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Improve cached queries

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Ukendio 2025-01-14 11:09:18 +01:00
parent f8b3772bce
commit 6123946e11
5 changed files with 218 additions and 433 deletions
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2
benches/query.luau
View file

@ -9,7 +9,7 @@ local function TITLE(title: string)
end end
local jecs = require("@jecs") local jecs = require("@jecs")
local mirror = require("../mirror/init") local mirror = require("@mirror")
type i53 = number type i53 = number

139
demo/src/ReplicatedStorage/std/changetracker.luau
View file

@ -1,139 +0,0 @@
local jecs = require(game:GetService("ReplicatedStorage").ecs)
type World = jecs.World
type Tracker<T> = {
track: (
world: World,
fn: (
changes: {
added: () -> () -> (number, T),
removed: () -> () -> number,
changed: () -> () -> (number, T, T),
}
) -> ()
) -> (),
}
type Entity<T = any> = number & { __nominal_type_dont_use: T }
local function diff(a, b)
local size = 0
for k, v in a do
if b[k] ~= v then
return true
end
size += 1
end
for k, v in b do
size -= 1
end
if size ~= 0 then
return true
end
return false
end
local function ChangeTracker<T>(world: World, T: Entity<T>): Tracker<T>
local sparse = world.entityIndex.sparse
local PreviousT = jecs.pair(jecs.Rest, T)
local add = {}
local added
local removed
local is_trivial
local function changes_added()
added = true
local q = world:query(T):without(PreviousT):drain()
return function()
local id, data = q.next()
if not id then
return nil
end
is_trivial = typeof(data) ~= "table"
add[id] = data
return id, data
end
end
local function changes_changed()
local q = world:query(T, PreviousT):drain()
return function()
local id, new, old = q.next()
while true do
if not id then
return nil
end
if not is_trivial then
if diff(new, old) then
break
end
elseif new ~= old then
break
end
id, new, old = q.next()
end
local record = sparse[id]
local archetype = record.archetype
local column = archetype.records[PreviousT].column
local data = if is_trivial then new else table.clone(new)
archetype.columns[column][record.row] = data
return id, old, new
end
end
local function changes_removed()
removed = true
local q = world:query(PreviousT):without(T):drain()
return function()
local id = q.next()
if id then
world:remove(id, PreviousT)
end
return id
end
end
local changes = {
added = changes_added,
changed = changes_changed,
removed = changes_removed,
}
local function track(fn)
added = false
removed = false
fn(changes)
if not added then
for _ in changes_added() do
end
end
if not removed then
for _ in changes_removed() do
end
end
for e, data in add do
world:set(e, PreviousT, if is_trivial then data else table.clone(data))
end
end
local tracker = { track = track }
return tracker
end
return ChangeTracker

221
examples/luau/queries/changetracking.luau
View file

@ -1,164 +1,5 @@
local jecs = require("@jecs") local jecs = require("@jecs")
type World = jecs.WorldShim
type Tracker<T> = {
track: (
world: World,
fn: (
changes: {
added: () -> () -> (number, T),
removed: () -> () -> number,
changed: () -> () -> (number, T, T),
}
) -> ()
) -> (),
}
local function diff(a, b)
local size = 0
for k, v in a do
if b[k] ~= v then
return true
end
size += 1
end
for k, v in b do
size -= 1
end
if size ~= 0 then
return true
end
return false
end
type Entity<T> = number & { __nominal_type_dont_use: T }
local function ChangeTracker<T>(world, T: Entity<T>): Tracker<T>
local PreviousT = jecs.pair(jecs.Rest, T)
local add = {}
local added
local removed
local is_trivial
local function changes_added()
added = true
local q = world:query(T):without(PreviousT):drain()
return function()
local id, data = q.next()
if not id then
return nil
end
is_trivial = typeof(data) ~= "table"
add[id] = data
return id, data
end
end
local function changes_changed()
local q = world:query(T, PreviousT):drain()
return function()
local id, new, old = q.next()
while true do
if not id then
return nil
end
if not is_trivial then
if diff(new, old) then
break
end
