--- a/Cargo.lock
+++ b/Cargo.lock
@@ -676,18 +676,18 @@
 
 [[package]]
 name = "jrsonnet-gcmodule"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c33f4f6cdc60f5ae94ebae3dfe7f484ae79b364225d9b19601b24c804cfd8751"
+checksum = "f95b976a79e4000bb9e07ff0709dca0ea27bcf1952d4c17d91fb7364d6145683"
 dependencies = [
  "jrsonnet-gcmodule-derive",
 ]
 
 [[package]]
 name = "jrsonnet-gcmodule-derive"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b30c95b285f9bb6709f1b3e6fc69b3a25e39b32ff987587fd108f0f22be5fa3"
+checksum = "51d928626220a310ff0cec815e80cf7fe104697184352ca21c40534e0b0d72d9"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1602,7 +1602,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@
 jrsonnet-cli = { path = "./crates/jrsonnet-cli", version = "0.5.0-pre97" }
 jrsonnet-types = { path = "./crates/jrsonnet-types", version = "0.5.0-pre97" }
 jrsonnet-formatter = { path = "./crates/jrsonnet-formatter", version = "0.5.0-pre97" }
-jrsonnet-gcmodule = { version = "0.4.1" }
+jrsonnet-gcmodule = { version = "0.4.2" }
 # Diagnostics.
 # hi-doc is my library, which handles text formatting very well, but isn't polished enough yet
 # Previous implementation was based on annotate-snippets, which I don't like for many reasons.
--- a/bindings/jsonnet/src/import.rs
+++ b/bindings/jsonnet/src/import.rs
@@ -66,8 +66,8 @@
 				base.as_ptr(),
 				rel.as_ptr(),
 				&mut found_here.cast_const(),
-				&mut buf,
-				&mut buf_len,
+				&raw mut buf,
+				&raw mut buf_len,
 			)
 		};
 		let buf_slice: &[u8] = unsafe { std::slice::from_raw_parts(buf.cast(), buf_len) };
--- a/crates/jrsonnet-evaluator/src/evaluate/destructure.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate/destructure.rs
@@ -9,6 +9,9 @@
 	evaluate_method, evaluate_named_param, Context, Pending, Thunk, Val,
 };
 
+#[cfg(feature = "exp-preserve-order")]
+use crate::evaluate;
+
 #[allow(clippy::too_many_lines)]
 #[allow(unused_variables)]
 pub fn destruct<H: BuildHasher>(
--- a/crates/jrsonnet-evaluator/src/evaluate/mod.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate/mod.rs
@@ -143,7 +143,7 @@
 					false,
 				) {
 					let fctx = Pending::new();
-					let mut new_bindings = FxHashMap::with_capacity(var.capacity_hint());
+					let mut new_bindings = FxHashMap::with_capacity(var.binds_len());
 					let obj = obj.clone();
 					let value = Thunk::evaluated(Val::Arr(ArrValue::lazy(vec![
 						Thunk::evaluated(Val::string(field.clone())),
--- a/crates/jrsonnet-evaluator/src/function/builtin.rs
+++ b/crates/jrsonnet-evaluator/src/function/builtin.rs
@@ -98,9 +98,9 @@
 
 	fn call(&self, _loc: CallLocation<'_>, args: &[Option<Thunk<Val>>]) -> Result<Val> {
 		let args = args
-			.into_iter()
+			.iter()
 			.map(|a| a.as_ref().expect("legacy natives have no default params"))
-			.map(|a| a.evaluate())
+			.map(Thunk::evaluate)
 			.collect::<Result<Vec<Val>>>()?;
 		self.handler.call(&args)
 	}
--- a/crates/jrsonnet-evaluator/src/obj/mod.rs
+++ b/crates/jrsonnet-evaluator/src/obj/mod.rs
@@ -1,12 +1,5 @@
 use std::{
-	any::Any,
-	cell::{Cell, RefCell},
-	clone::Clone,
-	collections::hash_map::Entry,
-	fmt::{self, Debug},
-	hash::{Hash, Hasher},
-	num::Saturating,
-	ops::ControlFlow,
+	any::Any, cell::{Cell, RefCell}, clone::Clone, cmp::Reverse, collections::hash_map::Entry, fmt::{self, Debug}, hash::{Hash, Hasher}, num::Saturating, ops::ControlFlow
 };
 
 use educe::Educe;
@@ -39,18 +32,19 @@
 
 	use jrsonnet_gcmodule::Trace;
 
