chore(users): grfn -> aspen

Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/grfn/achilles/src/interpreter/error.rs

@@ -1,19 +0,0 @@
-use std::result;
-
-use thiserror::Error;
-
-use crate::ast::{Ident, Type};
-
-#[derive(Debug, PartialEq, Eq, Error)]
-pub enum Error {
-    #[error("Undefined variable {0}")]
-    UndefinedVariable(Ident<'static>),
-
-    #[error("Unexpected type {actual}, expected type {expected}")]
-    InvalidType {
-        actual: Type<'static>,
-        expected: Type<'static>,
-    },
-}
-
-pub type Result<T> = result::Result<T, Error>;