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bors d4822c2d84 Auto merge of #127589 - notriddle:notriddle/search-sem-3, r=GuillaumeGomez 
rustdoc-search: simplify rules for generics and type params

**Heads up!**: This PR is a follow-up that depends on #124544. It adds 12dc24f460, a change to the filtering behavior, and 9900ea48b5, a minor ranking tweak.

Part of https://github.com/rust-lang/rust-project-goals/issues/112

This PR overturns https://github.com/rust-lang/rust/pull/109802

## Preview

* no results: [`Box<[A]> -> Vec<B>`](http://notriddle.com/rustdoc-html-demo-12/search-sem-3/std/index.html?search=Box%3C%5BA%5D%3E%20-%3E%20Vec%3CB%3E)
* results: [`Box<[A]> -> Vec<A>`](http://notriddle.com/rustdoc-html-demo-12/search-sem-3/std/index.html?search=Box%3C%5BA%5D%3E%20-%3E%20Vec%3CA%3E)
* [`T -> U`](http://notriddle.com/rustdoc-html-demo-12/search-sem-3/std/index.html?search=T%20-%3E%20U)
* [`Cx -> TyCtxt`](http://notriddle.com/rustdoc-html-demo-12/search-sem-3-compiler/rustdoc/index.html?search=Cx%20-%3E%20TyCtxt)

![image](https://github.com/user-attachments/assets/015ae28c-7469-4f7f-be03-157d28d7ec97)

## Description

This commit is a response to feedback on the displayed type signatures results, by making generics act stricter.

- Order within generics is 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.
- Generics are only "unboxed" if a type is explicitly opted into it. References and tuples are hardcoded to allow unboxing, and Box, Rc, Arc, Option, Result, and Future are opted in with an unstable attribute. Search result unboxing is the process that allows you to search for `i32 -> str` and get back a function with the type signature `&Future<i32> -> Box<str>`.
- Instead of ranking by set overlap, it ranks by the number of items in the type signature. This makes it easier to find single type signatures like transmute.

