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Preserve native item remainder conversion and shared stack identity

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Ludovic Marie
2026-10-07 08:53:10 +02:00
parent 0a582b56d6
commit e6d39183b5
7 changed files with 711 additions and 0 deletions
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benchmarks/rust-use-remainder-2026-10-07/scoped-parity.json
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{
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"platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
"java": "openjdk 25.0.4.1 2026-08-18",
"rustc": "rustc 1.99.0 (b940084d7 2026-09-28)",
"fixtures": 5216,
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},
"fixtures_sha256": {
".local/rust-use-remainder-parity/inputs.txt": "f3be368b63f3d035783da8cfc6a22a9ff02188da5ac68f109460d2188477f095"
},
"rust_output_sha256": "8639a449feb82e464bc3f42dad86bf372263976ad5e133bf009ce624700fc2d4",
"references": [
{
"side": "client",
"jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
"output_sha256": "8639a449feb82e464bc3f42dad86bf372263976ad5e133bf009ce624700fc2d4",
"matched_output_lines": 353264
},
{
"side": "server",
"jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
"output_sha256": "8639a449feb82e464bc3f42dad86bf372263976ad5e133bf009ce624700fc2d4",
"matched_output_lines": 353264
}
],
"scope": "Actual UseRemainder.convertIntoRemainder composed with native ItemStackTemplate creation/validation and shared ItemStack references. Covers finite/infinite materials, visible count comparisons, exhausted and empty-but-distinct inputs, invalid templates returning canonical EMPTY, extra-item callbacks with mutations/failures, and captured-reference identity. Rust uses its item-template factory with scalar validation; contained component validation, concrete actor inventory insertion/drop, item finish side effects and complete gameplay integration remain pending."
}
crates/horizon-world/examples/use_remainder_fixture.rs
+277
View File
@@ -0,0 +1,277 @@
use horizon_world::{
component_patch::{Patch, Prototype},
item_stack_refs::{ItemStacks, StackRef},
item_stack_storage::ItemStackData,
item_template::{self, ItemTemplate, ValidationRules},
};
use serde_json::Value;
use std::{
fs,
io::{self, Write},
path::Path,
};
type Stack = StackRef<u8, usize, i32>;
type Template = ItemTemplate<u8, usize, i32>;
struct Rules;
impl ValidationRules<u8, usize, i32> for Rules {
type ContentsError = std::convert::Infallible;
fn has_max_damage(&self, s: &ItemStackData<u8, usize, i32>) -> bool {
s.component(&1).is_some()
}
fn max_stack_size(&self, s: &ItemStackData<u8, usize, i32>) -> i32 {
s.component(&0).copied().unwrap_or(1)
}
fn validate_contents(
&self,
_: &ItemStackData<u8, usize, i32>,
) -> Result<(), Self::ContentsError> {
Ok(())
}
}
fn opt(v: Option<i32>) -> String {
v.map_or("none".into(), |v| v.to_string())
}
fn patch(v: &Value) -> Patch<usize, i32> {
Patch::new(v.as_array().unwrap().iter().map(|v| {
(
v[0].as_u64().unwrap() as usize,
v[1].as_i64().map(|n| n as i32),
)
}))
}
fn proto(v: &Value) -> Prototype<usize, i32> {
Prototype::new(v.as_array().unwrap().iter().map(|v| {
(
v[0].as_u64().unwrap() as usize,
v[1].as_i64().unwrap() as i32,
)
}))
}
fn patch_text(p: &Patch<usize, i32>) -> String {
p.entries()
.iter()
.map(|(k, v)| format!("{k}={}", opt(*v)))
