refactor: drop derivative dependency

Fixes: #179

Cargo.toml

@@ -71,7 +71,6 @@ hashbrown = "0.14.5"
 static_assertions = "1.1"
 rustc-hash = "1.1"
 num-bigint = "0.4.5"
-derivative = "2.2.0"
 strsim = "0.11.0"
 proc-macro2 = "1.0"
 quote = "1.0"

crates/jrsonnet-evaluator/Cargo.toml

@@ -59,5 +59,4 @@ annotate-snippets = { workspace = true, optional = true }
 hi-doc = { workspace = true, optional = true }
 # Bigint
 num-bigint = { workspace = true, features = ["serde"], optional = true }
-derivative.workspace = true
 stacker = "0.1.15"

crates/jrsonnet-evaluator/src/function/parse.rs

@@ -1,8 +1,7 @@
 use std::mem::replace;
 
-use jrsonnet_gcmodule::Trace;
 use jrsonnet_interner::IStr;
-use jrsonnet_parser::{LocExpr, ParamsDesc};
+use jrsonnet_parser::ParamsDesc;
 
 use super::{arglike::ArgsLike, builtin::BuiltinParam};
 use crate::{

crates/jrsonnet-evaluator/src/val.rs

@@ -8,7 +8,6 @@ use std::{
 	rc::Rc,
 };
 
-use derivative::Derivative;
 use jrsonnet_gcmodule::{Cc, Trace};
 use jrsonnet_interner::IStr;
 pub use jrsonnet_macros::Thunk;
@@ -402,8 +401,7 @@ impl Ord for StrValue {
 
 /// Represents jsonnet number
 /// Jsonnet numbers are finite f64, with NaNs disallowed
-#[derive(Trace, Clone, Copy, Derivative)]
-#[derivative(Debug = "transparent")]
+#[derive(Trace, Clone, Copy)]
 #[repr(transparent)]
 pub struct NumValue(f64);
 impl NumValue {
@@ -439,6 +437,11 @@ impl PartialOrd for NumValue {
 		Some(self.cmp(other))
 	}
 }
+impl Debug for NumValue {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		Debug::fmt(&self.0, f)
+	}
+}
 impl Display for NumValue {
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 		Display::fmt(&self.0, f)