## 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>
2024-11-11 12:26:00 +00:00
..
abi Add v8plus target feature to sparc and use it in create_object_file 2024-11-09 03:22:09 +09:00
alloc-error
allocator
annotate-snippet
anon-params
argfile
argument-suggestions
array-slice-vec
asm Stabilize Arm64EC inline assembly 2024-11-10 17:43:46 +09:00
associated-consts
associated-inherent-types
associated-item
associated-type-bounds
associated-types
async-await
attributes
auto-traits
autodiff
autoref-autoderef
auxiliary
backtrace
bench
binding
binop
blind
block-result
borrowck
box
btreemap
builtin-superkinds
c-variadic
cast
cfg
check-cfg Stabilize WebAssembly multivalue, reference-types, and tail-call target features 2024-11-10 07:45:14 -08:00
closure_context
closure-expected-type
closures
cmse-nonsecure
codegen
codemap_tests Add Unicode block-drawing compiler output support 2024-11-10 23:57:18 +01:00
coercion
coherence
coinduction
command
compare-method
compiletest-self-test
conditional-compilation
confuse-field-and-method
const_prop
const-generics
const-ptr
consts
coroutine
coverage-attr
crate-loading
cross
cross-crate
custom_test_frameworks
cycle-trait
debuginfo
definition-reachable
delegation
dep-graph
deprecation
deref-patterns
derived-errors
derives
deriving
dest-prop
destructuring-assignment
diagnostic_namespace
diagnostic-flags
diagnostic-width Add Unicode block-drawing compiler output support 2024-11-10 23:57:18 +01:00
did_you_mean
directory_ownership
disallowed-deconstructing
dollar-crate
drop
drop-bounds
dropck
dst
duplicate
dyn-compatibility
dyn-drop
dyn-keyword
dyn-star
dynamically-sized-types
editions
empty
entry-point
enum
enum-discriminant
env-macro
error-codes
error-emitter Add Unicode block-drawing compiler output support 2024-11-10 23:57:18 +01:00
errors
explicit
explicit-tail-calls
expr
extern
extern-flag
feature-gates Auto merge of #127589 - notriddle:notriddle/search-sem-3, r=GuillaumeGomez 2024-11-11 12:26:00 +00:00
ffi-attrs
float
fmt
fn
fn-main
for
for-loop-while
foreign
fuel
fully-qualified-type
function-pointer
functional-struct-update
functions-closures
generic-associated-types
generic-const-items
generics
half-open-range-patterns
hashmap
hello_world
higher-ranked
hygiene
illegal-sized-bound
impl-header-lifetime-elision
impl-trait Dont suggest use<APIT> 2024-11-09 19:41:53 +00:00
implied-bounds
imports
include-macros
incoherent-inherent-impls
indexing
inference
infinite
inherent-impls-overlap-check
inline-const
instrument-coverage
instrument-xray
interior-mutability
internal
internal-lints
intrinsics
invalid
invalid-compile-flags
invalid-module-declaration
invalid-self-argument
io-checks
issues
iterators Don't suggest .into_iter() on iterators 2024-11-08 17:43:13 -08:00
json
keyword
kindck
label
lang-items
late-bound-lifetimes
layout Auto merge of #132173 - veluca93:abi_checks, r=RalfJung,compiler-errors 2024-11-10 02:52:25 +00:00
lazy-type-alias
lazy-type-alias-impl-trait
let-else
lexer
lifetimes Rollup merge of #132363 - compiler-errors:raw-lt-id-valid, r=wesleywiser 2024-11-09 19:16:43 +01:00
limits
linkage-attr
lint Rollup merge of #132426 - Urgau:unreach_pub-super, r=petrochenkov 2024-11-10 22:20:35 +01:00
liveness
loops
lowering
lto
lub-glb
macro_backtrace
macros
malformed
manual
marker_trait_attr
match
meta
methods
mir
mir-dataflow
mismatched_types Add test for str for "expected primitive, found type" 2024-11-09 00:23:53 -06:00
missing
missing_non_modrs_mod
missing-trait-bounds
modules
modules_and_files_visibility
moves
mut
namespace
native-library-link-flags
never_type
nll
no_std
non_modrs_mods
non_modrs_mods_and_inline_mods
not-panic
numbers-arithmetic
numeric
object-lifetime
obsolete-in-place
offset-of
on-unimplemented
operator-recovery
or-patterns
overloaded
packed
panic-handler
panic-runtime
panics
parallel-rustc
parser Auto merge of #126597 - estebank:unicode-output, r=fmease 2024-11-11 00:00:58 +00:00
patchable-function-entry
pattern
pin-macro
polymorphization
precondition-checks
print_type_sizes
print-request
privacy
proc-macro
process
process-termination
ptr_ops
pub
qualified
query-system
range
raw-ref-op
reachable
recursion