.collect::<Vec<_>>()
.join(",")
}
fn all(
out: &mut dyn Write,
stacks: &[Stack],
templates: &[Option<Template>],
prototypes: &[Prototype<usize, i32>],
store: &ItemStacks<u8, usize, i32>,
) -> io::Result<()> {
for (i, s) in stacks.iter().enumerate() {
let data = s.read();
let values = (0..3)
.map(|k| opt(data.component(&k).copied()))
.collect::<Vec<_>>()
.join(",");
writeln!(
out,
"stack {i} {} {} {} {} {} {} {} | {} | {}",
s.same_reference(&store.empty()),
data.item(),
data.count,
data.count(),
data.pop_time,
data.is_empty(),
item_template::validate_strict(&data, &Rules).is_ok(),
values,
patch_text(&data.components.as_patch())
)?;
}
for (i, t) in templates.iter().enumerate() {
if let Some(t) = t {
let values = (0..3)
.map(|k| opt(t.component(&prototypes[t.item() as usize], &k).copied()))
.collect::<Vec<_>>()
.join(",");
writeln!(
out,
"template {i} {} {} | {} | {}",
t.item(),
t.count(),
values,
patch_text(t.patch())
)?;
} else {
writeln!(out, "template {i} none")?;
}
}
for a in 0..3 {
for b in a + 1..3 {
let same = match (&templates[a], &templates[b]) {
(None, None) => true,
(Some(a), Some(b)) => a.same_reference(b),
_ => false,
};
writeln!(
out,
"same {a} {b} {} {same}",
stacks[a].same_reference(&stacks[b])
)?;
}
}
Ok(())
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let arg = std::env::args().nth(1).unwrap();
let dir = Path::new(&arg);
let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
let f: Value = serde_json::from_str(line)?;
let store = ItemStacks::new(0);
let mut prototypes: Vec<_> = f["prototypes"]
.as_array()
.unwrap()
.iter()
.map(proto)
.collect();
let mut stacks: Vec<_> = f["stacks"]
.as_array()
.unwrap()
.iter()
.map(|v| {
let id = v["item"].as_i64().unwrap();
if id < 0 {
store.empty()
} else {
let s = store.create(
id as u8,
v["count"].as_i64().unwrap() as i32,
prototypes[id as usize].clone(),
);
s.write().pop_time = 5;
s.write().components.restore_patch(&patch(&v["patch"]));
s
}
})
.collect();
let mut templates: Vec<Option<Template>> = vec![None, None, None];
all(&mut out, &stacks, &templates, &prototypes, &store)?;
for op in f["ops"].as_array().unwrap() {
let a = op["a"].as_u64().unwrap() as usize;
let b = op["b"].as_u64().unwrap() as usize;
let n = op["count"].as_i64().unwrap() as i32;
let result: Result<(), ()> = (|| {
match op["kind"].as_str().unwrap() {
"convert" => {
let t = templates[op["template"].as_u64().unwrap() as usize]
.as_ref()
.ok_or(())?;
let captured = stacks[a].clone();
stacks[b] = horizon_world::use_remainder::convert(
captured,
n,
op["infinite"].as_bool().unwrap(),
|| {
t.create(&store, prototypes[t.item() as usize].clone(), &Rules)
.0
},
|extra| {
writeln!(
out,
"extra {} {} {}",
extra.same_reference(&store.empty()),
extra.read().item(),
extra.read().count()
)
.unwrap();
if op["fail"] == 1 {
return Err(());
}
extra.write().count = op["extra_count"].as_i64().unwrap() as i32;
stacks[a].write().count =
op["source_count"].as_i64().unwrap() as i32;
let replace = op["replace"].as_i64().unwrap();
if replace >= 0 {
stacks[a] = stacks[replace as usize].clone();
}
stacks[2] = extra;
if op["fail"] == 2 {
return Err(());
}
Ok(())
},
)?;
}
"new" => {
templates[b] = Some(
Template::new(
op["item"].as_u64().unwrap() as u8,
0,
n,
patch(&op["patch"]),
)
.map_err(|_| ())?,
)
}
"from" => {
templates[b] =
Some(Template::from_stack(&stacks[a].read(), 0).map_err(|_| ())?)