-	#[derive(Clone, Copy, Default, Debug, Trace)]
+	#[derive(Clone, Copy, Default, Debug, Trace, PartialEq, Eq, PartialOrd, Ord)]
 	pub struct FieldIndex(());
 	impl FieldIndex {
 		pub fn absolute(_v: u32) -> Self {
 			Self(())
 		}
+		#[must_use]
 		pub const fn next(self) -> Self {
 			Self(())
 		}
 	}
 
-	#[derive(Clone, Copy, Default, Debug, Trace)]
+	#[derive(Clone, Copy, Default, Debug, Trace, PartialEq, Eq, PartialOrd, Ord)]
 	pub struct SuperDepth(());
 	impl SuperDepth {
 		pub(super) fn deepen(self) {}
@@ -59,8 +53,6 @@
 
 #[cfg(feature = "exp-preserve-order")]
 pub mod ordering {
-	use std::cmp::Reverse;
-
 	use jrsonnet_gcmodule::Trace;
 
 	#[derive(Clone, Copy, Default, Debug, Trace, PartialEq, Eq, PartialOrd, Ord)]
@@ -69,6 +61,7 @@
 		pub fn absolute(v: u32) -> Self {
 			Self(v)
 		}
+		#[must_use]
 		pub fn next(self) -> Self {
 			Self(self.0 + 1)
 		}
@@ -78,22 +71,20 @@
 	pub struct SuperDepth(u32);
 	impl SuperDepth {
 		pub(super) fn deepen(&mut self) {
-			self.0 += 1
+			self.0 += 1;
 		}
 	}
+}
+
+use ordering::{FieldIndex, SuperDepth};
 
-	#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
-	pub struct FieldSortKey(Reverse<SuperDepth>, FieldIndex);
-	impl FieldSortKey {
-		pub fn new(depth: SuperDepth, index: FieldIndex) -> Self {
-			Self(Reverse(depth), index)
-		}
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
+pub struct FieldSortKey(Reverse<SuperDepth>, FieldIndex);
+impl FieldSortKey {
+	pub fn new(depth: SuperDepth, index: FieldIndex) -> Self {
+		Self(Reverse(depth), index)
 	}
 }
-
-#[cfg(feature = "exp-preserve-order")]
-use ordering::FieldSortKey;
-use ordering::{FieldIndex, SuperDepth};
 
 // 0 - add
 //  12 - visibility
@@ -795,7 +786,7 @@
 struct FieldVisibilityData {
 	omitted_until: Saturating<usize>,
 	exists_visible: Option<Visibility>,
-	#[cfg(feature = "exp-preserve-order")]
+	#[allow(dead_code, reason = "used for exp-object-ordering, ZST otherwise")]
 	key: FieldSortKey,
 }
 impl FieldVisibilityData {
@@ -804,7 +795,7 @@
 			.expect("non-existing fields shall be dropped at the end of fn fields_visibility()")
 			.is_visible()
 	}
-	#[cfg(feature = "exp-preserve-order")]
+	#[allow(dead_code, reason = "used for exp-object-ordering, ZST otherwise")]
 	fn sort_key(&self) -> FieldSortKey {
 		self.key
 	}
@@ -818,12 +809,11 @@
 		let mut omit_index = Saturating(0);
 		for core in self.0.cores.iter().rev() {
 			core.0
-				.enum_fields_core(&mut super_depth, &mut |_depth, _index, name, visibility| {
+				.enum_fields_core(&mut super_depth, &mut |depth, index, name, visibility| {
 					let entry = out.entry(name);
-					let data = entry.or_insert(FieldVisibilityData {
+					let data = entry.or_insert_with(|| FieldVisibilityData {
 						exists_visible: None,
-						#[cfg(feature = "exp-preserve-order")]
-						key: FieldSortKey::new(_depth, _index),
+						key: FieldSortKey::new(depth, index),
 						omitted_until: omit_index,
 					});
 					match visibility {
--- a/crates/jrsonnet-evaluator/src/typed/conversions.rs
+++ b/crates/jrsonnet-evaluator/src/typed/conversions.rs
@@ -61,9 +61,16 @@
 	}
 }
 
