git.delta.rocks / jrsonnet / refs/commits / 84f648e78329

difftreelog

refact: simplify error management

Лач2020-07-21parent: #370c615.patch.diff
in: master

18 files changed

modifiedbindings/jsonnet/src/import.rsdiffbeforeafterboth
--- a/bindings/jsonnet/src/import.rs
+++ b/bindings/jsonnet/src/import.rs
@@ -1,7 +1,8 @@
 //! Import resolution manipulation utilities
 
 use jrsonnet_evaluator::{
-	create_error, create_error_result, Error, EvaluationState, ImportResolver, Result,
+	error::{Error::*, Result},
+	throw, EvaluationState, ImportResolver,
 };
 use std::{
 	any::Any,
@@ -55,10 +56,9 @@
 		let result_str = result_raw.to_str().unwrap();
 		assert!(success == 0 || success == 1);
 		if success == 0 {
+			unsafe { CString::from_raw(result_ptr) };
 			let result = result_str.to_owned();
-			let err = Err(create_error(Error::ImportCallbackError(result)));
-			unsafe { CString::from_raw(result_ptr) };
-			return err;
+			throw!(ImportCallbackError(result));
 		}
 
 		let found_here_raw = unsafe { CStr::from_ptr(found_here) };
@@ -121,15 +121,14 @@
 					return Ok(Rc::new(cloned));
 				}
 			}
-			create_error_result(Error::ImportFileNotFound(from.clone(), path.clone()))
+			throw!(ImportFileNotFound(from.clone(), path.clone()))
 		}
 	}
 	fn load_file_contents(&self, id: &PathBuf) -> Result<Rc<str>> {
-		let mut file =
-			File::open(id).map_err(|_e| create_error(Error::ResolvedFileNotFound(id.clone())))?;
+		let mut file = File::open(id).map_err(|_e| ResolvedFileNotFound(id.clone()))?;
 		let mut out = String::new();
 		file.read_to_string(&mut out)
-			.map_err(|_e| create_error(Error::ImportBadFileUtf8(id.clone())))?;
+			.map_err(|_e| ImportBadFileUtf8(id.clone()))?;
 		Ok(out.into())
 	}
 	unsafe fn as_any(&self) -> &dyn Any {
modifiedcmds/jrsonnet/src/main.rsdiffbeforeafterboth
--- a/cmds/jrsonnet/src/main.rs
+++ b/cmds/jrsonnet/src/main.rs
@@ -1,6 +1,6 @@
 use clap::Clap;
 use jrsonnet_cli::{ConfigureState, GeneralOpts, InputOpts, ManifestOpts};
-use jrsonnet_evaluator::{EvaluationState, Result};
+use jrsonnet_evaluator::{error::Result, EvaluationState};
 use std::{path::PathBuf, rc::Rc};
 
 #[global_allocator]
modifiedcrates/jrsonnet-cli/src/ext.rsdiffbeforeafterboth
--- a/crates/jrsonnet-cli/src/ext.rs
+++ b/crates/jrsonnet-cli/src/ext.rs
@@ -1,6 +1,6 @@
 use crate::ConfigureState;
 use clap::Clap;
-use jrsonnet_evaluator::{EvaluationState, Result};
+use jrsonnet_evaluator::{error::Result, EvaluationState};
 use std::str::FromStr;
 
 #[derive(Clone)]
modifiedcrates/jrsonnet-cli/src/lib.rsdiffbeforeafterboth
--- a/crates/jrsonnet-cli/src/lib.rs
+++ b/crates/jrsonnet-cli/src/lib.rs
@@ -9,7 +9,7 @@
 pub use trace::*;
 
 use clap::Clap;
-use jrsonnet_evaluator::{EvaluationState, FileImportResolver, Result};
+use jrsonnet_evaluator::{error::Result, EvaluationState, FileImportResolver};
 use std::path::PathBuf;
 
 pub trait ConfigureState {
modifiedcrates/jrsonnet-cli/src/manifest.rsdiffbeforeafterboth
--- a/crates/jrsonnet-cli/src/manifest.rs
+++ b/crates/jrsonnet-cli/src/manifest.rs
@@ -1,6 +1,6 @@
 use crate::ConfigureState;
 use clap::Clap;
-use jrsonnet_evaluator::{EvaluationState, ManifestFormat, Result};
+use jrsonnet_evaluator::{error::Result, EvaluationState, ManifestFormat};
 use std::str::FromStr;
 
 pub enum ManifestFormatName {
modifiedcrates/jrsonnet-cli/src/tla.rsdiffbeforeafterboth
--- a/crates/jrsonnet-cli/src/tla.rs
+++ b/crates/jrsonnet-cli/src/tla.rs
@@ -1,6 +1,6 @@
 use crate::{ConfigureState, ExtStr};
 use clap::Clap;
-use jrsonnet_evaluator::{EvaluationState, Result};
+use jrsonnet_evaluator::{error::Result, EvaluationState};
 
 #[derive(Clap)]
 // #[clap(help_heading = "TOP LEVEL ARGUMENTS")]
modifiedcrates/jrsonnet-cli/src/trace.rsdiffbeforeafterboth
--- a/crates/jrsonnet-cli/src/trace.rs
+++ b/crates/jrsonnet-cli/src/trace.rs
@@ -1,8 +1,9 @@
 use crate::ConfigureState;
 use clap::Clap;
 use jrsonnet_evaluator::{
+	error::Result,
 	trace::{CompactFormat, ExplainingFormat, PathResolver},
-	EvaluationState, Result,
+	EvaluationState,
 };
 use std::str::FromStr;
 