}
"from-nonempty" => {
templates[b] = Some(
Template::from_non_empty_stack(&stacks[a].read(), 0).map_err(|_| ())?,
)
}
"from-count" => {
templates[b] = Some(
Template::from_non_empty_stack_with_count(&stacks[a].read(), 0, n)
.map_err(|_| ())?,
)
}
"with" => {
templates[b] = Some(
templates[a]
.as_ref()
.ok_or(())?
.with_count(n)
.map_err(|_| ())?,
)
}
"create" => {
let t = templates[a].as_ref().ok_or(())?;
stacks[b] = t
.create(&store, prototypes[t.item() as usize].clone(), &Rules)
.0;
}
"apply" | "apply-count" => {
let t = templates[a].as_ref().ok_or(())?;
let count = if op["kind"] == "apply" { t.count() } else { n };
stacks[b] = t
.apply(
&store,
prototypes[t.item() as usize].clone(),
count,
&patch(&op["patch"]),
&Rules,
)
.0;
}
"validate-patch" => {
let _ = item_template::apply_validated(
&mut stacks[a].write(),
&patch(&op["patch"]),
&Rules,
);
}
"count" => stacks[a].write().count = n,
"prototype" => {
prototypes[op["item"].as_u64().unwrap() as usize] = proto(&op["prototype"])
}
_ => panic!(),
}
Ok(())
})();
writeln!(
out,
"result {}",
if result.is_ok() { "ok" } else { "error" }
)?;
all(&mut out, &stacks, &templates, &prototypes, &store)?;
}
}
Ok(())
}
crates/horizon-world/src/lib.rs
+1
View File
@@ -87,6 +87,7 @@ pub mod suffocation;
pub mod swimming;
pub mod synced_floats;
pub mod tick_data;
pub mod use_remainder;
pub mod view_direction;
pub mod water_splash;
pub mod world_movement;
crates/horizon-world/src/use_remainder.rs
+21
View File
@@ -0,0 +1,21 @@
//! Use-remainder conversion preserves stack identity and only creates a
//! remainder after an actual count decrease for a finite-material actor.
use crate::item_stack_refs::StackRef;
pub fn convert<I: Copy + Eq, K: Clone + Eq, V: Clone + PartialEq, E>(
stack: StackRef<I, K, V>,
original_count: i32,
infinite_materials: bool,
create: impl FnOnce() -> StackRef<I, K, V>,
extra: impl FnOnce(StackRef<I, K, V>) -> Result<(), E>,
) -> Result<StackRef<I, K, V>, E> {
if infinite_materials || stack.read().count() >= original_count {
return Ok(stack);
}
let remainder = create();
if stack.read().is_empty() {
return Ok(remainder);
}
extra(remainder)?;
Ok(stack)
}
docs/collision-geometry.md
+16
View File
@@ -1832,3 +1832,19 @@ counts, changed prototypes, component removals, aliasing and validation rollback
Targeted Clippy passes. Contained components and bundle-weight validation are
not exercised by this corpus; their schema implementation, codecs, use-remainder
integration and complete gameplay integration remain pending.
`use_remainder` converts a consumed stack using the validated item-template
factory. Infinite materials and unchanged visible counts retain the original
reference. An exhausted stack returns the created remainder; otherwise an extra
item callback runs and the captured original reference is returned. Callback
mutations and failures retain their native prefix.
`python3 tools/test_use_remainder_parity.py` compares actual UseRemainder with
native template creation. The
[remainder report](../benchmarks/rust-use-remainder-2026-10-07/scoped-parity.json)
records **353,264 matching lines per JAR**, including canonical EMPTY creation,
empty-but-distinct inputs, reference replacement and callback failures. Targeted
Clippy passes. The concrete actor inventory/drop handler, contained-component
validation, finish-use side effects and complete gameplay integration remain
pending.