elseif new ~= old then
break
end
id, new, old = q.next()
end
add[id] = new
return id, old, new
end
end
local function changes_removed()
removed = true
local q = world:query(PreviousT):without(T):drain()
return function()
local id = q.next()
if id then
world:remove(id, PreviousT)
end
return id
end
end
local changes = {
added = changes_added,
changed = changes_changed,
removed = changes_removed,
}
local function track(fn)
added = false
removed = false
fn(changes)
if not added then
for _ in changes_added() do
end
end
if not removed then
for _ in changes_removed() do
end
end
for e, data in add do
world:set(e, PreviousT, if is_trivial then data else table.clone(data))
end
end
local tracker = { track = track }
return tracker
end
local Vector3
do
Vector3 = {}
Vector3.__index = Vector3
function Vector3.new(x, y, z)
x = x or 0
y = y or 0
z = z or 0
return setmetatable({ X = x, Y = y, Z = z }, Vector3)
end
function Vector3.__add(left, right)
return Vector3.new(left.X + right.X, left.Y + right.Y, left.Z + right.Z)
end
function Vector3.__mul(left, right)
if typeof(right) == "number" then
return Vector3.new(left.X * right, left.Y * right, left.Z * right)
end
return Vector3.new(left.X * right.X, left.Y * right.Y, left.Z * right.Z)
end
Vector3.one = Vector3.new(1, 1, 1)
Vector3.zero = Vector3.new()
end
local world = jecs.World.new() local world = jecs.World.new()
local Name = world:component() local Name = world:component()
@ -171,10 +12,21 @@ local function name(e)
return world:get(e, Name) return world:get(e, Name)
end end
local Position = named(world.component, "Position") local Position = named(world.component, "Position") :: jecs.Entity<Vector3>
local Previous = jecs.Rest
local PreviousPosition = jecs.pair(Previous, Position)
-- Create the ChangeTracker with the component type to track local added = world
local PositionTracker = ChangeTracker(world, Position) :query(Position)
:without(PreviousPosition)
:cached()
local changed = world
:query(Position, PreviousPosition)
:cached()
local removed = world
:query(PreviousPosition)
:without(Position)
:cached()
local e1 = named(world.entity, "e1") local e1 = named(world.entity, "e1")
world:set(e1, Position, Vector3.new(10, 20, 30)) world:set(e1, Position, Vector3.new(10, 20, 30))
@ -182,52 +34,25 @@ world:set(e1, Position, Vector3.new(10, 20, 30))
local e2 = named(world.entity, "e2") local e2 = named(world.entity, "e2")
world:set(e2, Position, Vector3.new(10, 20, 30)) world:set(e2, Position, Vector3.new(10, 20, 30))
PositionTracker.track(function(changes) for e, p in added:iter() do
-- You can iterate over different types of changes: Added, Changed, Removed
-- added queries for every entity with a new Position component
for e, p in changes.added() do
print(`Added {e}: \{{p.X}, {p.Y}, {p.Z}}`) print(`Added {e}: \{{p.X}, {p.Y}, {p.Z}}`)
world:set(e, PreviousPosition, p)
end end
-- changed queries for entities who's changed their data since world:set(e1, Position, "")
-- last was it tracked
for _ in changes.changed() do for e, new, old in changed:iter() do
print([[This won't print because it is the first time if new ~= old then
we are tracking the Position component]]) print(`{name(new)}'s Position changed from \{{old.X}, {old.Y}, {old.Z}\} to \{{new.X}, {new.Y}, {new.Z}\}`)
world:set(e, PreviousPosition, new)
end end
-- removed queries for entities who's removed their Position component
-- since last it was tracked
for _ in changes.removed() do
print([[This won't print because it is the first time
we are tracking the Position component]])
end end
end)
world:set(e1, Position, Vector3.new(1, 1, 2) * 999)
PositionTracker.track(function(changes)
for e, p in changes.added() do
print([[This won't never print no Position component was added
since last time we tracked]])
end
for e, old, new in changes.changed() do
print(`{name(e)}'s Position changed from \{{old.X}, {old.Y}, {old.Z}\} to \{{new.X}, {new.Y}, {new.Z}\}`)
end
-- If you don't call e.g. changes.removed() then it will automatically drain its iterator and stage their changes.
