rust/tests/rustdoc-js/assoc-type-backtrack.js
Michael Howell 12dc24f460 rustdoc-search: simplify rules for generics and type params
This commit is a response to feedback on the displayed type
signatures results, by making generics act stricter.

Generics are tightened by making order significant. This means
`Vec<Allocator>` now matches only with a true vector of allocators,
instead of matching the second type param. It also makes unboxing
within generics stricter, so `Result<A, B>` only matches if `B`
is in the error type and `A` is in the success type. The top level
of the function search is unaffected.

Find the discussion on:

* <https://rust-lang.zulipchat.com/#narrow/stream/393423-t-rustdoc.2Fmeetings/topic/meeting.202024-07-08/near/449965149>
* <https://github.com/rust-lang/rust/pull/124544#issuecomment-2204272265>
* <https://rust-lang.zulipchat.com/#narrow/channel/266220-t-rustdoc/topic/deciding.20on.20semantics.20of.20generics.20in.20rustdoc.20search/near/476841363>
2024-10-30 12:27:48 -07:00

182 lines
5.6 KiB
JavaScript

// exact-check
const EXPECTED = [
{
'query': 'mytrait, mytrait2 -> T',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyTrait', 'name': 'fold' },
],
},
{
'query': 'mytrait<U>, mytrait2 -> T',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyTrait', 'name': 'fold' },
],
},
{
'query': 'cloned<mytrait>, mytrait2 -> T',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::Cloned', 'name': 'fold' },
],
},
{
'query': 'cloned<mytrait<U>>, mytrait2 -> T',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::Cloned', 'name': 'fold' },
],
},
{
'query': 'mytrait<Item=U>, mytrait2 -> T',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyTrait', 'name': 'fold' },
],
},
{
'query': 'mytrait<T>, mytrait2 -> T',
'correction': null,
'others': [],
},
{
'query': 'mytrait<Item=T>, mytrait2 -> T',
'correction': null,
'others': [],
},
{
'query': 'mytrait<T> -> Option<T>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyTrait', 'name': 'next' },
],
},
{
'query': 'mytrait<Item=T> -> Option<T>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyTrait', 'name': 'next' },
],
},
{
'query': 'cloned<mytrait<U>> -> Option<T>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::Cloned', 'name': 'next' },
],
},
{
'query': 'cloned<mytrait<Item=U>> -> Option<T>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::Cloned', 'name': 'next' },
],
},
// The first two define the base case.
{
'query': 'myintofuture<fut=myfuture<t>> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future' },
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<fut=myfuture<t>>, myintofuture<fut=myfuture<t>> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
// Unboxings of the one-argument case.
{
'query': 'myfuture<t> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future' },
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<t, myfuture<t>> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future' },
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
// Unboxings of the one-argument case.
{
'query': 'myintofuture<fut=t> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future' },
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
// Unboxings of the two-argument case.
{
'query': 'myintofuture<fut=t>, myintofuture<fut=t> -> t',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<fut=myfuture>, myintofuture<fut=myfuture> -> myfuture',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<t, myfuture>, myintofuture<t, myfuture> -> myfuture',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myfuture<t>, myfuture<t> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
// If you unbox one of the myfutures, you don't need to unbox all of them.
{
'query': 'myintofuture<fut=t>, myintofuture<fut=myfuture<t>> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<fut=myfuture<t>>, myintofuture<fut=t> -> myfuture<t>',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
{
'query': 'myintofuture<fut=myfuture<t>>, myintofuture<fut=myfuture<t>> -> t',
'correction': null,
'others': [
{ 'path': 'assoc_type_backtrack::MyIntoFuture', 'name': 'into_future_2' },
],
},
// different generics must match up
{
'query': 'myintofuture<fut=myfuture<u>>, myintofuture<fut=myfuture<t>> -> myfuture<t>',
'correction': null,
'others': [],
},
{
'query': 'myintofuture<output=t> -> myfuture<tt>',
'correction': null,
'others': [],
},
];