modifiedcrates/jrsonnet-evaluator/src/builtin/format.rsdiffbeforeafterboth
before · crates/jrsonnet-evaluator/src/builtin/format.rs
1//! faster std.format impl2#![allow(clippy::too_many_arguments)]34use crate::{5	create_error, create_error_result, to_string, Error, LocError, ObjValue, Val, ValType,6};78#[derive(Debug)]9pub enum FormatError {10	TruncatedFormatCode,11	UnrecognizedConversionType(char),12	ValueError(LocError),1314	NotEnoughValues,1516	CannotUseStarWidthWithObject,17	MappingKeysRequired,18	NoSuchField(Rc<str>),19}20impl From<LocError> for FormatError {21	fn from(e: LocError) -> Self {22		Self::ValueError(e)23	}24}25use std::rc::Rc;26use FormatError::*;2728pub fn try_parse_mapping_key(str: &str) -> Result<(&str, &str), FormatError> {29	if str.is_empty() {30		return Err(TruncatedFormatCode);31	}32	let bytes = str.as_bytes();33	if bytes[0] == b'(' {34		let mut i = 1;35		while i < bytes.len() {36			if bytes[i] == b')' {37				return Ok((&str[1..i as usize], &str[i as usize + 1..]));38			}39			i += 1;40		}41		Err(TruncatedFormatCode)42	} else {43		Ok(("", str))44	}45}4647#[cfg(test)]48pub mod tests_key {49	use super::*;5051	#[test]52	fn parse_key() {53		assert_eq!(54			try_parse_mapping_key("(hello ) world").unwrap(),55			("hello ", " world")56		);57		assert_eq!(try_parse_mapping_key("() world").unwrap(), ("", " world"));58		assert_eq!(try_parse_mapping_key(" world").unwrap(), ("", " world"));59		assert_eq!(60			try_parse_mapping_key(" () world").unwrap(),61			("", " () world")62		);63	}6465	#[test]66	#[should_panic]67	fn parse_key_missing_start() {68		try_parse_mapping_key("").unwrap();69	}7071	#[test]72	#[should_panic]73	fn parse_key_missing_end() {74		try_parse_mapping_key("(   ").unwrap();75	}76}7778#[derive(Default, Debug)]79pub struct CFlags {80	pub alt: bool,81	pub zero: bool,82	pub left: bool,83	pub blank: bool,84	pub sign: bool,85}8687pub fn try_parse_cflags(str: &str) -> Result<(CFlags, &str), FormatError> {88	if str.is_empty() {89		return Err(TruncatedFormatCode);90	}91	let bytes = str.as_bytes();92	let mut i = 0;93	let mut out = CFlags::default();94	loop {95		if bytes.len() == i {96			return Err(TruncatedFormatCode);97		}98		match bytes[i] {99			b'#' => out.alt = true,100			b'0' => out.zero = true,101			b'-' => out.left = true,102			b' ' => out.blank = true,103			b'+' => out.sign = true,104			_ => break,105		}106		i += 1;107	}108	Ok((out, &str[i..]))109}110111#[derive(Debug, PartialEq)]112pub enum Width {113	Star,114	Fixed(usize),115}116pub fn try_parse_field_width(str: &str) -> Result<(Width, &str), FormatError> {117	if str.is_empty() {118		return Err(TruncatedFormatCode);119	}120	let bytes = str.as_bytes();121	if bytes[0] == b'*' {122		return Ok((Width::Star, &str[1..]));123	}124	let mut out: usize = 0;125	let mut digits = 0;126	while let Some(digit) = (bytes[digits] as char).to_digit(10) {127		out *= 10;128		out += digit as usize;129		digits += 1;130		if digits == bytes.len() {131			return Err(TruncatedFormatCode);132		}133	}134	Ok((Width::Fixed(out), &str[digits..]))135}136137pub fn try_parse_precision(str: &str) -> Result<(Option<Width>, &str), FormatError> {138	if str.is_empty() {139		return Err(TruncatedFormatCode);140	}141	let bytes = str.as_bytes();142	if bytes[0] == b'.' {143		try_parse_field_width(&str[1..]).map(|(r, s)| (Some(r), s))144	} else {145		Ok((None, str))146	}147}148149// Only skips150pub fn try_parse_length_modifier(str: &str) -> Result<&str, FormatError> {151	if str.is_empty() {152		return Err(TruncatedFormatCode);153	}154	let bytes = str.as_bytes();155	let mut idx = 0;156	while bytes[idx] == b'h' || bytes[idx] == b'l' || bytes[idx] == b'L' {157		idx += 1;158		if bytes.len() == idx {159			return Err(TruncatedFormatCode);160		}161	}162	Ok(&str[idx..])163}164165#[derive(Debug)]166pub enum ConvTypeV {167	Decimal,168	Octal,169	Hexadecimal,170	Scientific,171	Float,172	Shorter,173	Char,174	String,175	Percent,176}177pub struct ConvType {178	v: ConvTypeV,179	caps: bool,180}181182pub fn parse_conversion_type(str: &str) -> Result<(ConvType, &str), FormatError> {183	if str.is_empty() {184		return Err(TruncatedFormatCode);185	}186187	let code = str.as_bytes()[0];188	let v: (ConvTypeV, bool) = match code {189		b'd' | b'i' | b'u' => (ConvTypeV::Decimal, false),190		b'o' => (ConvTypeV::Octal, false),191		b'x' => (ConvTypeV::Hexadecimal, false),192		b'X' => (ConvTypeV::Hexadecimal, true),193		b'e' => (ConvTypeV::Scientific, false),194		b'E' => (ConvTypeV::Scientific, true),195		b'f' => (ConvTypeV::Float, false),196		b'F' => (ConvTypeV::Float, true),197		b'g' => (ConvTypeV::Shorter, false),198		b'G' => (ConvTypeV::Shorter, true),199		b'c' => (ConvTypeV::Char, false),200		b's' => (ConvTypeV::String, false),201		b'%' => (ConvTypeV::Percent, false),202		c => return Err(UnrecognizedConversionType(c as char)),203	};204205	Ok((ConvType { v: v.0, caps: v.1 }, &str[1..]))206}207208#[derive(Debug)]209pub struct Code<'s> {210	mkey: &'s str,211	cflags: CFlags,212	width: Width,213	precision: Option<Width>,214	convtype: ConvTypeV,215	caps: bool,216}217pub fn parse_code(str: &str) -> Result<(Code, &str), FormatError> {218	if str.is_empty() {219		return Err(TruncatedFormatCode);220	}221	let (mkey, str) = try_parse_mapping_key(str)?;222	let (cflags, str) = try_parse_cflags(str)?;223	let (width, str) = try_parse_field_width(str)?;224	let (precision, str) = try_parse_precision(str)?;225	let str = try_parse_length_modifier(str)?;226	let (convtype, str) = parse_conversion_type(str)?;227228	Ok((229		Code {230			mkey,231			cflags,232			width,233			precision,234			convtype: convtype.v,235			caps: convtype.caps,236		},237		str,238	))239}240241#[derive(Debug)]242pub enum Element<'s> {243	String(&'s str),244	Code(Code<'s>),245}246pub fn parse_codes(mut str: &str) -> Result<Vec<Element>, FormatError> {247	let mut bytes = str.as_bytes();248	let mut out = vec![];249	let mut offset = 0;250251	loop {252		while offset != bytes.len() && bytes[offset] != b'%' {253			offset += 1;254		}255		if offset != 0 {256			out.push(Element::String(&str[0..offset]));257		}258		if offset == bytes.len() {259			return Ok(out);260		}261		str = &str[offset + 1..];262		let (code, nstr) = parse_code(str)?;263		str = nstr;264		bytes = str.as_bytes();265		offset = 0;266267		out.push(Element::Code(code))268	}269}270271const NUMBERS: &[u8] = b"0123456789abcdefghijklmnopqrstuvwxyz";272273#[inline]274pub fn render_integer(275	out: &mut String,276	iv: i64,277	padding: usize,278	precision: usize,279	blank: bool,280	sign: bool,281	radix: i64,282	prefix: &str,283	caps: bool,284) {285	// Digit char indexes in reverse order, i.e286	// for radix = 16 and n = 12f: [15, 2, 1]287	let digits = if iv == 0 {288		vec![0u8]289	} else {290		let mut v = iv.abs();291		let mut nums = Vec::with_capacity(1);292		while v > 0 {293			nums.push((v % radix) as u8);294			v /= radix;295		}296		nums297	};298	let neg = iv < 0;299	let zp = padding.saturating_sub(if neg || blank || sign { 1 } else { 0 });300	let zp2 = zp301		.max(precision)302		.saturating_sub(prefix.len() + digits.len());303304	if neg {305		out.push('-')306	} else if sign {307		out.push('+');308	} else if blank {309		out.push(' ');310	}311312	out.reserve(zp2);313	for _ in 0..zp2 {314		out.push('0');315	}316	out.push_str(&prefix);317318	for digit in digits.into_iter().rev() {319		let ch = NUMBERS[digit as usize] as char;320		out.push(if caps { ch.to_ascii_uppercase() } else { ch });321	}322}323324pub fn render_decimal(325	out: &mut String,326	iv: i64,327	padding: usize,328	precision: usize,329	blank: bool,330	sign: bool,331) {332	render_integer(out, iv, padding, precision, blank, sign, 10, "", false)333}334pub fn render_octal(335	out: &mut String,336	iv: i64,337	padding: usize,338	precision: usize,339	alt: bool,340	blank: bool,341	sign: bool,342) {343	render_integer(344		out,345		iv,346		padding,347		precision,348		blank,349		sign,350		8,351		if alt && iv != 0 { "0" } else { "" },352		false,353	)354}355pub fn render_hexadecimal(356	out: &mut String,357	iv: i64,358	padding: usize,359	precision: usize,360	alt: bool,361	blank: bool,362	sign: bool,363	caps: bool,364) {365	render_integer(366		out,367		iv,368		padding,369		precision,370		blank,371		sign,372		16,373		match (alt, caps) {374			(true, true) => "0X",375			(true, false) => "0x",376			(false, _) => "",377		},378		caps,379	)380}381382pub fn render_float(383	out: &mut String,384	n: f64,385	mut padding: usize,386	precision: usize,387	blank: bool,388	sign: bool,389	ensure_pt: bool,390	trailing: bool,391) {392	let dot_size = if precision == 0 && !ensure_pt { 0 } else { 1 };393	padding = padding.saturating_sub(dot_size + precision);394	render_decimal(out, n.floor() as i64, padding, 0, blank, sign);395	if precision == 0 {396		if ensure_pt {397			out.push('.');398		}399		return;400	}401	let frac = (n.fract() * 10.0_f64.powf(precision as