-- This ensures you will not have any off-by-one frame errors.
end)
world:remove(e2, Position) world:remove(e2, Position)
PositionTracker.track(function(changes) for e in removed:iter() do
for e in changes.removed() do
print(`Position was removed from {name(e)}`) print(`Position was removed from {name(e)}`)
end end
end)
-- Output: -- Output:
-- Added 265: {10, 20, 30} -- Added 265: {10, 20, 30}

213
jecs.luau
View file

@ -222,7 +222,7 @@ local function entity_index_is_alive(entity_index: EntityIndex, entity: number)
return entity_index_try_get(entity_index, entity) ~= nil return entity_index_try_get(entity_index, entity) ~= nil
end end
local function entity_index_new_id(entity_index: EntityIndex, data): i53 local function entity_index_new_id(entity_index: EntityIndex): i53
local dense_array = entity_index.dense_array local dense_array = entity_index.dense_array
local alive_count = entity_index.alive_count local alive_count = entity_index.alive_count
if alive_count ~= #dense_array then if alive_count ~= #dense_array then
@ -1116,7 +1116,7 @@ do
local delete = entity local delete = entity
local component_index = world.componentIndex local component_index = world.componentIndex
local archetypes = world.archetypes local archetypes: Archetypes = world.archetypes
local tgt = ECS_PAIR(EcsWildcard, delete) local tgt = ECS_PAIR(EcsWildcard, delete)
local idr_t = component_index[tgt] local idr_t = component_index[tgt]
local idr = component_index[delete] local idr = component_index[delete]
@ -1232,6 +1232,15 @@ local EMPTY_QUERY = {
setmetatable(EMPTY_QUERY, EMPTY_QUERY) setmetatable(EMPTY_QUERY, EMPTY_QUERY)
type QueryInner = {
compatible_archetypes: { Archetype },
ids: { i53 },
filter_with: { i53 },
filter_without: { i53 },
next: () -> (number, ...any),
world: World,
}
local function query_iter_init(query: QueryInner): () -> (number, ...any) local function query_iter_init(query: QueryInner): () -> (number, ...any)
local world_query_iter_next local world_query_iter_next
@ -1309,6 +1318,9 @@ local function query_iter_init(query: QueryInner): () -> (number, ...any)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1332,6 +1344,9 @@ local function query_iter_init(query: QueryInner): () -> (number, ...any)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1356,6 +1371,9 @@ local function query_iter_init(query: QueryInner): () -> (number, ...any)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1381,6 +1399,9 @@ local function query_iter_init(query: QueryInner): () -> (number, ...any)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1408,6 +1429,9 @@ local function query_iter_init(query: QueryInner): () -> (number, ...any)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1547,45 +1571,6 @@ local function query_archetypes(query)
end end
local function query_cached(query: QueryInner) local function query_cached(query: QueryInner)
local archetypes = query.compatible_archetypes
local world = query.world :: World
-- Only need one observer for EcsArchetypeCreate and EcsArchetypeDelete respectively
-- because the event will be emitted for all components of that Archetype.
