Move Symbol to common

We want to use the same definition in the fast interpreter.

Author: melted

nib-core/src/common.rs

@@ -6,6 +6,7 @@ use std::{
 
 use anyhow::anyhow;
 use thiserror::Error;
+use internment::Intern;
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct Metadata {
@@ -190,3 +191,5 @@ impl Display for Name {
 pub fn align_int(value: usize, alignment: usize) -> usize {
     (value + (alignment - 1)) & !(alignment - 1)
 }
+
+pub type Symbol = Intern<String>;

nib-core/src/treewalker.rs

@@ -15,18 +15,17 @@ use libffi::middle::{Cif, CodePtr};
 
 use crate::{
     common::{Error, Metadata, Name, Result},
-    core::{Arity, Lambda, desugar, desugar_expression},
+    core::{desugar, desugar_expression, Arity, Lambda},
     parser::{parse_declarations, parse_expression},
     treewalker::evaluate::Environment,
 };
+use crate::common::Symbol;
 
 mod evaluate;
 mod foreign;
 mod prims;
 mod tests;
 
-type Symbol = Intern<String>;
-
 #[derive(Debug, Clone)]
 pub struct Runtime {
     metadata: HashMap<String, Metadata>,

nib-core/src/treewalker/evaluate.rs

@@ -10,9 +10,10 @@ use log::info;
 use crate::{
     ast::Literal,
     common::{Name, Result},
-    core::{Arity, Binder, Binding, Expression, Lambda, Module, free_vars},
-    treewalker::{CType, Closure, Code, Runtime, Symbol, Value, new_ref},
+    core::{free_vars, Arity, Binder, Binding, Expression, Lambda, Module},
+    treewalker::{new_ref, CType, Closure, Code, Runtime, Value},
 };
+use crate::common::Symbol;
 
 impl Runtime {
     pub(super) fn evaluate(&mut self, code: &mut Module, env: &mut Environment) -> Result<()> {

nib-core/src/treewalker/prims.rs

@@ -1,9 +1,9 @@
 use std::ops::{Shl, Shr};
 use std::os::raw::c_void;
 
-use crate::common::{Error, Name, Result};
+use crate::common::{Error, Name, Result, Symbol};
 use crate::core::Arity;
-use crate::treewalker::{Runtime, Symbol, Value};
+use crate::treewalker::{Runtime, Value};
 
 impl Runtime {
     pub(super) fn register_primitives(&mut self) -> Result<()> {