mods/horizon/src/test/java/dev/horizonlab/parity/VanillaUseRemainderOracle.java
+40
View File
@@ -0,0 +1,40 @@
package dev.horizonlab.parity;
import com.google.gson.*;import java.io.*;import java.lang.reflect.*;import java.nio.file.*;import java.util.*;
import net.minecraft.core.component.*;import net.minecraft.world.item.*;
/** Native template construction, patch precedence, validation and rollback. */
public final class VanillaUseRemainderOracle {
static DataComponentType<Integer>[] keys;
static Item[] items;static Field components,count,patchMap;static Object removed;
static Field field(Class<?> c,String n)throws Exception{var f=c.getDeclaredField(n);f.setAccessible(true);return f;}
static String opt(Object o){return o==null||o==removed?"none":o.toString();}
static int kind(Item i){for(int k=0;k<items.length;k++)if(items[k]==i)return k;throw new AssertionError();}
static int key(Object k){for(int i=0;i<keys.length;i++)if(keys[i]==k)return i;throw new AssertionError();}
static DataComponentMap prototype(JsonArray a){var b=DataComponentMap.builder();for(var e:a){var p=e.getAsJsonArray();b.set(keys[p.get(0).getAsInt()],p.get(1).getAsInt());}return b.build();}
static DataComponentPatch patch(JsonArray a){var b=DataComponentPatch.builder();for(var e:a){var p=e.getAsJsonArray();if(p.get(1).isJsonNull())b.remove(keys[p.get(0).getAsInt()]);else b.set(keys[p.get(0).getAsInt()],p.get(1).getAsInt());}return b.build();}
static String patchText(DataComponentPatch p)throws Exception{var j=new StringJoiner(",");for(var e:((Map<?,?>)patchMap.get(p)).entrySet())j.add(key(e.getKey())+"="+opt(e.getValue()));return j.toString();}
static void all(PrintWriter out,ItemStack[] stacks,ItemStackTemplate[] templates)throws Exception{
for(int i=0;i<3;i++){var s=stacks[i];var v=new StringJoiner(",");for(var k:keys)v.add(opt(s.get(k)));out.println("stack "+i+" "+(s==ItemStack.EMPTY)+" "+kind(s.getItem())+" "+count.getInt(s)+" "+s.getCount()+" "+s.getPopTime()+" "+s.isEmpty()+" "+ItemStack.validateStrict(s).isSuccess()+" | "+v+" | "+patchText(((PatchedDataComponentMap)components.get(s)).asPatch()));}
for(int i=0;i<3;i++){var t=templates[i];if(t==null){out.println("template "+i+" none");continue;}var v=new StringJoiner(",");for(var k:keys)v.add(opt(t.get(k)));out.println("template "+i+" "+kind(t.item().value())+" "+t.count()+" | "+v+" | "+patchText(t.components()));}
for(int a=0;a<3;a++)for(int b=a+1;b<3;b++)out.println("same "+a+" "+b+" "+(stacks[a]==stacks[b])+" "+(templates[a]==templates[b]));
}
public static void main(String[] args)throws Exception{
net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();keys=new DataComponentType[]{DataComponents.MAX_STACK_SIZE,DataComponents.MAX_DAMAGE,DataComponents.DAMAGE};items=new Item[]{Items.AIR,Items.STICK,Items.SHIELD};components=field(ItemStack.class,"components");count=field(ItemStack.class,"count");patchMap=field(DataComponentPatch.class,"map");removed=field(Class.forName("net.minecraft.core.component.Removed"),"INSTANCE").get(null);