local first = query.ids[1]
local observerable = world.observerable
local on_create_action = observerable[EcsOnArchetypeCreate]
if not on_create_action then
on_create_action = {}
observerable[EcsOnArchetypeCreate] = on_create_action
end
local query_cache_on_create = on_create_action[first]
if not query_cache_on_create then
query_cache_on_create = {}
on_create_action[first] = query_cache_on_create
end
local on_delete_action = observerable[EcsOnArchetypeDelete]
if not on_delete_action then
on_delete_action = {}
observerable[EcsOnArchetypeDelete] = on_delete_action
end
local query_cache_on_delete = on_delete_action[first]
if not query_cache_on_delete then
query_cache_on_delete = {}
on_delete_action[first] = query_cache_on_delete
end
local function on_create_callback(archetype)
table.insert(archetypes, archetype)
end
local function on_delete_callback(archetype)
local i = table.find(archetypes, archetype) :: number
local n = #archetypes
archetypes[i] = archetypes[n]
archetypes[n] = nil
end
local with = query.filter_with local with = query.filter_with
local ids = query.ids local ids = query.ids
if with then if with then
@ -1594,12 +1579,6 @@ local function query_cached(query: QueryInner)
query.filter_with = ids query.filter_with = ids
end end
local observer_for_create = { query = query, callback = on_create_callback }
local observer_for_delete = { query = query, callback = on_delete_callback }
table.insert(query_cache_on_create, observer_for_create)
table.insert(query_cache_on_delete, observer_for_delete)
local compatible_archetypes = query.compatible_archetypes local compatible_archetypes = query.compatible_archetypes
local lastArchetype = 1 local lastArchetype = 1
@ -1613,6 +1592,50 @@ local function query_cached(query: QueryInner)
local i: number local i: number
local archetype: Archetype local archetype: Archetype
local records: { ArchetypeRecord } local records: { ArchetypeRecord }
local archetypes = query.compatible_archetypes
local world = query.world :: World
-- Only need one observer for EcsArchetypeCreate and EcsArchetypeDelete respectively
-- because the event will be emitted for all components of that Archetype.
local observerable = world.observerable
local on_create_action = observerable[EcsOnArchetypeCreate]
if not on_create_action then
on_create_action = {}
observerable[EcsOnArchetypeCreate] = on_create_action
end
local query_cache_on_create = on_create_action[A]
if not query_cache_on_create then
query_cache_on_create = {}
on_create_action[A] = query_cache_on_create
end
local on_delete_action = observerable[EcsOnArchetypeDelete]
if not on_delete_action then
on_delete_action = {}
observerable[EcsOnArchetypeDelete] = on_delete_action
end
local query_cache_on_delete = on_delete_action[A]
if not query_cache_on_delete then
query_cache_on_delete = {}
on_delete_action[A] = query_cache_on_delete
end
local function on_create_callback(archetype)
table.insert(archetypes, archetype)
end
local function on_delete_callback(archetype)
local i = table.find(archetypes, archetype) :: number
local n = #archetypes
archetypes[i] = archetypes[n]
archetypes[n] = nil
end
local observer_for_create = { query = query, callback = on_create_callback }
local observer_for_delete = { query = query, callback = on_delete_callback }
table.insert(query_cache_on_create, observer_for_create)
table.insert(query_cache_on_delete, observer_for_delete)
local function cached_query_iter() local function cached_query_iter()
lastArchetype = 1 lastArchetype = 1