f64) + 0.5).floor();402	if trailing || frac > 0.0 {403		out.push('.');404		let mut frac_str = String::new();405		render_decimal(&mut frac_str, frac as i64, precision, 0, false, false);406		let mut trim = frac_str.len();407		if !trailing {408			for b in frac_str.as_bytes().iter().rev() {409				if *b == b'0' {410					trim -= 1;411				}412			}413		}414		out.push_str(&frac_str[..trim]);415	} else if ensure_pt {416		out.push('.');417	}418}419420pub fn render_float_sci(421	out: &mut String,422	n: f64,423	mut padding: usize,424	precision: usize,425	blank: bool,426	sign: bool,427	ensure_pt: bool,428	trailing: bool,429	caps: bool,430) {431	let exponent = n.log10().floor();432	let mantissa = if exponent as i16 == -324 {433		n * 10.0 / 10.0_f64.powf(exponent + 1.0)434	} else {435		n / 10.0_f64.powf(exponent)436	};437	let mut exponent_str = String::new();438	render_decimal(&mut exponent_str, exponent as i64, 3, 0, false, true);439440	// +1 for e441	padding = padding.saturating_sub(exponent_str.len() + 1);442443	render_float(444		out, mantissa, padding, precision, blank, sign, ensure_pt, trailing,445	);446	out.push(if caps { 'E' } else { 'e' });447	out.push_str(&exponent_str);448}449450pub fn format_code(451	out: &mut String,452	value: &Val,453	code: &Code,454	width: usize,455	precision: Option<usize>,456) -> Result<(), FormatError> {457	let clfags = &code.cflags;458	let (fpprec, iprec) = match precision {459		Some(v) => (v, v),460		None => (6, 0),461	};462	let padding = if clfags.zero && !clfags.left {463		width464	} else {465		0466	};467468	// TODO: If left padded, can optimize by writing directly to out469	let mut tmp_out = String::new();470471	match code.convtype {472		ConvTypeV::String => tmp_out.push_str(&to_string(value)?),473		ConvTypeV::Decimal => {474			let value = value.clone().try_cast_num("%d/%u/%i requires number")?;475			render_decimal(476				&mut tmp_out,477				value as i64,478				padding,479				iprec,480				clfags.blank,481				clfags.sign,482			);483		}484		ConvTypeV::Octal => {485			let value = value.clone().try_cast_num("%o requires number")?;486			render_octal(487				&mut tmp_out,488				value as i64,489				padding,490				iprec,491				clfags.alt,492				clfags.blank,493				clfags.sign,494			);495		}496		ConvTypeV::Hexadecimal => {497			let value = value.clone().try_cast_num("%x/%X requires number")?;498			render_hexadecimal(499				&mut tmp_out,500				value as i64,501				padding,502				iprec,503				clfags.alt,504				clfags.blank,505				clfags.sign,506				code.caps,507			);508		}509		ConvTypeV::Scientific => {510			let value = value.clone().try_cast_num("%e/%E requires number")?;511			render_float_sci(512				&mut tmp_out,513				value,514				padding,515				fpprec,516				clfags.blank,517				clfags.sign,518				clfags.alt,519				true,520				code.caps,521			);522		}523		ConvTypeV::Float => {524			let value = value.clone().try_cast_num("%e/%E requires number")?;525			render_float(526				&mut tmp_out,527				value,528				padding,529				fpprec,530				clfags.blank,531				clfags.sign,532				clfags.alt,533				true,534			);535		}536		ConvTypeV::Shorter => {537			let value = value.clone().try_cast_num("%g/%G requires number")?;538			let exponent = value.log10().floor();539			if exponent < -4.0 || exponent >= fpprec as f64 {540				render_float_sci(541					&mut tmp_out,542					value,543					padding,544					fpprec - 1,545					clfags.blank,546					clfags.sign,547					clfags.alt,548					clfags.alt,549					code.caps,550				);551			} else {552				let digits_before_pt = 1.max(exponent as usize + 1);553				render_float(554					&mut tmp_out,555					value,556					padding,557					fpprec - digits_before_pt,558					clfags.blank,559					clfags.sign,560					clfags.alt,561					clfags.alt,562				);563			}564		}565		ConvTypeV::Char => match value.clone().unwrap_if_lazy()? {566			Val::Num(n) => tmp_out.push(567				std::char::from_u32(n as u32)568					.ok_or_else(|| create_error(Error::InvalidUnicodeCodepointGot(n as u32)))?,569			),570			Val::Str(s) => {571				if s.chars().count() != 1 {572					create_error_result(Error::RuntimeError(573						format!("%c expected 1 char string, got {}", s.chars().count()).into(),574					))?;575				}576				tmp_out.push_str(&s);577			}578			_ => {579				create_error_result(Error::TypeMismatch(580					"%c requires number/string",581					vec![ValType::Num, ValType::Str],582					value.value_type()?,583				))?;584			}585		},586		ConvTypeV::Percent => tmp_out.push('%'),587	};588589	let padding = width.saturating_sub(tmp_out.len());590591	if !clfags.left {592		for _ in 0..padding {593			out.push(' ');594		}595	}596	out.push_str(&tmp_out);597	if clfags.left {598		for _ in 0..padding {599			out.push(' ');600		}601	}602603	Ok(())604}605606pub fn format_arr(str: &str, mut values: &[Val]) -> Result<String, FormatError> {607	let codes = parse_codes(&str)?;608	let mut out = String::new();609610	for code in codes {611		match code {612			Element::String(s) => {613				out.push_str(s);614			}615			Element::Code(c) => {616				let width = match c.width {617					Width::Star => {618						if values.is_empty() {619							return Err(FormatError::NotEnoughValues);620						}621						let value = &values[0];622						values = &values[1..];623						value.clone().try_cast_num("field width")? as usize624					}625					Width::Fixed(n) => n,626				};627				let precision = match c.precision {628					Some(Width::Star) => {629						if values.is_empty() {630							return Err(FormatError::NotEnoughValues);631						}632						let value = &values[0];633						values = &values[1..];634						Some(value.clone().try_cast_num("field precision")? as usize)635					}636					Some(Width::Fixed(n)) => Some(n),637					None => None,638				};639640				// %% should not consume a value641				let value = if c.convtype == ConvTypeV::Percent {642					&Val::Null643				} else {644					if values.is_empty() {645						return Err(FormatError::NotEnoughValues);646					}647					let value = &values[0];648					values = &values[1..];649					value650				};651652				format_code(&mut out, value, &c, width, precision)?;653			}654		}655	}656657	Ok(out)658}659660pub fn format_obj(str: &str, values: &ObjValue) -> Result<String, FormatError> {661	let codes = parse_codes(&str)?;662	let mut out = String::new();663664	for code in codes {665		match code {666			Element::String(s) => {667				out.push_str(s);668			}669			Element::Code(c) => {670				// TODO: Operate on ref671				let f: Rc<str> = c.mkey.into();672				if f.is_empty() {673					return Err(FormatError::MappingKeysRequired);674				}675				let width = match c.width {676					Width::Star => {677						return Err(FormatError::CannotUseStarWidthWithObject);678					}679					Width::Fixed(n) => n,680				};681				let precision = match c.precision {682					Some(Width::Star) => {683						return Err(FormatError::CannotUseStarWidthWithObject);684					}685					Some(Width::Fixed(n)) => Some(n),686					None => None,687				};688				let value = if let Some(v) = values.get(f.clone())? {689					v690				} else {691					return Err(FormatError::NoSuchField(f));692				};693694				format_code(&mut out, &value, &c, width, precision)?;695			}696		}697	}698699	Ok(out)700}701702#[cfg(test)]703pub mod test_format {704	use super::*;705706	#[test]707	fn parse() {708		assert_eq!(709			parse_codes(710				"How much error budget is left looking at our %.3f%% availability gurantees?"711			)712			.unwrap()713			.len(),714			4715		);716	}717718	#[test]719	fn octals() {720		assert_eq!(format_arr("%#o", &[Val::Num(8.0)]).unwrap(), "010");721		assert_eq!(format_arr("%#4o", &[Val::Num(8.0)]).unwrap(), " 010");722		assert_eq!(format_arr("%4o", &[Val::Num(8.0)]).unwrap(), "  10");723		assert_eq!(format_arr("%04o", &[Val::Num(8.0)]).unwrap(), "0010");724		assert_eq!(format_arr("%+4o", &[Val::Num(8.0)]).unwrap(), " +10");725		assert_eq!(format_arr("%+04o", &[Val::Num(8.0)]).unwrap(), "+010");726		assert_eq!(format_arr("%-4o", &[Val::Num(8.0)]).unwrap(), "10  ");727		assert_eq!(format_arr("%+-4o", &[Val::Num(8.0)]).unwrap(), "+10 ");728		assert_eq!(format_arr("%+-04o", &[Val::Num(8.0)]).unwrap(), "+10 ");729	}730731	#[test]732	fn percent_doesnt_consumes_values() {733		assert_eq!(734			format_arr(735				"How much error budget is left looking at our %.3f%% availability gurantees?",736				&[Val::Num(4.0)]737			)738			.unwrap(),739			"How much error budget is left looking at our 4.000% availability gurantees?"740		);741	}742}
modifiedcrates/jrsonnet-evaluator/src/ctx.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/ctx.rs
+++ b/crates/jrsonnet-evaluator/src/ctx.rs
@@ -1,5 +1,5 @@
 use crate::{
-	create_error, future_wrapper, map::LayeredHashMap, rc_fn_helper, resolved_lazy_val, Error,
+	error::Error::*, future_wrapper, map::LayeredHashMap, rc_fn_helper, resolved_lazy_val,
 	LazyBinding, LazyVal, ObjValue, Result, Val,
 };
 use std::{
@@ -61,11 +61,12 @@
 	}
 