Path dir=Path.of(args[1]);try(var out=new PrintWriter(Files.newBufferedWriter(dir.resolve(args[0]+".txt")));var lines=Files.lines(dir.resolve("inputs.txt"))){for(var line:(Iterable<String>)lines::iterator){var f=JsonParser.parseString(line).getAsJsonObject();for(int i=0;i<3;i++)items[i].builtInRegistryHolder().bindComponents(prototype(f.getAsJsonArray("prototypes").get(i).getAsJsonArray()));ItemStack.EMPTY.setCount(0);ItemStack.EMPTY.setPopTime(0);((PatchedDataComponentMap)components.get(ItemStack.EMPTY)).clearPatch();var stacks=new ItemStack[3];var templates=new ItemStackTemplate[3];for(int i=0;i<3;i++){var v=f.getAsJsonArray("stacks").get(i).getAsJsonObject();int id=v.get("item").getAsInt();stacks[i]=id<0?ItemStack.EMPTY:new ItemStack(items[id],v.get("count").getAsInt());if(id>=0){stacks[i].setPopTime(5);((PatchedDataComponentMap)components.get(stacks[i])).restorePatch(patch(v.getAsJsonArray("patch")));}}all(out,stacks,templates);
for(var ov:f.getAsJsonArray("ops")){var op=ov.getAsJsonObject();int a=op.get("a").getAsInt(),b=op.get("b").getAsInt(),n=op.get("count").getAsInt();try{switch(op.get("kind").getAsString()){
case "convert":{var t=Objects.requireNonNull(templates[op.get("template").getAsInt()]);stacks[b]=new net.minecraft.world.item.component.UseRemainder(t).convertIntoRemainder(stacks[a],n,op.get("infinite").getAsBoolean(),extra->{out.println("extra "+(extra==ItemStack.EMPTY)+" "+kind(extra.getItem())+" "+extra.getCount());if(op.get("fail").getAsInt()==1)throw new IllegalStateException();extra.setCount(op.get("extra_count").getAsInt());stacks[a].setCount(op.get("source_count").getAsInt());int replace=op.get("replace").getAsInt();if(replace>=0)stacks[a]=stacks[replace];stacks[2]=extra;if(op.get("fail").getAsInt()==2)throw new IllegalStateException();});break;}
case "new":templates[b]=new ItemStackTemplate(items[op.get("item").getAsInt()].builtInRegistryHolder(),n,patch(op.getAsJsonArray("patch")));break;
case "from":templates[b]=ItemStackTemplate.fromStack(stacks[a]);break;
case "from-nonempty":templates[b]=ItemStackTemplate.fromNonEmptyStack(stacks[a]);break;
case "from-count":templates[b]=ItemStackTemplate.fromNonEmptyStack(stacks[a],n);break;
case "with":templates[b]=templates[a].withCount(n);break;
case "create":stacks[b]=templates[a].create();break;
case "apply":stacks[b]=templates[a].apply(patch(op.getAsJsonArray("patch")));break;
case "apply-count":stacks[b]=templates[a].apply(n,patch(op.getAsJsonArray("patch")));break;
case "validate-patch":stacks[a].applyComponentsAndValidate(patch(op.getAsJsonArray("patch")));break;
case "count":stacks[a].setCount(n);break;
case "prototype":items[op.get("item").getAsInt()].builtInRegistryHolder().bindComponents(prototype(op.getAsJsonArray("prototype")));break;
default:throw new AssertionError();}out.println("result ok");}catch(IllegalStateException|NullPointerException e){out.println("result error");}all(out,stacks,templates);
}
}}
}
}
tools/test_use_remainder_parity.py
+75
View File
@@ -0,0 +1,75 @@
#!/usr/bin/env python3
"""Compare native use remainders and strict scalar stack validation."""
