Claude/add academic proofs mg s2z (#31)

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath

src/interpreter/mod.rs

@@ -1,6 +1,6 @@
 mod value;
 
-pub use value::{CapturedEnv, Closure, Value};
+pub use value::{CapturedEnv, ChannelHandle, Closure, Value};
 
 use crate::ast::*;
 use std::cell::RefCell;

src/interpreter/value.rs

@@ -3,6 +3,9 @@ use std::collections::HashMap;
 use std::fmt;
 use std::rc::Rc;
 use std::cell::RefCell;
+use std::sync::mpsc::{self, Receiver, RecvTimeoutError, Sender, TryRecvError};
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
 
 /// Captured environment for closures
 #[derive(Debug, Clone)]
@@ -43,6 +46,135 @@ impl PartialEq for Closure {
     }
 }
 
+/// Channel handle for Go-style channels
+/// Channels allow typed, thread-safe communication between concurrent tasks
+#[derive(Clone)]
+pub struct ChannelHandle {
+    /// Sender side
+    sender: Sender<Value>,
+    /// Receiver side (wrapped in Arc<Mutex> for sharing)
+    receiver: Arc<Mutex<Receiver<Value>>>,
+    /// Channel name (optional, for debugging)
+    pub name: Option<String>,
+    /// Whether the channel is closed
+    closed: Arc<Mutex<bool>>,
+    /// Buffer capacity (0 = unbuffered/sync)
+    pub capacity: usize,
+}
+
+impl std::fmt::Debug for ChannelHandle {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Channel")
+            .field("name", &self.name)
+            .field("capacity", &self.capacity)
+            .field("closed", &*self.closed.lock().unwrap())
+            .finish()
+    }
+}
+
+impl PartialEq for ChannelHandle {
+    fn eq(&self, _other: &Self) -> bool {
+        // Channels are never equal (identity comparison would need Arc pointer comparison)
+        false
+    }
+}
+
+impl ChannelHandle {
+    /// Create a new unbuffered channel
+    pub fn new() -> Self {
+        let (sender, receiver) = mpsc::channel();
+        Self {
+            sender,
+            receiver: Arc::new(Mutex::new(receiver)),
+            name: None,
+            closed: Arc::new(Mutex::new(false)),
+            capacity: 0,
+        }
+    }
+
+    /// Create a new unbuffered channel with a name
+    pub fn with_name(name: String) -> Self {
+        let mut ch = Self::new();
+        ch.name = Some(name);
+        ch
+    }
+
+    /// Create a buffered channel
+    pub fn buffered(capacity: usize) -> Self {
+        let (sender, receiver) = mpsc::channel();
+        Self {
+            sender,
+            receiver: Arc::new(Mutex::new(receiver)),
+            name: None,
+            closed: Arc::new(Mutex::new(false)),
+            capacity,
+        }
+    }
+
+    /// Send a value through the channel
+    pub fn send(&self, value: Value) -> Result<(), String> {
+        if *self.closed.lock().unwrap() {
+            return Err("cannot send on closed channel".to_string());
+        }
+        self.sender
+            .send(value)
+            .map_err(|_| "channel send failed: receiver dropped".to_string())
+    }
+
+    /// Receive a value from the channel (blocking)
+    pub fn recv(&self) -> Result<Value, String> {
+        if *self.closed.lock().unwrap() {
+            return Err("cannot receive on closed channel".to_string());
+        }
+        let receiver = self.receiver.lock().unwrap();
+        receiver
+            .recv()
+            .map_err(|_| "channel receive failed: sender dropped".to_string())
+    }
+
+    /// Try to receive a value (non-blocking)
+    pub fn try_recv(&self) -> Result<Option<Value>, String> {
+        if *self.closed.lock().unwrap() {
+            return Ok(None);
+        }
+        let receiver = self.receiver.lock().unwrap();
+        match receiver.try_recv() {
+            Ok(value) => Ok(Some(value)),
+            Err(TryRecvError::Empty) => Ok(None),
+            Err(TryRecvError::Disconnected) => Err("channel disconnected".to_string()),
+        }
+    }
+
+    /// Receive with timeout
+    pub fn recv_timeout(&self, timeout_ms: u64) -> Result<Option<Value>, String> {
+        if *self.closed.lock().unwrap() {
+            return Ok(None);
+        }
+        let receiver = self.receiver.lock().unwrap();
+        match receiver.recv_timeout(Duration::from_millis(timeout_ms)) {
+            Ok(value) => Ok(Some(value)),
+            Err(RecvTimeoutError::Timeout) => Ok(None),
+            Err(RecvTimeoutError::Disconnected) => Err("channel disconnected".to_string()),
+        }
+    }
+
+    /// Close the channel
+    pub fn close(&self) {
+        *self.closed.lock().unwrap() = true;
+    }
+
+    /// Check if the channel is closed
+    pub fn is_closed(&self) -> bool {
+        *self.closed.lock().unwrap()
+    }
+}
+
+impl Default for ChannelHandle {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 /// Runtime value in WokeLang
 #[derive(Debug, Clone, PartialEq)]
 pub enum Value {
@@ -60,6 +192,8 @@ pub enum Value {
     Oops(String),
     /// First-class function/closure
     Function(Closure),
+    /// Go-style channel for concurrent communication
+    Channel(ChannelHandle),
 }
 
 impl Value {
@@ -76,6 +210,7 @@ impl Value {
             Value::Okay(_) => true,
             Value::Oops(_) => false,
             Value::Function(_) => true,
+            Value::Channel(ch) => !ch.is_closed(),
         }
     }
 
@@ -133,6 +268,13 @@ impl fmt::Display for Value {
                 let param_names: Vec<_> = closure.params.iter().map(|p| p.name.as_str()).collect();
                 write!(f, "|{}| -> <closure>", param_names.join(", "))
             }
+            Value::Channel(ch) => {
+                let status = if ch.is_closed() { "closed" } else { "open" };
+                match &ch.name {
+                    Some(name) => write!(f, "<chan:{} {}>", name, status),
+                    None => write!(f, "<chan {}>", status),
+                }
+            }
         }
     }
 }