recursion_limit
regions
repeat-expr
repr
reserved
resolve use verbose for path separator suggestion 2024-11-08 16:58:19 +00:00
return
rfcs Add more places where expressions can occur 2024-11-10 01:18:35 +01:00
rmeta
runtime
rust-2018
rust-2021
rust-2024
rustc-env
rustdoc
sanitizer
self
sepcomp
shadowed
shell-argfiles
simd
single-use-lifetime
sized
span
specialization
stability-attribute
stable-mir-print
stack-protector
static
statics
stats
std
stdlib-unit-tests
str
structs
structs-enums
suggestions use verbose for path separator suggestion 2024-11-08 16:58:19 +00:00
svh
symbol-mangling-version
symbol-names
sync
target-feature Add v9 and leoncasa target feature to sparc 2024-11-09 03:17:24 +09:00
test-attrs
thir-print
thread-local
threads-sendsync
tool-attributes
track-diagnostics
trait-bounds
traits give a hint which feature is missing 2024-11-09 23:32:06 +01:00
transmutability
transmute
treat-err-as-bug
trivial-bounds
try-block
try-trait
tuple
type
type-alias
type-alias-enum-variants
type-alias-impl-trait
type-inference
typeck
typeof
ufcs
unboxed-closures
underscore-imports
underscore-lifetime
uniform-paths
uninhabited
union
unknown-unstable-lints
unop
unpretty
unresolved
unsafe
unsized
unsized-locals
unused-crate-deps
unwind-abis
use
variance
variants
version
warnings
wasm Stabilize WebAssembly multivalue, reference-types, and tail-call target features 2024-11-10 07:45:14 -08:00
wf
where-clauses
while
windows-subsystem
zero-sized
.gitattributes
alias-uninit-value.rs
allow-non-lint-warnings.rs
anonymous-higher-ranked-lifetime.rs
anonymous-higher-ranked-lifetime.stderr
artificial-block.rs
as-precedence.rs
assign-assign.rs
assign-imm-local-twice.rs
assign-imm-local-twice.stderr
assoc-lang-items.rs
assoc-lang-items.stderr
assoc-oddities-3.rs
associated-path-shl.rs
associated-path-shl.stderr
atomic-from-mut-not-available.rs
atomic-from-mut-not-available.stderr
attempted-access-non-fatal.rs
attempted-access-non-fatal.stderr
attr-bad-crate-attr.rs
attr-bad-crate-attr.stderr
attr-shebang.rs
attr-start.rs
attr-usage-inline.rs
attr-usage-inline.stderr
attrs-resolution-errors.rs
attrs-resolution-errors.stderr
attrs-resolution.rs
augmented-assignments-feature-gate-cross.rs
augmented-assignments-rpass.rs
augmented-assignments.rs
augmented-assignments.stderr
auto-instantiate.rs
auto-ref-slice-plus-ref.rs
auto-ref-slice-plus-ref.stderr
autoderef-full-lval.rs
autoderef-full-lval.stderr
bare-fn-implements-fn-mut.rs
bare-static-string.rs
big-literals.rs
bind-by-move.rs
bitwise.rs
bogus-tag.rs
bogus-tag.stderr
borrow-by-val-method-receiver.rs
bounds-lifetime.rs
bounds-lifetime.stderr
break-diverging-value.rs
break-diverging-value.stderr
builtin-clone-unwind.rs
can-copy-pod.rs
cancel-clean-via-immediate-rvalue-ref.rs
cannot-mutate-captured-non-mut-var.rs
cannot-mutate-captured-non-mut-var.stderr
capture1.rs
capture1.stderr
catch-unwind-bang.rs
cenum_impl_drop_cast.rs
cenum_impl_drop_cast.stderr
cfguard-run.rs
char.rs
class-cast-to-trait.rs
class-cast-to-trait.stderr
class-method-missing.rs
class-method-missing.stderr
cleanup-rvalue-for-scope.rs
cleanup-rvalue-scopes-cf.rs
cleanup-rvalue-scopes-cf.stderr
cleanup-rvalue-scopes.rs
cleanup-rvalue-temp-during-incomplete-alloc.rs
cleanup-shortcircuit.rs
close-over-big-then-small-data.rs
command-line-diagnostics.rs
command-line-diagnostics.stderr
complex.rs
conservative_impl_trait.rs
conservative_impl_trait.stderr
constructor-lifetime-args.rs
constructor-lifetime-args.stderr
copy-a-resource.rs
copy-a-resource.stderr
crate-leading-sep.rs
crate-method-reexport-grrrrrrr.rs
crate-name-attr-used.rs
crate-name-mismatch.rs
crate-name-mismatch.stderr
custom_attribute.rs
custom_attribute.stderr
custom-attribute-multisegment.rs
custom-attribute-multisegment.stderr
custom-test-frameworks-simple.rs
deduplicate-diagnostics.deduplicate.stderr
deduplicate-diagnostics.duplicate.stderr
deduplicate-diagnostics.rs
deep.rs
default-method-parsing.rs
default-method-simple.rs
defaults-well-formedness.rs
deprecation-in-force-unstable.rs
deref-non-pointer.rs
deref-non-pointer.stderr
deref-rc.rs
deref.rs
derive-uninhabited-enum-38885.rs
derive-uninhabited-enum-38885.stderr