import argparse
import json
import os
from pathlib import Path
import platform
import subprocess
import random
import struct
import math
try:
from . import lab, test_rust_parity as base
except ImportError:
import lab
import test_rust_parity as base
def corpus():
edges=[-2147483648,-1,0,1,2,64,99,2147483647]
def op(kind,**kw):
v=dict(kind=kind,a=0,b=1,count=1,item=1,patch=[],prototype=[],template=0,infinite=False,fail=0,extra_count=2,source_count=3,replace=-1);v.update(kw);return v
def row(item=1,count=1,ops=None):
return dict(prototypes=[[],[[0,64]],[[0,1],[1,10],[2,0]]],stacks=[dict(item=item,count=count,patch=[]),dict(item=2,count=1,patch=[]),dict(item=-1,count=0,patch=[])],ops=ops or [])
for count in edges:
for before in edges:
for item in [-1,0,1,2]:
for infinite in [False,True]:
for patch in [[],[[0,1],[1,10]],[[0,0]],[[0,99]]]:
yield row(item,count,[op('new',count=2,patch=patch,b=0),op('convert',count=before,infinite=infinite)])
for fail in range(3):
for replace in [-1,0,1,2]:
for extra_count in edges:
for source_count in edges:
yield row(1,1,[op('new',b=0),op('convert',count=2,fail=fail,replace=replace,extra_count=extra_count,source_count=source_count),op('convert',count=3)])
rng=random.Random(0x52454d41494e4445)
for _ in range(2400):
ops=[op('new',b=0,count=rng.choice([n for n in edges if n]),item=rng.choice([1,2]),patch=[[0,rng.choice(edges)]])]
for __ in range(rng.randrange(2,8)):
ops.extend([op('count',a=rng.randrange(3),count=rng.choice(edges)),op('convert',a=rng.randrange(3),b=rng.randrange(3),count=rng.choice(edges),infinite=bool(rng.randrange(2)),fail=rng.randrange(3),replace=rng.randrange(-1,3),source_count=rng.choice(edges),extra_count=rng.choice(edges))])
yield row(rng.randrange(-1,3),rng.choice(edges),ops)
def main():
parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
build=lab.LOCAL/'rust-use-remainder-parity';build.mkdir(parents=True,exist_ok=True)
report_path=build/'report.json';report_path.unlink(missing_ok=True)
if args.prepare:lab.prepare()
lock,jars,libraries=base.verify_artifacts()
oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaUseRemainderOracle.java'
sources=[oracle,Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/lab.py',lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-core/Cargo.toml',lab.ROOT/'crates/horizon-world/Cargo.toml',*sorted((lab.ROOT/'crates/horizon-core/src').rglob('*.rs')),*sorted((lab.ROOT/'crates/horizon-world/src').rglob('*.rs')),lab.ROOT/'crates/horizon-world/examples/use_remainder_fixture.rs']
tested_sources=base.source_hashes(sources)
classes=build/'classes';classes.mkdir(exist_ok=True)
def run(command,name):
with (build/(name+'.log')).open('w',encoding='utf-8') as log:base.run(list(map(str,command)),stdout=log,stderr=subprocess.STDOUT)
dependency_path=os.pathsep.join(map(str,libraries))
run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependency_path,'-d',classes,oracle],'compile-java')
def java(side,mode,path):
run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaUseRemainderOracle',mode,path],side+'-'+mode)
fixtures=list(corpus());inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
fixture_paths=[inputs];tested_fixtures=base.source_hashes(fixture_paths)
run(['cargo','build','--release','-p','horizon-world','--example','use_remainder_fixture'],'compile-rust')
metadata=json.loads(subprocess.check_output(['cargo','metadata','--no-deps','--format-version','1'],cwd=lab.ROOT,text=True))
binary=Path(metadata['target_directory'])/'release/examples'/('use_remainder_fixture.exe' if os.name=='nt' else 'use_remainder_fixture')
run([binary,build],'rust');references=[]
for side,jar in jars.items():
java(side,side,build);reference=build/f'{side}.txt';matched=base.compare(reference,build/'rust.txt')
references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(reference,'sha256'),'matched_output_lines':matched})
print(f'{side}: {matched:,} use remainder output lines match Rust',flush=True)
base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged(fixture_paths,tested_fixtures)
report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,'scope':'Actual UseRemainder.convertIntoRemainder composed with native ItemStackTemplate creation/validation and shared ItemStack references. Covers finite/infinite materials, visible count comparisons, exhausted and empty-but-distinct inputs, invalid templates returning canonical EMPTY, extra-item callbacks with mutations/failures, and captured-reference identity. Rust uses its item-template factory with scalar validation; contained component validation, concrete actor inventory insertion/drop, item finish side effects and complete gameplay integration remain pending.'}
lab.write_json(report_path,report);print(f'Scoped use remainder parity passed: {report_path}')
if __name__=='__main__':main()