }
+
+        fn pop_2_into<U>(&mut self) -> (U, U)
+            where U: From<T>
+        {
+            (self.pop().unwrap().into(), self.pop().unwrap().into())
+        }
+
+        fn push_from<U: Into<T>>(&mut self, val: U) {
+            self.push(val.into());
+        }
+    }
+
+}