destructure-trait-ref.rs
destructure-trait-ref.stderr
diverging-fallback-method-chain.rs
diverging-fallback-option.rs
diverging-fn-tail-35849.rs
diverging-fn-tail-35849.stderr
double-ref.rs
double-type-import.rs
double-type-import.stderr
dupe-first-attr.rs
duplicate_entry_error.rs
duplicate_entry_error.stderr
duplicate-label-E0381-issue-129274.rs
duplicate-label-E0381-issue-129274.stderr
early-ret-binop-add.rs
elide-errors-on-mismatched-tuple.rs
elide-errors-on-mismatched-tuple.stderr
elided-test.rs
elided-test.stderr
else-if.rs
empty-allocation-non-null.rs
empty-allocation-rvalue-non-null.rs
empty-type-parameter-list.rs
empty-type-parameter-list.stderr
error-festival.rs
error-festival.stderr
error-should-say-copy-not-pod.rs
error-should-say-copy-not-pod.stderr
exclusive-drop-and-copy.rs
exclusive-drop-and-copy.stderr
explain.rs
explain.stdout
explicit-i-suffix.rs
explore-issue-38412.rs
explore-issue-38412.stderr
ext-expand-inner-exprs.rs
ext-nonexistent.rs
ext-nonexistent.stderr
fact.rs
fail-simple.rs
fail-simple.stderr
filter-block-view-items.rs
format-no-std.rs
fun-indirect-call.rs
future-incompatible-lint-group.rs
future-incompatible-lint-group.stderr
global-scope.rs
hello.rs
illegal-ufcs-drop.fixed
illegal-ufcs-drop.rs
illegal-ufcs-drop.stderr
impl-inherent-non-conflict.rs
impl-not-adjacent-to-type.rs
impl-privacy-xc-1.rs
impl-unused-rps-in-assoc-type.rs
impl-unused-rps-in-assoc-type.stderr
impl-unused-tps-inherent.rs
impl-unused-tps-inherent.stderr
impl-unused-tps.rs
impl-unused-tps.stderr
implicit-method-bind.rs
implicit-method-bind.stderr
inline-disallow-on-variant.rs
inline-disallow-on-variant.stderr
inlined-main.rs
inner-attrs-on-impl.rs
inner-module.rs
inner-static-type-parameter.rs
inner-static-type-parameter.stderr
inner-static.rs
integral-indexing.rs
integral-indexing.stderr
integral-variable-unification-error.rs
integral-variable-unification-error.stderr
invalid_crate_type_syntax.rs
invalid_crate_type_syntax.stderr
invalid_dispatch_from_dyn_impls.rs
invalid_dispatch_from_dyn_impls.stderr
issue-11881.rs
issue-13560.rs
issue-15924.rs
issue-16822.rs
issue-18502.rs
issue-24106.rs
issue-76387-llvm-miscompile.rs
issues-71798.rs
issues-71798.stderr
item-name-overload.rs
kinds-in-metadata.rs
kinds-of-primitive-impl.rs
kinds-of-primitive-impl.stderr
last-use-in-block.rs
last-use-in-cap-clause.rs
last-use-is-capture.rs
lazy-and-or.rs
lexical-scopes.rs
lexical-scopes.stderr
lexical-scoping.rs
link-section.rs
list.rs
log-err-phi.rs
log-knows-the-names-of-variants.rs
log-poly.rs
logging-only-prints-once.rs
loud_ui.rs
max-min-classes.rs
maximal_mir_to_hir_coverage.rs
maybe-bounds.rs
maybe-bounds.stderr
method-output-diff-issue-127263.rs
method-output-diff-issue-127263.stderr
minus-string.rs
minus-string.stderr
missing_debug_impls.rs
missing_debug_impls.stderr
mod-subitem-as-enum-variant.rs
mod-subitem-as-enum-variant.stderr
monomorphize-abi-alignment.rs
msvc-data-only.rs
msvc-opt-minsize.rs
multibyte.rs
multiline-comment.rs
mut-function-arguments.rs
mutual-recursion-group.rs
myriad-closures.rs
nested-block-comment.rs
nested-cfg-attrs.rs
nested-cfg-attrs.stderr
nested-class.rs
nested-ty-params.rs
nested-ty-params.stderr
new-impl-syntax.rs
new-import-syntax.rs
new-style-constants.rs
new-unicode-escapes.rs
newlambdas.rs
newtype-polymorphic.rs
newtype.rs
no_crate_type.rs
no_crate_type.stderr
no_send-enum.rs
no_send-enum.stderr
no_send-rc.rs
no_send-rc.stderr
no_share-enum.rs
no_share-enum.stderr
no_share-struct.rs
no_share-struct.stderr
no-capture-arc.rs
no-capture-arc.stderr
no-core-1.rs
no-core-2.rs
no-link-unknown-crate.rs
no-link-unknown-crate.stderr
no-reuse-move-arc.rs
no-reuse-move-arc.stderr
no-send-res-ports.rs
no-send-res-ports.stderr
no-warn-on-field-replace-issue-34101.rs
noexporttypeexe.rs
noexporttypeexe.stderr
non-constant-expr-for-arr-len.rs
non-constant-expr-for-arr-len.stderr
non-copyable-void.rs
non-copyable-void.stderr
non-fmt-panic.fixed
non-fmt-panic.rs
non-fmt-panic.stderr
noncopyable-class.rs
noncopyable-class.stderr
nonscalar-cast.fixed
nonscalar-cast.rs
nonscalar-cast.stderr
not-clone-closure.rs
not-clone-closure.stderr