+#[diagnostic::on_unimplemented(
+	note = "don't implement `ParseTypedObj` directly, it is automatically provided by `FromUntyped` derive"
+)]
 pub trait ParseTypedObj: Typed {
 	fn parse(obj: &ObjValue) -> Result<Self>;
 }
+
+#[diagnostic::on_unimplemented(
+	note = "don't implement `SerializeTypedObj` directly, it is automatically provided by `IntoUntyped` derive"
+)]
 pub trait SerializeTypedObj: Typed {
 	fn serialize(self, out: &mut ObjValueBuilder) -> Result<()>;
 	fn into_object(self) -> Result<ObjValue> {
--- a/crates/jrsonnet-formatter/src/comments.rs
+++ b/crates/jrsonnet-formatter/src/comments.rs
@@ -136,7 +136,7 @@
 								}
 								line = new_line.to_string();
 							}
-							p!(out, string(line.to_string()) nl);
+							p!(out, string(line.clone()) nl);
 						}
 					}
 					if doc {
--- a/crates/jrsonnet-formatter/src/lib.rs
+++ b/crates/jrsonnet-formatter/src/lib.rs
@@ -37,8 +37,7 @@
 		format_comments(&e.trivia, CommentLocation::EndOfItems, &mut items);
 		items.into_rc_path()
 	};
-	let items =
-		new_line_group(pi!(@i; items(o.into()) items(end_comments_items.into()))).into_rc_path();
+	let items = new_line_group(pi!(@i; items(o) items(end_comments_items.into()))).into_rc_path();
 
 	let indented = with_indent(pi!(@i; nl items(items.into())));
 
@@ -355,48 +354,48 @@
 }
 impl Printable for ArgsDesc {
 	fn print(&self, out: &mut PrintItems) {
-		let start = LineNumber::new("args start line");
-		let end = LineNumber::new("args end line");
-		let multi_line = Rc::new(move |condition_context: &mut ConditionResolverContext| {
-			is_multiple_lines(condition_context, start, end)
-		});
-
-		let (children, end_comments) = children_between::<Arg>(
-			self.syntax().clone(),
-			self.l_paren_token().map(Into::into).as_ref(),
-			self.r_paren_token().map(Into::into).as_ref(),
-			None,
-		);
-
 		fn gen_args(children: Vec<Child<Arg>>, multi_line: ConditionResolver) -> PrintItems {
-			let mut _out = PrintItems::new();
-			let out = &mut _out;
+			let mut out = PrintItems::new();
 
 			let mut args = children.into_iter().peekable();
 			while let Some(ele) = args.next() {
 				if ele.should_start_with_newline {
 					p!(out, nl);
 				}
-				format_comments(&ele.before_trivia, CommentLocation::AboveItem, out);
+				format_comments(&ele.before_trivia, CommentLocation::AboveItem, &mut out);
 				let arg = ele.value;
 				if arg.name().is_some() || arg.assign_token().is_some() {
-					p!(out, {arg.name()} str(" = "));
+					p!(&mut out, {arg.name()} str(" = "));
 				}
-				p!(out, { arg.expr() });
+				p!(&mut out, { arg.expr() });
 				let has_more = args.peek().is_some();
 				if has_more {
 					p!(out, str(","));
 				} else {
 					p!(out, if("trailing comma", multi_line, str(",")));
 				}
-				format_comments(&ele.inline_trivia, CommentLocation::ItemInline, out);
+				format_comments(&ele.inline_trivia, CommentLocation::ItemInline, &mut out);
 				if has_more {
 					p!(out, if_else("arg separator", multi_line, nl)(sonl));
 				}
 			}
-			_out
+
+			out
 		}
 
+		let start = LineNumber::new("args start line");
+		let end = LineNumber::new("args end line");
+		let multi_line = Rc::new(move |condition_context: &mut ConditionResolverContext| {
+			is_multiple_lines(condition_context, start, end)
+		});
+
+		let (children, end_comments) = children_between::<Arg>(
+			self.syntax().clone(),
+			self.l_paren_token().map(Into::into).as_ref(),
+			self.r_paren_token().map(Into::into).as_ref(),
+			None,
+		);
+
 		let args_items = new_line_group(gen_args(children, multi_line.clone())).into_rc_path();
 		let args_indented = with_indent(pi!(@i; nl items(args_items.into())));
 
