Add bool builtin

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/obj/bool.rs

@@ -0,0 +1,44 @@
+use crate::obj::{Obj, VTable};
+use crate::syn::span::Span;
+use crate::vm::{error::*, machine::Machine};
+use gc::{Finalize, Trace};
+
+pub type Bool = bool;
+
+#[derive(Debug, Trace, Finalize)]
+pub struct BoolObj {
+    value: Bool,
+    vtable: VTable,
+}
+
+impl BoolObj {
+    pub fn new(value: Bool) -> Self {
+        BoolObj {
+            value,
+            vtable: vtable! {},
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn value(&self) -> Bool {
+        self.value
+    }
+}
+
+impl Obj for BoolObj {
+    fn vtable(&self) -> &VTable {
+        &self.vtable
+    }
+
+    fn vtable_mut(&mut self) -> &mut VTable {
+        &mut self.vtable
+    }
+
+    fn call(&self, call_site: Option<Span>, _: &mut Machine) -> Result<()> {
+        Err(RuntimeError::CannotCall("bool value".to_string()).with_location(call_site))
+    }
+
+    fn as_any(&self) -> &(dyn std::any::Any + 'static) {
+        self
+    }
+}

src/obj/mod.rs

@@ -1,5 +1,6 @@
 #[macro_use]
 mod macros;
+pub mod bool;
 pub mod builtin;
 pub mod float;
 pub mod int;
@@ -7,6 +8,7 @@ pub mod quote;
 pub mod str;
 
 pub mod prelude {
+    pub use crate::obj::bool::*;
     pub use crate::obj::builtin::*;
     pub use crate::obj::float::*;
     pub use crate::obj::int::*;