 	pub fn binding(&self, name: Rc<str>) -> Result<LazyVal> {
-		self.0
+		Ok(self
+			.0
 			.bindings
 			.get(&name)
 			.cloned()
-			.ok_or_else(|| create_error(Error::UnknownVariable(name)))
+			.ok_or_else(|| UnknownVariable(name))?)
 	}
 	pub fn into_future(self, ctx: FutureContext) -> Context {
 		{
modifiedcrates/jrsonnet-evaluator/src/error.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/error.rs
+++ b/crates/jrsonnet-evaluator/src/error.rs
@@ -1,4 +1,4 @@
-use crate::{Val, ValType};
+use crate::{builtin::format::FormatError, Val, ValType};
 use jrsonnet_parser::{BinaryOpType, ExprLocation, UnaryOpType};
 use std::{path::PathBuf, rc::Rc};
 
@@ -61,7 +61,14 @@
 
 	ImportCallbackError(String),
 	InvalidUnicodeCodepointGot(u32),
+
+	Format(FormatError),
 }
+impl From<Error> for LocError {
+	fn from(e: Error) -> Self {
+		Self(e, StackTrace(vec![]))
+	}
+}
 
 #[derive(Clone, Debug)]
 pub struct StackTraceElement {
@@ -73,4 +80,17 @@
 
 #[derive(Debug, Clone)]
 pub struct LocError(pub Error, pub StackTrace);
+impl LocError {
+	pub fn new(e: Error) -> Self {
+		Self(e, StackTrace(vec![]))
+	}
+}
+
 pub type Result<V> = std::result::Result<V, LocError>;
+
+#[macro_export]
+macro_rules! throw {
+	($e: expr) => {
+		return Err($e.into());
+	};
+}
modifiedcrates/jrsonnet-evaluator/src/evaluate.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/evaluate.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate.rs
@@ -1,9 +1,10 @@
 use crate::{
 	builtin::format::{format_arr, format_obj},
-	context_creator, create_error, create_error_result, equals, escape_string_json, future_wrapper,
-	lazy_val, manifest_json_ex, parse_args, primitive_equals, push, with_state, Context,
-	ContextCreator, Error, FuncDesc, LazyBinding, LazyVal, ObjMember, ObjValue, Result, Val,
-	ValType,
+	context_creator, equals,
+	error::Error::*,
+	escape_string_json, future_wrapper, lazy_val, manifest_json_ex, parse_args, primitive_equals,
+	push, throw, with_state, Context, ContextCreator, FuncDesc, LazyBinding, LazyVal, LocError,
+	ObjMember, ObjValue, Result, Val, ValType,
 };
 use closure::closure;
 use jrsonnet_parser::{
@@ -11,7 +12,7 @@
 	ForSpecData, IfSpecData, LiteralType, LocExpr, Member, ObjBody, ParamsDesc, UnaryOpType,
 	Visibility,
 };
-use std::{cmp::Ordering, collections::HashMap, rc::Rc};
+use std::{cmp::Ordering, collections::HashMap, path::PathBuf, rc::Rc};
 
 pub fn evaluate_binding(b: &BindSpec, context_creator: ContextCreator) -> (Rc<str>, LazyBinding) {
 	let b = b.clone();
@@ -79,10 +80,7 @@
 		(UnaryOpType::Not, Val::Bool(v)) => Val::Bool(!v),
 		(UnaryOpType::Minus, Val::Num(n)) => Val::Num(-*n),
 		(UnaryOpType::BitNot, Val::Num(n)) => Val::Num(!(*n as i32) as f64),
-		(op, o) => create_error_result(Error::UnaryOperatorDoesNotOperateOnType(
-			op,
-			o.value_type()?,
-		))?,
+		(op, o) => throw!(UnaryOperatorDoesNotOperateOnType(op, o.value_type()?)),
 	})
 }
 
@@ -100,11 +98,11 @@
 		(Val::Obj(v1), Val::Obj(v2)) => Val::Obj(v2.with_super(v1.clone())),
 		(Val::Arr(a), Val::Arr(b)) => Val::Arr(Rc::new([&a[..], &b[..]].concat())),
 		(Val::Num(v1), Val::Num(v2)) => Val::new_checked_num(v1 + v2)?,
-		_ => create_error_result(Error::BinaryOperatorDoesNotOperateOnValues(
+		_ => throw!(BinaryOperatorDoesNotOperateOnValues(
 			BinaryOpType::Add,
 			a.value_type()?,
 			b.value_type()?,
-		))?,
+		)),
 	})
 }
 
@@ -145,7 +143,7 @@
 		(Val::Num(v1), BinaryOpType::Mul, Val::Num(v2)) => Val::new_checked_num(v1 * v2)?,
 		(Val::Num(v1), BinaryOpType::Div, Val::Num(v2)) => {
 			if *v2 <= f64::EPSILON {
-				create_error_result(crate::Error::DivisionByZero)?
+				throw!(DivisionByZero)
 			}
 			Val::new_checked_num(v1 / v2)?
 		}
@@ -168,22 +166,22 @@
 		}
 		(Val::Num(v1), BinaryOpType::Lhs, Val::Num(v2)) => {
 			if *v2 < 0.0 {
-				create_error_result(Error::RuntimeError("shift by negative exponent".into()))?
+				throw!(RuntimeError("shift by negative exponent".into()))
 			}
 			Val::Num(((*v1 as i32) << (*v2 as i32)) as f64)
 		}
 		(Val::Num(v1), BinaryOpType::Rhs, Val::Num(v2)) => {
 			if *v2 < 0.0 {
-				create_error_result(Error::RuntimeError("shift by negative exponent".into()))?
+				throw!(RuntimeError("shift by negative exponent".into()))
 			}
 			Val::Num(((*v1 as i32) >> (*v2 as i32)) as f64)
 		}
 
-		_ => create_error_result(Error::BinaryOperatorDoesNotOperateOnValues(
+		_ => throw!(BinaryOperatorDoesNotOperateOnValues(
 			op,
 			a.value_type()?,
 			b.value_type()?,
-		))?,
+		)),
 	})
 }
 
@@ -218,7 +216,7 @@
 					}
 					Some(out.into_iter().flatten().flatten().collect())
 				}
-				_ => create_error_result(Error::InComprehensionCanOnlyIterateOverArray)?,
+				_ => throw!(InComprehensionCanOnlyIterateOverArray),
 			}
 		}
 	})
@@ -379,7 +377,7 @@
 							},
 						);
 					}
-					v => create_error_result(Error::FieldMustBeStringGot(v.value_type()?))?,
+					v => throw!(FieldMustBeStringGot(v.value_type()?)),
 				}
 			}
 