@@ -447,6 +446,7 @@
 }
 
 impl Printable for ObjBody {
+	#[allow(clippy::too_many_lines)]
 	fn print(&self, out: &mut PrintItems) {
 		match self {
 			Self::ObjBodyComp(l) => {
@@ -507,6 +507,30 @@
 				p!(out, nl <i str("}"));
 			}
 			Self::ObjBodyMemberList(l) => {
+				fn gen_members(
+					children: Vec<Child<Member>>,
+					multi_line: ConditionResolver,
+				) -> PrintItems {
+					let mut out = PrintItems::new();
+					let mut members = children.into_iter().peekable();
+					while let Some(mem) = members.next() {
+						if mem.should_start_with_newline {
+							p!(out, nl);
+						}
+						format_comments(&mem.before_trivia, CommentLocation::AboveItem, &mut out);
+						p!(&mut out, { mem.value });
+						let has_more = members.peek().is_some();
+						if has_more {
+							p!(out, str(","));
+						} else {
+							p!(out, if("trailing comma", multi_line, str(",")));
+						}
+						format_comments(&mem.inline_trivia, CommentLocation::ItemInline, &mut out);
+						p!(out, if_else("member separator", multi_line, nl)(sonl));
+					}
+					out
+				}
+
 				let (children, end_comments) = children_between::<Member>(
 					l.syntax().clone(),
 					l.l_brace_token().map(Into::into).as_ref(),
@@ -531,31 +555,6 @@
 					})
 				};
 
-				fn gen_members(
-					children: Vec<Child<Member>>,
-					multi_line: ConditionResolver,
-				) -> PrintItems {
-					let mut _out = PrintItems::new();
-					let out = &mut _out;
-					let mut members = children.into_iter().peekable();
-					while let Some(mem) = members.next() {
-						if mem.should_start_with_newline {
-							p!(out, nl);
-						}
-						format_comments(&mem.before_trivia, CommentLocation::AboveItem, out);
-						p!(out, { mem.value });
-						let has_more = members.peek().is_some();
-						if has_more {
-							p!(out, str(","));
-						} else {
-							p!(out, if("trailing comma", multi_line, str(",")));
-						}
-						format_comments(&mem.inline_trivia, CommentLocation::ItemInline, out);
-						p!(out, if_else("member separator", multi_line, nl)(sonl));
-					}
-					_out
-				}
-
 				let members_items =
 					new_line_group(gen_members(children, multi_line.clone())).into_rc_path();
 
@@ -718,6 +717,27 @@
 
 impl Printable for ExprArray {
 	fn print(&self, out: &mut PrintItems) {
+		fn gen_elements(children: Vec<Child<Expr>>, multi_line: ConditionResolver) -> PrintItems {
+			let mut out = PrintItems::new();
+			let mut els = children.into_iter().peekable();
+			while let Some(el) = els.next() {
+				if el.should_start_with_newline {
+					p!(out, nl);
+				}
+				format_comments(&el.before_trivia, CommentLocation::AboveItem, &mut out);
+				p!(&mut out, { el.value });
+				let has_more = els.peek().is_some();
+				if has_more {
+					p!(out, str(","));
+				} else {
+					p!(out, if("trailing comma", multi_line, str(",")));
+				}
+				format_comments(&el.inline_trivia, CommentLocation::ItemInline, &mut out);
+				p!(out, if_else("element separator", multi_line, nl)(sonl));
+			}
+			out
+		}
+
 		let (children, end_comments) = children_between::<Expr>(
 			self.syntax().clone(),
 			self.l_brack_token().map(Into::into).as_ref(),
@@ -740,28 +760,6 @@
 			Rc::new(move |ctx: &mut ConditionResolverContext| is_multiple_lines(ctx, start, end))
 		};
 
-		fn gen_elements(children: Vec<Child<Expr>>, multi_line: ConditionResolver) -> PrintItems {
-			let mut _out = PrintItems::new();
-			let out = &mut _out;
-			let mut els = children.into_iter().peekable();
-			while let Some(el) = els.next() {
-				if el.should_start_with_newline {
-					p!(out, nl);
-				}
-				format_comments(&el.before_trivia, CommentLocation::AboveItem, out);
-				p!(out, { el.value });
-				let has_more = els.peek().is_some();
-				if has_more {
-					p!(out, str(","));
-				} else {
-					p!(out, if("trailing comma", multi_line, str(",")));
-				}
-				format_comments(&el.inline_trivia, CommentLocation::ItemInline, out);
-				p!(out, if_else("element separator", multi_line, nl)(sonl))
-			}
-			_out
-		}
-
 		let els_items = new_line_group(gen_elements(children, multi_line.clone())).into_rc_path();
 