@ -1685,6 +1708,9 @@ local function query_cached(query: QueryInner)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1708,6 +1734,9 @@ local function query_cached(query: QueryInner)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1732,6 +1761,9 @@ local function query_cached(query: QueryInner)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1757,6 +1789,9 @@ local function query_cached(query: QueryInner)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1784,6 +1819,9 @@ local function query_cached(query: QueryInner)
entities = archetype.entities entities = archetype.entities
i = #entities i = #entities
if i == 0 then
continue
end
entityId = entities[i] entityId = entities[i]
columns = archetype.columns columns = archetype.columns
records = archetype.records records = archetype.records
@ -1939,7 +1977,7 @@ local function world_each(world: World, id): () -> ()
return function(): any return function(): any
local entity = entities[row] local entity = entities[row]
while not entity do while not entity do
archetype_id = next(idr_cache, archetype_id) archetype_id = next(idr_cache, archetype_id) :: number
if not archetype_id then if not archetype_id then
return return
end end
@ -2141,31 +2179,33 @@ function World.new()
return self return self
end end
type Id<T = unknown> = export type Id<T = nil> =
| (number & { __jecs_pair_value: T }) | Entity<T>
| (number & { __T: T }) | Pair<Entity<T>, Entity>
| Pair<Entity, Entity<T>>
| Pair<Entity<T>, Entity<unknown>>
export type Pair<P = Entity, O = Entity> = number & { export type Pair<P, O> = number & {
__jecs_pair_value: ecs_id_t<ecs_pair_t<P, O>> __P: P,
__O: O,
} }
type function ecs_id_t(entity) -- type function ecs_id_t(entity)
local ty = entity:components()[2] -- local ty = entity:components()[2]
local __T = ty:readproperty(types.singleton("__T")) -- local __T = ty:readproperty(types.singleton("__T"))
if not __T then -- if not __T then
return ty:readproperty(types.singleton("__jecs_pair_value")) -- return ty:readproperty(types.singleton("__jecs_pair_value"))
end -- end
return __T -- return __T
end -- end
type function ecs_pair_t(first, second) -- type function ecs_pair_t(first, second)
local ty = first:components()[2] -- if ecs_id_t(first):is("nil") then
if ty:readproperty(types.singleton("__T")):is("nil") then -- return second
return second -- else
else -- return first
return first -- end
end -- end
end
type Item<T...> = (self: Query<T...>) -> (Entity, T...) type Item<T...> = (self: Query<T...>) -> (Entity, T...)
@ -2183,15 +2223,6 @@ export type Query<T...> = typeof(setmetatable({}, {
cached: (self: Query<T...>) -> Query<T...>, cached: (self: Query<T...>) -> Query<T...>,
} }
type QueryInner = {
compatible_archetypes: { Archetype },
filter_with: { i53 }?,
filter_without: { i53 }?,
ids: { i53 },
world: {}, -- Downcasted to be serializable by the analyzer
next: () -> Item<any>
}
type Observer = { type Observer = {
callback: (archetype: Archetype) -> (), callback: (archetype: Archetype) -> (),
query: QueryInner, query: QueryInner,
@ -2208,7 +2239,13 @@ export type World = {
nextEntityId: number, nextEntityId: number,
nextArchetypeId: number, nextArchetypeId: number,
observerable: { [i53]: { [i53]: { { query: Query<i53> } } } }, observerable: {
[i53]: {
[i53]: {
{ query: QueryInner, callback: (Archetype) -> () }
}
}
},
} & { } & {
--- Creates a new entity --- Creates a new entity
entity: (self: World) -> Entity, entity: (self: World) -> Entity,
@ -2251,18 +2288,18 @@ export type World = {