@@ -409,7 +407,7 @@
 	Ok(match value {
 		Val::Intristic(ns, name) => match (&ns as &str, &name as &str) {
 			// arr/string/function
-			("std", "length") => noinline!(parse_args!(context, "std.length", args, 1, [
+			("std", "length") => parse_args!(context, "std.length", args, 1, [
 				0, x: [Val::Str|Val::Arr|Val::Obj], vec![ValType::Str, ValType::Arr, ValType::Obj];
 			], {
 				Ok(match x {
@@ -423,20 +421,20 @@
 					),
 					_ => unreachable!(),
 				})
-			}))?,
+			})?,
 			// any
 			("std", "type") => parse_args!(context, "std.type", args, 1, [
 				0, x, vec![];
 			], {
-				Val::Str(x.value_type()?.name().into())
-			}),
+				Ok(Val::Str(x.value_type()?.name().into()))
+			})?,
 			// length, idx=>any
 			("std", "makeArray") => noinline!(parse_args!(context, "std.makeArray", args, 2, [
 				0, sz: [Val::Num]!!Val::Num, vec![ValType::Num];
 				1, func: [Val::Func]!!Val::Func, vec![ValType::Func];
 			], {
 				if sz < 0.0 {
-					create_error_result(crate::error::Error::RuntimeError(format!("makeArray requires size >= 0, got {}", sz).into()))?;
+					throw!(RuntimeError(format!("makeArray requires size >= 0, got {}", sz).into()));
 				}
 				let mut out = Vec::with_capacity(sz as usize);
 				for i in 0..sz as usize {
@@ -455,8 +453,8 @@
 					str.chars().count() == 1,
 					"std.codepoint should receive single char string"
 				);
-				Val::Num(str.chars().take(1).next().unwrap() as u32 as f64)
-			}),
+				Ok(Val::Num(str.chars().take(1).next().unwrap() as u32 as f64))
+			})?,
 			// object, includeHidden
 			("std", "objectFieldsEx") => {
 				noinline!(parse_args!(context, "std.objectFieldsEx",args, 2, [
@@ -478,42 +476,42 @@
 				1, f: [Val::Str]!!Val::Str, vec![ValType::Str];
 				2, inc_hidden: [Val::Bool]!!Val::Bool, vec![ValType::Bool];
 			], {
-				Val::Bool(
+				Ok(Val::Bool(
 					obj.fields_visibility()
 						.into_iter()
 						.filter(|(_k, v)| *v || inc_hidden)
 						.any(|(k, _v)| *k == *f),
-				)
-			}),
+				))
+			})?,
 			("std", "primitiveEquals") => parse_args!(context, "std.primitiveEquals", args, 2, [
 				0, a, vec![];
 				1, b, vec![];
 			], {
-				Val::Bool(primitive_equals(&a, &b)?)
-			}),
+				Ok(Val::Bool(primitive_equals(&a, &b)?))
+			})?,
 			// faster
 			("std", "equals") => parse_args!(context, "std.equals", args, 2, [
 				0, a, vec![];
 				1, b, vec![];
 			], {
-				Val::Bool(equals(&a, &b)?)
-			}),
+				Ok(Val::Bool(equals(&a, &b)?))
+			})?,
 			("std", "modulo") => parse_args!(context, "std.modulo", args, 2, [
 				0, a: [Val::Num]!!Val::Num, vec![ValType::Num];
 				1, b: [Val::Num]!!Val::Num, vec![ValType::Num];
 			], {
-				Val::Num(a % b)
-			}),
+				Ok(Val::Num(a % b))
+			})?,
 			("std", "floor") => parse_args!(context, "std.floor", args, 1, [
 				0, x: [Val::Num]!!Val::Num, vec![ValType::Num];
 			], {
-				Val::Num(x.floor())
-			}),
+				Ok(Val::Num(x.floor()))
+			})?,
 			("std", "log") => parse_args!(context, "std.log", args, 2, [
 				0, n: [Val::Num]!!Val::Num, vec![ValType::Num];
 			], {
-				Val::Num(n.ln())
-			}),
+				Ok(Val::Num(n.ln()))
+			})?,
 			("std", "trace") => parse_args!(context, "std.trace", args, 2, [
 				0, str: [Val::Str]!!Val::Str, vec![ValType::Str];
 				1, rest, vec![];
@@ -526,21 +524,21 @@
 					});
 				}
 				eprintln!(" {}", str);
-				rest
-			}),
+				Ok(rest)
+			})?,
 			("std", "pow") => parse_args!(context, "std.modulo", args, 2, [
 				0, x: [Val::Num]!!Val::Num, vec![ValType::Num];
 				1, n: [Val::Num]!!Val::Num, vec![ValType::Num];
 			], {
-				Val::Num(x.powf(n))
-			}),
+				Ok(Val::Num(x.powf(n)))
+			})?,
 			("std", "extVar") => parse_args!(context, "std.extVar", args, 2, [
 				0, x: [Val::Str]!!Val::Str, vec![ValType::Str];
 			], {
-				with_state(|s| s.settings().ext_vars.get(&x).cloned()).ok_or_else(
-					|| create_error(crate::Error::UndefinedExternalVariable(x)),
-				)?
-			}),
+				Ok(with_state(|s| s.settings().ext_vars.get(&x).cloned()).ok_or_else(
+					|| UndefinedExternalVariable(x),
+				)?)
+			})?,
 			("std", "filter") => noinline!(parse_args!(context, "std.filter", args, 2, [
 				0, func: [Val::Func]!!Val::Func, vec![ValType::Func];
 				1, arr: [Val::Arr]!!Val::Arr, vec![ValType::Arr];
@@ -583,6 +581,7 @@
 				Ok(acc)
 			}))?,
 			// faster
+			#[allow(non_snake_case)]
 			("std", "sortImpl") => noinline!(parse_args!(context, "std.sort", args, 2, [
 				0, arr: [Val::Arr]!!Val::Arr, vec![ValType::Arr];
 				1, keyF: [Val::Func]!!Val::Func, vec![ValType::Func];
@@ -598,7 +597,7 @@
 							match keyF.evaluate_values(context.clone(), &[k.clone()]) {
 								Ok(Val::Str(v)) => v,
 								Ok(_) => {
-									err = Some(create_error(crate::error::Error::RuntimeError("types of all array elements should equal".into())));
+									err = Some(LocError::new(RuntimeError("types of all array elements should equal".into())));
 									"".into()
 								}
 								Err(e) => {
@@ -617,7 +616,7 @@
 							match (keyF.evaluate_values(context.clone(), &[a.clone()]), keyF.evaluate_values(context.clone(), &[b.clone()])) {
 								(Ok(Val::Num(a)), Ok(Val::Num(b))) => a.partial_cmp(&b).unwrap(),
 								(Ok(_a), Ok(_b)) => {
-									err = Some(create_error(crate::error::Error::RuntimeError("types of all array elements should equal".into())));
+									err = Some(RuntimeError("types of all array elements should equal".into()).into());
 									Ordering::Equal
 								}
 								(Err(e), _) | (_, Err(e)) => {
@@ -630,21 +629,23 @@
 							return Err(e);
 						}
 					},
-					_ => return Err(create_error(crate::error::Error::RuntimeError("keys should be number or string".into())))
+					_ => throw!(RuntimeError("keys should be number or string".into()))
 				}
 				Ok(Val::Arr(Rc::new(new_arr)))
 			}))?,
 			// faster
 			("std", "format") => parse_args!(context, "std.format", args, 2, [
 				0, str: [Val::Str]!!Val::Str, vec![ValType::Str];
-				1, vals: [Val::Arr|Val::Obj], vec![ValType::Arr, ValType::Obj];
+				1, vals, vec![]
 			], {
-				match vals {
-					Val::Arr(vals) => Val::Str(format_arr(&str, &vals).unwrap().into()),
-					Val::Obj(obj) => Val::Str(format_obj(&str, &obj).unwrap().into()),
-					_ => unreachable!()
-				}
-			}),
+				push(&Some(ExprLocation(Rc::from(PathBuf::from("std.jsonnet")), 0, 0)), ||format!("std.format of {}", str), ||{
+					Ok(match vals {
+						Val::Arr(vals) => Val::Str(format_arr(&str, &vals)?.into()),
+						Val::Obj(obj) => Val::Str(format_obj(&str, &obj)?.into()),
+						o => Val::Str(format_arr(&str, &[o])?.into()),
+					})
+				})
+			})?,
 			// faster
 			("std", "range") => parse_args!(context, "std.range", args, 2, [
 				0, from: [Val::Num]!!Val::Num, vec![ValType::Num];
@@ -654,22 +655,22 @@
 				for i in from as usize..=to as usize {
 					out.push(Val::Num(i as f64));
 				}
-				Val::Arr(Rc::new(out))
-			}),
+				Ok(Val::Arr(Rc::new(out)))
+			})?,
 			("std", "char") => parse_args!(context, "std.char", args, 1, [
 				0, n: [Val::Num]!!Val::Num, vec![ValType::Num];
 			], {
 				let mut out = String::new();
 				out.push(std::char::from_u32(n as u32).ok_or_else(||
-					create_error(crate::error::Error::InvalidUnicodeCodepointGot(n as u32))
+					InvalidUnicodeCodepointGot(n as u32)
 				)?);
 				Ok(Val::Str(out.into()))
 			})?,
 			("std", "encodeUTF8") => parse_args!(context, "std.encodeUtf8", args, 1, [
 				0, str: [Val::Str]!!Val::Str, vec![ValType::Str];
 			], {
-				Val::Arr(Rc::new(str.bytes().map(|b| Val::Num(b as f64)).collect()))
-			}),
+				Ok(Val::Arr(Rc::new(str.bytes().map(|b| Val::Num(b as f64)).collect())))
+			})?,
 			("std", "md5") => noinline!(parse_args!(context, "std.md5", args, 1, [
 				0, str: [Val::Str]!!Val::Str, vec![ValType::Str];
 			], {
@@ -679,7 +680,7 @@
 			("std", "base64") => parse_args!(context, "std.base64", args, 1, [
 				0, input: [Val::Str | Val::Arr], vec![ValType::Arr, ValType::Str];
 			], {
-				Val::Str(match input {
+				Ok(Val::Str(match input {
 					Val::Str(s) => {
 						base64::encode(s.bytes().collect::<Vec<_>>()).into()
 					},
@@ -689,8 +690,8 @@
 						}).collect::<Result<Vec<_>>>()?).into()
 					},
 					_ => unreachable!()
-				})
-			}),
+				}))
+			})?,
 			// faster
 			("std", "join") => noinline!(parse_args!(context, "std.join", args, 2, [
 				0, sep: [Val::Str|Val::Arr], vec![ValType::Str, ValType::Arr];
@@ -711,7 +712,7 @@
 								out.reserve(items.len());
 								out.extend(items.iter().cloned());
 							} else {
-								create_error_result(crate::Error::RuntimeError("in std.join all items should be arrays".into()))?;
+								throw!(RuntimeError("in std.join all items should be arrays".into()));
 							}
 						}
 