 		let els = with_indent_eoi(multi_line, els_items.into(), end_comments);
@@ -800,7 +798,7 @@
 			Self::ExprString(s) => p!(out, { s.text() }),
 			Self::ExprNumber(n) => p!(out, { n.number() }),
 			Self::ExprArray(a) => {
-				p!(out, { a })
+				p!(out, { a });
 			}
 			Self::ExprObject(obj) => {
 				p!(out, { obj.obj_body() });
@@ -860,6 +858,11 @@
 	// 0 for hard tabs
 	pub indent: u8,
 }
+
+#[allow(
+	clippy::result_large_err,
+	reason = "TODO: there should be an intermediate representation for such reports"
+)]
 pub fn format(input: &str, opts: &FormatOptions) -> Result<String, SnippetBuilder> {
 	let (parsed, errors) = jrsonnet_rowan_parser::parse(input);
 	if !errors.is_empty() {
--- a/crates/jrsonnet-macros/src/typed.rs
+++ b/crates/jrsonnet-macros/src/typed.rs
@@ -156,7 +156,7 @@
 		// optional flatten is handled in same way as serde
 		if self.attr.flatten {
 			return quote! {
-				#ident: <#ty as TypedObj>::parse(&obj).ok(),
+				#ident: <#ty as ParseTypedObj>::parse(&obj).ok(),
 			};
 		}
 
@@ -190,7 +190,7 @@
 		// optional flatten is handled in same way as serde
 		if self.attr.flatten {
 			return quote! {
-				#ident: <#ty as TypedObj>::parse(&obj)?,
+				#ident: <#ty as ParseTypedObj>::parse(&obj)?,
 			};
 		}
 
@@ -232,12 +232,12 @@
 				if self.is_option {
 					quote! {
 						if let Some(value) = self.#ident {
-							<#ty as TypedObj>::serialize(value, out)?;
+							<#ty as SerializeTypedObj>::serialize(value, out)?;
 						}
 					}
 				} else {
 					quote! {
-						<#ty as TypedObj>::serialize(self.#ident, out)?;
+						<#ty as SerializeTypedObj>::serialize(self.#ident, out)?;
 					}
 				}
 			},
--- a/crates/jrsonnet-parser/src/expr.rs
+++ b/crates/jrsonnet-parser/src/expr.rs
@@ -224,7 +224,8 @@
 	},
 	#[cfg(feature = "exp-destruct")]
 	Object {
-		fields: Vec<(IStr, Option<Destruct>, Option<Spanned<Expr>>)>,
+		#[allow(clippy::type_complexity)]
+		fields: Vec<(IStr, Option<Destruct>, Option<Rc<Spanned<Expr>>>)>,
 		rest: Option<DestructRest>,
 	},
 }
@@ -261,7 +262,7 @@
 				let mut out = 0;
 				for (_, into, _) in fields {
 					match into {
-						Some(v) => out += v.capacity_hint(),
+						Some(v) => out += v.binds_len(),
 						// Field is destructured to default name
 						None => out += 1,
 					}
--- a/crates/jrsonnet-parser/src/lib.rs
+++ b/crates/jrsonnet-parser/src/lib.rs
@@ -119,7 +119,7 @@
 			}
 		pub rule destruct_object(s: &ParserSettings) -> expr::Destruct
 			= "{" _
-				fields:(name:id() into:(_ ":" _ into:destruct(s) {into})? default:(_ "=" _ v:expr(s) {v})? {(name, into, default)})**comma()
+				fields:(name:id() into:(_ ":" _ into:destruct(s) {into})? default:(_ "=" _ v:expr(s) {v})? {(name, into, default.map(Rc::new))})**comma()
 				rest:(
 					comma() rest:destruct_rest()? {rest}
 					/ comma()? {None}
--- a/crates/jrsonnet-rowan-parser/src/ast.rs
+++ b/crates/jrsonnet-rowan-parser/src/ast.rs
@@ -2,8 +2,9 @@
 
 use crate::{SyntaxKind, SyntaxNode, SyntaxNodeChildren, SyntaxToken};
 
