October commit

- custom parser support and infra
- type-tagging and traits (untested)
- match expressions

src/interpreter/error.rs

@@ -1,22 +1,22 @@
-use std::fmt::Display;
-use std::rc::Rc;
+use std::fmt::{Debug, Display};
+use std::sync::Arc;
 
 use crate::foreign::ExternError;
 use crate::{Location, Sym};
 
 /// Problems in the process of execution
-#[derive(Clone, Debug)]
+#[derive(Debug, Clone)]
 pub enum RuntimeError {
   /// A Rust function encountered an error
-  Extern(Rc<dyn ExternError>),
+  Extern(Arc<dyn ExternError>),
   /// Primitive applied as function
   NonFunctionApplication(Location),
   /// Symbol not in context
   MissingSymbol(Sym, Location),
 }
 
-impl From<Rc<dyn ExternError>> for RuntimeError {
-  fn from(value: Rc<dyn ExternError>) -> Self { Self::Extern(value) }
+impl From<Arc<dyn ExternError>> for RuntimeError {
+  fn from(value: Arc<dyn ExternError>) -> Self { Self::Extern(value) }
 }
 
 impl Display for RuntimeError {

src/interpreter/handler.rs

@@ -1,5 +1,5 @@
 use std::any::{Any, TypeId};
-use std::rc::Rc;
+use std::sync::Arc;
 
 use hashbrown::HashMap;
 use trait_set::trait_set;
@@ -58,7 +58,7 @@ impl<'a> HandlerTable<'a> {
 
 /// Various possible outcomes of a [Handler] execution. Ok returns control to
 /// the interpreter. The meaning of Err is decided by the value in it.
-pub type HandlerRes = Result<ExprInst, Rc<dyn ExternError>>;
+pub type HandlerRes = Result<ExprInst, Arc<dyn ExternError>>;
 
 /// [run] orchid code, executing any commands it returns using the specified
 /// [Handler]s.