not-copy-closure.rs
not-copy-closure.stderr
not-enough-arguments.rs
not-enough-arguments.stderr
nul-characters.rs
nullable-pointer-iotareduction.rs
nullable-pointer-size.rs
object-pointer-types.rs
object-pointer-types.stderr
objects-coerce-freeze-borrored.rs
occurs-check-2.rs
occurs-check-2.stderr
occurs-check-3.rs
occurs-check-3.stderr
occurs-check.rs
occurs-check.stderr
once-cant-call-twice-on-heap.rs
once-cant-call-twice-on-heap.stderr
oom_unwind.rs
op-assign-builtins-by-ref.rs
opeq.rs
opt-in-copy.rs
opt-in-copy.stderr
optimization-remark.rs
out-pointer-aliasing.rs
output-slot-variants.rs
over-constrained-vregs.rs
panic_implementation-closures.rs
panic-while-printing.rs
paren-span.rs
paren-span.stderr
partialeq_help.rs
partialeq_help.stderr
path-lookahead.fixed
path-lookahead.rs
path-lookahead.stderr
path.rs
paths-containing-nul.rs
phantom-auto-trait.rs
phantom-auto-trait.stderr
point-to-type-err-cause-on-impl-trait-return-2.rs
point-to-type-err-cause-on-impl-trait-return-2.stderr
pptypedef.rs
pptypedef.stderr
primitive-binop-lhs-mut.rs
print-calling-conventions.rs
print-calling-conventions.stdout
print-stdout-eprint-stderr.rs
project-cache-issue-31849.rs
ptr-coercion-rpass.rs
ptr-coercion.rs
ptr-coercion.stderr
query-visibility.rs
raw-str.rs
README.md
realloc-16687.rs
reassign-ref-mut.rs
reassign-ref-mut.stderr
reexport-test-harness-main.rs
removing-extern-crate.fixed
removing-extern-crate.rs
removing-extern-crate.stderr
resource-assign-is-not-copy.rs
resource-destruct.rs
rustc-error.rs
rustc-error.stderr
seq-args.rs
seq-args.stderr
shadow-bool.rs
shadowed-use-visibility.rs
short-error-format.rs
short-error-format.stderr
simd-abi-checks.rs
simd-abi-checks.stderr
sized-borrowed-pointer.rs
sized-cycle-note.rs
sized-cycle-note.stderr
sized-owned-pointer.rs
sse2.rs
sse-abi-checks.rs
sse-abi-checks.stderr
stable-addr-of.rs
std-uncopyable-atomics.rs
std-uncopyable-atomics.stderr
stdio-is-blocking.rs
string-box-error.rs
struct-ctor-mangling.rs
super-at-top-level.rs
super-at-top-level.stderr
super.rs
svh-add-nothing.rs
swap-1.rs
swap-overlapping.rs
switched-expectations.rs
switched-expectations.stderr
syntax-extension-minor.rs
tag-type-args.rs
tag-type-args.stderr
tag-variant-cast-non-nullary.fixed
tag-variant-cast-non-nullary.rs
tag-variant-cast-non-nullary.stderr
tail-call-arg-leak.rs
tail-cps.rs
tail-typeck.rs
tail-typeck.stderr
trailing-comma.rs
trait-method-number-parameters.rs
trait-method-number-parameters.stderr
transmute-equal-assoc-types.rs
transmute-non-immediate-to-immediate.rs
trivial_casts-rpass.rs
trivial_casts-rpass.stderr
try-from-int-error-partial-eq.rs
try-operator-hygiene.rs
try-operator.rs
tydesc-name.rs
type_length_limit.polonius.stderr
type_length_limit.rs
type_length_limit.stderr
type-id-higher-rank-2.rs
type-namespace.rs
type-param-constraints.rs
type-param.rs
type-ptr.rs
type-use-i1-versus-i8.rs
typeid-intrinsic.rs
typestate-multi-decl.rs
unconstrained-none.rs
unconstrained-none.stderr
unconstrained-ref.rs
unconstrained-ref.stderr
underscore-ident-matcher.rs
underscore-ident-matcher.stderr
underscore-lifetimes.rs
underscore-method-after-integer.rs
unevaluated_fixed_size_array_len.rs
unevaluated_fixed_size_array_len.stderr
uninit-empty-types.rs
unit.rs
unknown-language-item.rs
unknown-language-item.stderr
unknown-llvm-arg.rs
unknown-llvm-arg.stderr
unnamed_argument_mode.rs
unreachable-code-1.rs
unreachable-code.rs
unsigned-literal-negation.rs
unsigned-literal-negation.stderr
unused-move-capture.rs
unused-move.rs
unwind-no-uwtable.rs
use-import-export.rs
use-keyword-2.rs
use-module-level-int-consts.rs
use-nested-groups.rs
used.rs
used.stderr
usize-generic-argument-parent.rs
usize-generic-argument-parent.stderr
utf8_idents.rs
utf8-bom.rs
wait-forked-but-failed-child.rs
walk-struct-literal-with.rs
walk-struct-literal-with.stderr
weak-new-uninhabited-issue-48493.rs
weird-exit-code.rs
weird-exprs.rs
write-fmt-errors.rs
writing-to-immutable-vec.rs
writing-to-immutable-vec.stderr
wrong-hashset-issue-42918.rs

README.md

UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.

As part of an on-going effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.