-/// The main trait to go from untyped `SyntaxNode`  to a typed ast. The
-/// conversion itself has zero runtime cost: ast and syntax nodes have exactly
+/// The main trait to go from untyped `SyntaxNode`  to a typed ast.
+///
+/// The conversion itself has zero runtime cost: ast and syntax nodes have exactly
 /// the same representation: a pointer to the tree root and a pointer to the
 /// node itself.
 pub trait AstNode {
--- a/crates/jrsonnet-rowan-parser/src/event.rs
+++ b/crates/jrsonnet-rowan-parser/src/event.rs
@@ -56,7 +56,7 @@
 	fn text_offset(&self) -> TextSize {
 		if self.offset == 0 {
 			return 0.into();
-		};
+		}
 		self.lexemes.get(self.offset).map_or_else(
 			|| {
 				self.lexemes
--- a/crates/jrsonnet-rowan-parser/src/lib.rs
+++ b/crates/jrsonnet-rowan-parser/src/lib.rs
@@ -26,7 +26,7 @@
 
 use self::{
 	ast::support,
-	generated::nodes::{Expr, ExprBinary, ExprObjExtend},
+	generated::nodes::{Expr, ExprObjExtend},
 };
 
 pub fn parse(input: &str) -> (SourceFile, Vec<LocatedSyntaxError>) {
--- a/crates/jrsonnet-rowan-parser/src/marker.rs
+++ b/crates/jrsonnet-rowan-parser/src/marker.rs
@@ -141,7 +141,7 @@
 		new_m
 	}
 	/// Create new node around existing marker
-	/// If previous_pos is set - the wrapping node would not include everything that happened between wrapped node end and the current position of the parser
+	/// If `previous_pos` is set - the wrapping node would not include everything that happened between wrapped node end and the current position of the parser
 	fn wrap_raw(
 		self,
 		p: &mut Parser,
--- a/crates/jrsonnet-rowan-parser/src/parser.rs
+++ b/crates/jrsonnet-rowan-parser/src/parser.rs
@@ -52,8 +52,7 @@
 				write!(f, "unexpected {found:?}, expecting {expected}")
 			}
 			SyntaxError::Missing { expected } => write!(f, "missing {expected}"),
-			SyntaxError::Custom { error } => write!(f, "{error}"),
-			SyntaxError::Hint { error } => write!(f, "{error}"),
+			SyntaxError::Custom { error } | SyntaxError::Hint { error } => write!(f, "{error}"),
 		}
 	}
 }
@@ -492,7 +491,7 @@
 			} else {
 				m.complete(p, MEMBER_FIELD_NORMAL)
 			};
-		};
+		}
 		while p.at_ts(COMPSPEC) {
 			compspecs.push(compspec(p));
 		}
@@ -747,7 +746,7 @@
 	if p.at(T![:]) {
 		p.bump();
 		destruct(p);
-	};
+	}
 	if p.at(T![=]) {
 		p.bump();
 		expr(p);
--- a/crates/jrsonnet-rowan-parser/src/string_block.rs
+++ b/crates/jrsonnet-rowan-parser/src/string_block.rs
@@ -11,7 +11,7 @@
 
 use crate::SyntaxKind;
 
-pub(crate) fn lex_str_block_test<'d>(lex: &mut Lexer<'d, SyntaxKind>) {
+pub(crate) fn lex_str_block_test(lex: &mut Lexer<'_, SyntaxKind>) {
 	let _ = lex_str_block(lex);
 }
 
@@ -48,7 +48,7 @@
 	}
 
 	fn eat_if(&mut self, f: impl Fn(char) -> bool) -> usize {
-		if self.peek().map(f).unwrap_or(false) {
+		if self.peek().is_some_and(f) {
 			self.index += 1;
 			return 1;
 		}
@@ -141,9 +141,7 @@
 	}
 }
 
-pub fn collect_lexed_str_block<'s>(
-	input: &'s str,
-) -> Result<CollectStrBlock<'s>, StringBlockError> {
+pub fn collect_lexed_str_block(input: &str) -> Result<CollectStrBlock<'_>, StringBlockError> {
 	let mut collect = CollectStrBlock {
 		truncate: false,
 		lines: vec![],
@@ -179,7 +177,7 @@
 	}
 
 	fn mark_line(&mut self, line: &'d str) {
-		self.lines.push(line)
+		self.lines.push(line);
 	}
 }
 
--- a/crates/jrsonnet-rowan-parser/src/tests.rs
+++ b/crates/jrsonnet-rowan-parser/src/tests.rs
@@ -2,7 +2,6 @@
 #![cfg(test)]
 
 use hi_doc::{Formatting, SnippetBuilder, Text};
-use thiserror::Error;
 
 use crate::{parse, AstNode};
 