children: (self: World, id: Id) -> () -> Entity, children: (self: World, id: Id) -> () -> Entity,
--- Searches the world for entities that match a given query --- Searches the world for entities that match a given query
query: (<A>(World, A) -> Query<ecs_id_t<A>>) query: (<A>(World, Id<A>) -> Query<A>)
& (<A, B>(World, A, B) -> Query<ecs_id_t<A>, ecs_id_t<B>>) & (<A, B>(World, Id<A>, Id<B>) -> Query<A, B>)
& (<A, B, C>(World, A, B, C) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>>) & (<A, B, C>(World, Id<A>, Id<B>, Id<C>) -> Query<A, B, C>)
& (<A, B, C, D>(World, A, B, C, D) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>, ecs_id_t<D>>) & (<A, B, C, D>(World, Id<A>, Id<B>, Id<C>, Id<D>) -> Query<A, B, C, D>)
& (<A, B, C, D, E>(World, A, B, C, D, E) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>, ecs_id_t<D>, ecs_id_t<E>>) & (<A, B, C, D, E>(World, Id<A>, Id<B>, Id<C>, Id<D>, Id<E>) -> Query<A, B, C, D, E>)
& (<A, B, C, D, E, F>(World, A, B, C, D, E, F) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>, ecs_id_t<D>, ecs_id_t<E>, ecs_id_t<F>>) & (<A, B, C, D, E, F>(World, Id<A>, Id<B>, Id<C>, Id<D>, Id<E>, Id<F>) -> Query<A, B, C, D, E, F>)
& (<A, B, C, D, E, F, G>(World, A, B, C, D, E, F, G) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>, ecs_id_t<D>, ecs_id_t<E>, ecs_id_t<F>, ecs_id_t<G>>) & (<A, B, C, D, E, F, G>(World, Id<A>, Id<B>, Id<C>, Id<D>, Id<E>, Id<F>, Id<G>) -> Query<A, B, C, D, E, F, G>)
& (<A, B, C, D, E, F, G, H>(World, A, B, C, D, E, F, G, H) -> Query<ecs_id_t<A>, ecs_id_t<B>, ecs_id_t<C>, ecs_id_t<D>, ecs_id_t<E>, ecs_id_t<F>, ecs_id_t<G>, ecs_id_t<H>>) & (<A, B, C, D, E, F, G, H>(World, Id<A>, Id<B>, Id<C>, Id<D>, Id<E>, Id<F>, Id<G>, Id<H>, ...Id<any>) -> Query<A, B, C, D, E, F, G, H>)
} }
return { return {
World = World :: { new: () -> World }, World = World,
OnAdd = EcsOnAdd :: Entity<(entity: Entity) -> ()>, OnAdd = EcsOnAdd :: Entity<(entity: Entity) -> ()>,
OnRemove = EcsOnRemove :: Entity<(entity: Entity) -> ()>, OnRemove = EcsOnRemove :: Entity<(entity: Entity) -> ()>,

62
test/tests.luau
View file

@ -374,9 +374,12 @@ TEST("world:query()", function()
world:set(e, Bar, false) world:set(e, Bar, false)
local i = 0 local i = 0
local iter = 0
for _, e in q:iter() do for _, e in q:iter() do
iter += 1
i=1 i=1
end end
CHECK (iter == 1)
CHECK(i == 1) CHECK(i == 1)
for _, e in q:iter() do for _, e in q:iter() do
i=2 i=2
@ -1364,6 +1367,65 @@ TEST("Hooks", function()
end end
end) end)
TEST("change tracking", function()
CASE "#1" do
local world = world_new()
local Foo = world:component()
local Previous = jecs.Rest
local q1 = world
:query(Foo)
:without(pair(Previous, Foo))
:cached()
local e1 = world:entity()
world:set(e1, Foo, 1)
local e2 = world:entity()
world:set(e2, Foo, 2)
local i = 0
for e, new in q1 do
i += 1
world:set(e, pair(Previous, Foo), new)
end
CHECK(i == 2)
local j = 0
for e, new in q1 do
j += 1
world:set(e, pair(Previous, Foo), new)
end
CHECK(j == 0)
end
CASE "#2" do
local world = world_new()
local component = world:component()
local tag = world:entity()
local previous = jecs.Rest
local q1 = world:query(component):without(pair(previous, component), tag):cached()
local testEntity = world:entity()
world:set(testEntity, component, 10)
local i = 0
for entity, number in q1 do
i += 1
world:add(testEntity, tag)
end
CHECK(i == 1)
for e, n in q1 do
world:set(e, pair(previous, component), n)
end
end
end)
TEST("repro", function() TEST("repro", function()
do CASE "#1" do CASE "#1"
local world = world_new() local world = world_new()