@@ -729,7 +730,7 @@
 								first = false;
 								out += &item;
 							} else {
-								create_error_result(crate::Error::RuntimeError("in std.join all items should be strings".into()))?;
+								throw!(RuntimeError("in std.join all items should be strings".into()));
 							}
 						}
 
@@ -742,18 +743,16 @@
 			("std", "escapeStringJson") => parse_args!(context, "std.escapeStringJson", args, 1, [
 				0, str_: [Val::Str]!!Val::Str, vec![ValType::Str];
 			], {
-				Val::Str(escape_string_json(&str_).into())
-			}),
+				Ok(Val::Str(escape_string_json(&str_).into()))
+			})?,
 			// Faster
 			("std", "manifestJsonEx") => parse_args!(context, "std.manifestJsonEx", args, 2, [
 				0, value, vec![];
 				1, indent: [Val::Str]!!Val::Str, vec![ValType::Str];
 			], {
-				Val::Str(manifest_json_ex(&value, &indent)?.into())
-			}),
-			(ns, name) => {
-				create_error_result(crate::Error::IntristicNotFound(ns.into(), name.into()))?
-			}
+				Ok(Val::Str(manifest_json_ex(&value, &indent)?.into()))
+			})?,
+			(ns, name) => throw!(IntristicNotFound(ns.into(), name.into())),
 		},
 		Val::Func(f) => {
 			let body = || f.evaluate(context, args, tailstrict);
@@ -763,7 +762,7 @@
 				push(loc, || format!("function <{}> call", f.name), body)?
 			}
 		}
-		v => create_error_result(crate::Error::OnlyFunctionsCanBeCalledGot(v.value_type()?))?,
+		v => throw!(OnlyFunctionsCanBeCalledGot(v.value_type()?)),
 	})
 }
 
@@ -784,13 +783,13 @@
 			context
 				.this()
 				.clone()
-				.ok_or_else(|| create_error(crate::Error::CantUseSelfOutsideOfObject))?,
+				.ok_or_else(|| CantUseSelfOutsideOfObject)?,
 		),
 		Literal(LiteralType::Dollar) => Val::Obj(
 			context
 				.dollar()
 				.clone()
-				.ok_or_else(|| create_error(crate::Error::NoTopLevelObjectFound))?,
+				.ok_or_else(|| NoTopLevelObjectFound)?,
 		),
 		Literal(LiteralType::True) => Val::Bool(true),
 		Literal(LiteralType::False) => Val::Bool(false),
@@ -825,34 +824,30 @@
 					} else if let Some(Val::Str(n)) = v.get("__intristic_namespace__".into())? {
 						Val::Intristic(n, s)
 					} else {
-						create_error_result(crate::Error::NoSuchField(s))?
+						throw!(NoSuchField(s))
 					}
 				}
-				(Val::Obj(_), n) => create_error_result(crate::Error::ValueIndexMustBeTypeGot(
+				(Val::Obj(_), n) => throw!(ValueIndexMustBeTypeGot(
 					ValType::Obj,
 					ValType::Str,
 					n.value_type()?,
-				))?,
+				)),
 
 				(Val::Arr(v), Val::Num(n)) => {
 					if n.fract() > f64::EPSILON {
-						create_error_result(crate::Error::FractionalIndex)?
+						throw!(FractionalIndex)
 					}
 					v.get(n as usize)
-						.ok_or_else(|| {
-							create_error(crate::Error::ArrayBoundsError(n as usize, v.len()))
-						})?
+						.ok_or_else(|| ArrayBoundsError(n as usize, v.len()))?
 						.clone()
 						.unwrap_if_lazy()?
-				}
-				(Val::Arr(_), Val::Str(n)) => {
-					create_error_result(crate::Error::AttemptedIndexAnArrayWithString(n))?
 				}
-				(Val::Arr(_), n) => create_error_result(crate::Error::ValueIndexMustBeTypeGot(
+				(Val::Arr(_), Val::Str(n)) => throw!(AttemptedIndexAnArrayWithString(n)),
+				(Val::Arr(_), n) => throw!(ValueIndexMustBeTypeGot(
 					ValType::Arr,
 					ValType::Num,
 					n.value_type()?,
-				))?,
+				)),
 
 				(Val::Str(s), Val::Num(n)) => Val::Str(
 					s.chars()
@@ -861,13 +856,13 @@
 						.collect::<String>()
 						.into(),
 				),
-				(Val::Str(_), n) => create_error_result(crate::Error::ValueIndexMustBeTypeGot(
+				(Val::Str(_), n) => throw!(ValueIndexMustBeTypeGot(
 					ValType::Str,
 					ValType::Num,
 					n.value_type()?,
-				))?,
+				)),
 
-				(v, _) => create_error_result(crate::Error::CantIndexInto(v.value_type()?))?,
+				(v, _) => throw!(CantIndexInto(v.value_type()?)),
 			}
 		}
 		LocalExpr(bindings, returned) => {
@@ -926,18 +921,18 @@
 			if assertion_result {
 				evaluate(context, returned)?
 			} else if let Some(msg) = msg {
-				create_error_result(crate::Error::AssertionFailed(evaluate(context, msg)?))?
+				throw!(AssertionFailed(evaluate(context, msg)?));
 			} else {
-				create_error_result(crate::Error::AssertionFailed(Val::Null))?
+				throw!(AssertionFailed(Val::Null));
 			}
 		}
-		Error(e) => push(
+		ErrorStmt(e) => push(
 			&loc,
 			|| "error statement".to_owned(),
 			|| {
-				create_error_result(crate::Error::RuntimeError(
+				throw!(RuntimeError(
 					evaluate(context, e)?.try_cast_str("error text should be string")?,
-				))?
+				))
 			},
 		)?,
 		IfElse {
@@ -978,6 +973,6 @@
 			import_location.pop();
 			Val::Str(with_state(|s| s.import_file_str(&import_location, path))?)
 		}
-		Literal(LiteralType::Super) => return create_error_result(crate::Error::StandaloneSuper),
+		Literal(LiteralType::Super) => throw!(StandaloneSuper),
 	})
 }
modifiedcrates/jrsonnet-evaluator/src/function.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/function.rs
+++ b/crates/jrsonnet-evaluator/src/function.rs
@@ -1,7 +1,4 @@
-use crate::{
-	create_error, create_error_result, evaluate, lazy_val, resolved_lazy_val, Context, Error,
-	Result, Val,
-};
+use crate::{error::Error::*, evaluate, lazy_val, resolved_lazy_val, throw, Context, Result, Val};
 use closure::closure;
 use jrsonnet_parser::{ArgsDesc, ParamsDesc};
 use std::{collections::HashMap, rc::Rc};
@@ -30,16 +27,16 @@
 			params
 				.iter()
 				.position(|p| *p.0 == *name)
-				.ok_or_else(|| create_error(Error::UnknownFunctionParameter(name.clone())))?
+				.ok_or_else(|| UnknownFunctionParameter(name.clone()))?
 		} else {
 			id
 		};
 