@@ -14,7 +13,7 @@
 	if !errors.is_empty() && !text.is_empty() {
 		writeln!(out, "===").unwrap();
 		for err in &errors {
-			writeln!(out, "{:?}", err).unwrap();
+			writeln!(out, "{err:?}").unwrap();
 		}
 		let mut code = text.to_string();
 
--- a/crates/jrsonnet-stdlib/src/regex.rs
+++ b/crates/jrsonnet-stdlib/src/regex.rs
@@ -4,7 +4,7 @@
 use jrsonnet_evaluator::{
 	error::{ErrorKind::*, Result},
 	rustc_hash::FxBuildHasher,
-	typed::Typed,
+	typed::{IntoUntyped, Typed},
 	val::StrValue,
 	IStr, ObjValue, ObjValueBuilder,
 };
@@ -41,7 +41,7 @@
 	}
 }
 
-#[derive(Typed)]
+#[derive(Typed, IntoUntyped)]
 pub struct RegexMatch {
 	string: IStr,
 	captures: Vec<IStr>,
--- a/tests/tests/common.rs
+++ b/tests/tests/common.rs
@@ -41,6 +41,7 @@
 }
 
 #[builtin]
+#[allow(dead_code)]
 fn assert_throw(lazy: Thunk<Val>, message: String) -> Result<bool> {
 	match lazy.evaluate() {
 		Ok(_) => {
@@ -55,6 +56,7 @@
 }
 
 #[builtin]
+#[allow(dead_code)]
 fn param_names(fun: FuncVal) -> Vec<String> {
 	fun.params()
 		.iter()
--- a/tests/tests/typed_obj.rs
+++ b/tests/tests/typed_obj.rs
@@ -9,7 +9,7 @@
 };
 use jrsonnet_stdlib::ContextInitializer;
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct A {
 	a: u32,
 	b: u16,
@@ -39,7 +39,7 @@
 	Ok(())
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct B {
 	a: u32,
 	#[typed(rename = "c")]
@@ -62,7 +62,7 @@
 	Ok(())
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct ObjectKind {
 	#[typed(rename = "apiVersion")]
 	api_version: String,
@@ -70,7 +70,7 @@
 	kind: String,
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct Object {
 	#[typed(flatten)]
 	kind: ObjectKind,
@@ -104,7 +104,7 @@
 	Ok(())
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct C {
 	a: Option<u32>,
 	b: u16,
@@ -142,14 +142,14 @@
 	Ok(())
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct D {
 	#[typed(flatten(ok))]
 	e: Option<E>,
 	b: u16,
 }
 
-#[derive(Clone, Typed, PartialEq, Debug)]
+#[derive(Clone, Typed, FromUntyped, IntoUntyped, PartialEq, Debug)]
 struct E {
 	v: u32,
 }
--- a/xtask/src/sourcegen/mod.rs
+++ b/xtask/src/sourcegen/mod.rs
@@ -65,9 +65,9 @@
 							is_lexer_error: true,
 						});
 					}
-				};
+				}
 				continue;
-			};
+			}
 			let name = to_upper_snake_case(token);
 			eprintln!("implicit kw: {token}");
 			kinds.define_token(TokenKind::Keyword {
@@ -447,7 +447,7 @@
 			let trait_name = format_ident!("{}", trait_name);
 			let kinds: Vec<_> = nodes
 				.iter()
-				.map(|name| format_ident!("{}", to_upper_snake_case(&name.name.to_string())))
+				.map(|name| format_ident!("{}", to_upper_snake_case(&name.name)))
 				.collect();
 
 			(
@@ -555,10 +555,10 @@
 	if "{}[]()$".contains(token) {
 		let c = token.chars().next().unwrap();
 		quote! { #c }
-	} else if token.contains(|v| v == '$') {
+	} else if token.contains('$') {
 		quote! { #token }
-	} else if token.chars().all(|v| ('a'..='z').contains(&v)) {
-		let i = Ident::new(&token, Span::call_site());
+	} else if token.chars().all(|v: char| v.is_ascii_lowercase()) {
+		let i = Ident::new(token, Span::call_site());
 		quote! { #i }
 	} else {
 		let cs = token.chars().map(|c| Punct::new(c, Spacing::Joint));