 		if idx >= params.len() {
-			create_error_result(Error::TooManyArgsFunctionHas(params.len()))?;
+			throw!(TooManyArgsFunctionHas(params.len()));
 		}
 		if positioned_args[idx].is_some() {
-			create_error_result(Error::BindingParameterASecondTime(params[idx].0.clone()))?;
+			throw!(BindingParameterASecondTime(params[idx].0.clone()));
 		}
 		positioned_args[idx] = Some(arg.1.clone());
 	}
@@ -50,8 +47,7 @@
 		} else if let Some(default) = &p.1 {
 			(body_ctx.clone().expect(NO_DEFAULT_CONTEXT), default)
 		} else {
-			create_error_result(Error::FunctionParameterNotBoundInCall(p.0.clone()))?;
-			unreachable!()
+			throw!(FunctionParameterNotBoundInCall(p.0.clone()));
 		};
 		let val = if tailstrict {
 			resolved_lazy_val!(evaluate(ctx, expr)?)
@@ -74,15 +70,16 @@
 	let mut out = HashMap::new();
 	let mut positioned_args = vec![None; params.0.len()];
 	for (name, val) in args.iter() {
-		let idx = params.iter().position(|p| *p.0 == **name).ok_or_else(|| {
-			create_error(Error::UnknownFunctionParameter((&name as &str).to_owned()))
-		})?;
+		let idx = params
+			.iter()
+			.position(|p| *p.0 == **name)
+			.ok_or_else(|| UnknownFunctionParameter((&name as &str).to_owned()))?;
 
 		if idx >= params.len() {
-			create_error_result(Error::TooManyArgsFunctionHas(params.len()))?;
+			throw!(TooManyArgsFunctionHas(params.len()));
 		}
 		if positioned_args[idx].is_some() {
-			create_error_result(Error::BindingParameterASecondTime(params[idx].0.clone()))?;
+			throw!(BindingParameterASecondTime(params[idx].0.clone()));
 		}
 		positioned_args[idx] = Some(val.clone());
 	}
@@ -104,8 +101,7 @@
 				})
 			}
 		} else {
-			create_error_result(Error::FunctionParameterNotBoundInCall(p.0.clone()))?;
-			unreachable!()
+			throw!(FunctionParameterNotBoundInCall(p.0.clone()));
 		};
 		out.insert(p.0.clone(), val);
 	}
@@ -123,7 +119,7 @@
 	let mut positioned_args = vec![None; params.0.len()];
 	for (id, arg) in args.iter().enumerate() {
 		if id >= params.len() {
-			create_error_result(Error::TooManyArgsFunctionHas(params.len()))?;
+			throw!(TooManyArgsFunctionHas(params.len()));
 		}
 		positioned_args[id] = Some(arg);
 	}
@@ -134,8 +130,7 @@
 		} else if let Some(default) = &p.1 {
 			evaluate(ctx.clone(), default)?
 		} else {
-			create_error_result(Error::FunctionParameterNotBoundInCall(p.0.clone()))?;
-			unreachable!()
+			throw!(FunctionParameterNotBoundInCall(p.0.clone()));
 		};
 		out.insert(p.0.clone(), resolved_lazy_val!(val));
 	}
@@ -148,36 +143,39 @@
 	($ctx: expr, $fn_name: expr, $args: expr, $total_args: expr, [
 		$($id: expr, $name: ident $(: [$($p: path)|+] $(!! $a: path)?)?, $nt: expr);+ $(;)?
 	], $handler:block) => {{
-		use crate::Error;
+		use crate::{throw, error::Error::*};
 		let args = $args;
 		if args.len() > $total_args {
-			create_error_result(Error::TooManyArgsFunctionHas($total_args))?;
+			throw!(TooManyArgsFunctionHas($total_args));
 		}
 		$(
 			if args.len() <= $id {
-				create_error_result(Error::FunctionParameterNotBoundInCall(stringify!($name).into()))?;
+				throw!(FunctionParameterNotBoundInCall(stringify!($name).into()));
 			}
 			let $name = &args[$id];
 			if $name.0.is_some() {
 				if $name.0.as_ref().unwrap() != stringify!($name) {
-					create_error_result(Error::IntristicArgumentReorderingIsNotSupportedYet)?;
+					throw!(IntristicArgumentReorderingIsNotSupportedYet);
 				}
 			}
 			let $name = evaluate($ctx.clone(), &$name.1)?;
 			$(
 				match $name {
 					$($p(_))|+ => {},
-					_ => create_error_result(Error::TypeMismatch(concat!($fn_name, " ", stringify!($id), "nd (", stringify!($name), ") argument"), $nt, $name.value_type()?))?,
+					_ => throw!(TypeMismatch(
+						concat!($fn_name, " ", stringify!($id), "nd (", stringify!($name), ") argument"),
+						$nt, $name.value_type()?
+					)),
 				};
 				$(
 					let $name = match $name {
 						$a(v) => v,
-						_ => create_error_result(Error::TypeMismatch(concat!($fn_name, " ", stringify!($id), "nd (", stringify!($name), ") argument"), $nt, $name.value_type()?))?,
+						_ =>throw!(TypeMismatch(concat!($fn_name, " ", stringify!($id), "nd (", stringify!($name), ") argument"), $nt, $name.value_type()?)),
 					};
 				)*
 			)*
 		)+
-		$handler
+		($handler as crate::Result<_>)
 	}};
 }
 
@@ -198,7 +196,9 @@
 		], {
 			assert!((a - 2.0).abs() <= f64::EPSILON);
 			assert!((b - 1.0).abs() <= f64::EPSILON);
-		});
+			Ok(())
+		})
+		.unwrap();
 		Ok(())
 	})
 }
modifiedcrates/jrsonnet-evaluator/src/import.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/import.rs
+++ b/crates/jrsonnet-evaluator/src/import.rs
@@ -1,7 +1,6 @@
-use crate::create_error_result;
 use crate::{
-	create_error,
-	error::{Error, Result},
+	error::{Error::*, Result},
+	throw,
 };
 use fs::File;
 use std::fs;
@@ -28,7 +27,7 @@
 pub struct DummyImportResolver;
 impl ImportResolver for DummyImportResolver {
 	fn resolve_file(&self, from: &PathBuf, path: &PathBuf) -> Result<Rc<PathBuf>> {
-		create_error_result(Error::ImportNotSupported(from.clone(), path.clone()))
+		throw!(ImportNotSupported(from.clone(), path.clone()))
 	}
 	fn load_file_contents(&self, _resolved: &PathBuf) -> Result<Rc<str>> {
 		// Can be only caused by library direct consumer, not by supplied jsonnet
@@ -65,15 +64,14 @@
 					return Ok(Rc::new(cloned));
 				}
 			}
-			create_error_result(Error::ImportFileNotFound(from.clone(), path.clone()))
+			throw!(ImportFileNotFound(from.clone(), path.clone()))
 		}
 	}
 	fn load_file_contents(&self, id: &PathBuf) -> Result<Rc<str>> {
-		let mut file =
-			File::open(id).map_err(|_e| create_error(Error::ResolvedFileNotFound(id.clone())))?;
+		let mut file = File::open(id).map_err(|_e| ResolvedFileNotFound(id.clone()))?;
 		let mut out = String::new();
 		file.read_to_string(&mut out)
-			.map_err(|_e| create_error(Error::ImportBadFileUtf8(id.clone())))?;
+			.map_err(|_e| ImportBadFileUtf8(id.clone()))?;
 		Ok(out.into())
 	}
 	unsafe fn as_any(&self) -> &dyn Any {
modifiedcrates/jrsonnet-evaluator/src/lib.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/lib.rs
+++ b/crates/jrsonnet-evaluator/src/lib.rs
@@ -10,7 +10,7 @@
 mod builtin;
 mod ctx;
 mod dynamic;
-mod error;
+pub mod error;
 mod evaluate;
 mod function;
 mod import;
@@ -21,7 +21,7 @@
 
 pub use ctx::*;
 pub use dynamic::*;
-pub use error::*;
+use error::{Error::*, LocError, Result, StackTraceElement};
 pub use evaluate::*;
 pub use function::parse_function_call;
 pub use import::*;
@@ -131,13 +131,7 @@
 }
 pub(crate) fn with_state<T>(f: impl FnOnce(&EvaluationState) -> T) -> T {
 	EVAL_STATE.with(|s| f(s.borrow().as_ref().unwrap()))
-}
-pub fn create_error(err: Error) -> LocError {
-	LocError(err, StackTrace(vec![]))
 }
-pub fn create_error_result<T>(err: Error) -> Result<T> {
-	Err(LocError(err, StackTrace(vec![])))
-}
 pub(crate) fn push<T>(
 	e: &Option<ExprLocation>,
 	frame_desc: impl FnOnce() -> String,
@@ -167,12 +161,10 @@
 					loc_data: true,
 				},
 			)
-			.map_err(|error| {
-				create_error(Error::ImportSyntaxError {
-					error,
-					path,
-					source_code,
-				})
+			.map_err(|error| ImportSyntaxError {
+				error,
+				path,
+				source_code,
 			})?,
 		)?;
 
@@ -292,7 +284,7 @@
 			if *stack_depth > self.max_stack() {
 				// Error creation uses data, so i drop guard here
 				drop(data);
-				return Err(create_error(Error::StackOverflow));
+				throw!(StackOverflow);
 			} else {
 				*stack_depth += 1;
 			}
@@ -340,7 +332,7 @@
 				ManifestFormat::Json(padding) => val.into_json(padding)?,
 				ManifestFormat::None => match val {
 					Val::Str(s) => s,
-					_ => return Err(create_error(Error::StringManifestOutputIsNotAString)),
+					_ => throw!(StringManifestOutputIsNotAString),
 				},
 			})
 		})
@@ -476,7 +468,7 @@
 #[cfg(test)]
 pub mod tests {
 	use super::Val;
-	use crate::{create_error, primitive_equals, EvaluationState};
+	use crate::{error::Error::*, primitive_equals, EvaluationState};
 	use jrsonnet_parser::*;
 	use std::{path::PathBuf, rc::Rc};
 
@@ -493,7 +485,7 @@
 						state.push(
 							&ExprLocation(Rc::new(PathBuf::from("test2.jsonnet")), 30, 40),
 							|| "inner".to_owned(),
-							|| Err(create_error(crate::error::Error::RuntimeError("".into()))),
+							|| Err(RuntimeError("".into()).into()),
 						)?;
 						Ok(())
 					},
modifiedcrates/jrsonnet-evaluator/src/obj.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/obj.rs
+++ b/crates/jrsonnet-evaluator/src/obj.rs
@@ -11,11 +11,13 @@
 	pub location: Option<ExprLocation>,
 }
 
+// Field => This
+type CacheKey = (Rc<str>, usize);
 #[derive(Debug)]
 pub struct ObjValueInternals {
 	super_obj: Option<ObjValue>,
 	this_entries: Rc<HashMap<Rc<str>, ObjMember>>,
-	value_cache: RefCell<HashMap<(Rc<str>, usize), Option<Val>>>,
+	value_cache: RefCell<HashMap<CacheKey, Option<Val>>>,
 }
 #[derive(Clone)]
 pub struct ObjValue(pub(crate) Rc<ObjValueInternals>);
modifiedcrates/jrsonnet-evaluator/src/val.rsdiffbeforeafterboth
--- a/crates/jrsonnet-evaluator/src/val.rs
+++ b/crates/jrsonnet-evaluator/src/val.rs
@@ -1,7 +1,8 @@
 use crate::{
-	create_error_result, evaluate,
+	error::Error::*,
+	evaluate,
 	function::{parse_function_call, parse_function_call_map, place_args},
-	with_state, Context, Error, ObjValue, Result,
+	throw, with_state, Context, ObjValue, Result,
 };
 use jrsonnet_parser::{el, Arg, ArgsDesc, Expr, LocExpr, ParamsDesc};
 use std::{
@@ -157,14 +158,14 @@
 		if num.is_finite() {
 			Ok(Val::Num(num))
 		} else {
-			create_error_result(Error::RuntimeError("overflow".into()))
+			throw!(RuntimeError("overflow".into()))
 		}
 	}
 
 	pub fn assert_type(&self, context: &'static str, val_type: ValType) -> Result<()> {
 		let this_type = self.value_type()?;
 		if this_type != val_type {
-			create_error_result(Error::TypeMismatch(context, vec![val_type], this_type))
+			throw!(TypeMismatch(context, vec![val_type], this_type))
 		} else {
 			Ok(())
 		}
@@ -263,15 +264,15 @@
 		(Val::Null, Val::Null) => true,
 		(Val::Str(a), Val::Str(b)) => a == b,
 		(Val::Num(a), Val::Num(b)) => (a - b).abs() <= f64::EPSILON,
-		(Val::Arr(_), Val::Arr(_)) => create_error_result(Error::RuntimeError(
+		(Val::Arr(_), Val::Arr(_)) => throw!(RuntimeError(
 			"primitiveEquals operates on primitive types, got array".into(),
-		))?,
-		(Val::Obj(_), Val::Obj(_)) => create_error_result(Error::RuntimeError(
+		)),
+		(Val::Obj(_), Val::Obj(_)) => throw!(RuntimeError(
 			"primitiveEquals operates on primitive types, got object".into(),
-		))?,
-		(a, b) if is_function_like(&a) && is_function_like(&b) => create_error_result(
-			Error::RuntimeError("cannot test equality of functions".into()),
-		)?,
+		)),
+		(a, b) if is_function_like(&a) && is_function_like(&b) => {
+			throw!(RuntimeError("cannot test equality of functions".into()))
+		}
 		(_, _) => false,
 	})
 }
@@ -376,7 +377,7 @@
 			buf.push('}');
 		}
 		Val::Func(_) | Val::Intristic(_, _) => {
-			create_error_result(Error::RuntimeError("tried to manifest function".into()))?
+			throw!(RuntimeError("tried to manifest function".into()))
 		}
 		Val::Lazy(_) => unreachable!(),
 	};
modifiedcrates/jrsonnet-parser/src/expr.rsdiffbeforeafterboth
--- a/crates/jrsonnet-parser/src/expr.rs
+++ b/crates/jrsonnet-parser/src/expr.rs
@@ -258,7 +258,7 @@
 	/// importStr "file.txt"
 	ImportStr(PathBuf),
 	/// error "I'm broken"
-	Error(LocExpr),
+	ErrorStmt(LocExpr),
 	/// a(b, c)
 	Apply(LocExpr, ArgsDesc, bool),
 	/// a[b]
modifiedcrates/jrsonnet-parser/src/lib.rsdiffbeforeafterboth
--- a/crates/jrsonnet-parser/src/lib.rs
+++ b/crates/jrsonnet-parser/src/lib.rs
@@ -197,7 +197,7 @@
 			/ l(s,<keyword("function") _ "(" _ params:params(s) _ ")" _ expr:expr(s) {Expr::Function(params, expr)}>)
 			/ l(s,<assertion:assertion(s) _ ";" _ expr:expr(s) { Expr::AssertExpr(assertion, expr) }>)
 
-			/ l(s,<keyword("error") _ expr:expr(s) { Expr::Error(expr) }>)
+			/ l(s,<keyword("error") _ expr:expr(s) { Expr::ErrorStmt(expr) }>)
 
 		rule slice_part(s: &ParserSettings) -> Option<LocExpr>
 			= e:(_ e:expr(s) _{e})? {e}