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Rollup merge of #97720 - cjgillot:all-fresh, r=petrochenkov
Always create elided lifetime parameters for functions Anonymous and elided lifetimes in functions are sometimes (async fns) --and sometimes not (regular fns)-- desugared to implicit generic parameters. This difference of treatment makes it some downstream analyses more complicated to handle. This step is a pre-requisite to perform lifetime elision resolution on AST. There is currently an inconsistency in the treatment of argument-position impl-trait for functions and async fns: ```rust trait Foo<'a> {} fn foo(t: impl Foo<'_>) {} //~ ERROR missing lifetime specifier async fn async_foo(t: impl Foo<'_>) {} //~ OK fn bar(t: impl Iterator<Item = &'_ u8>) {} //~ ERROR missing lifetime specifier async fn async_bar(t: impl Iterator<Item = &'_ u8>) {} //~ OK ``` The current implementation reports "missing lifetime specifier" on `foo`, but **accepts it** in `async_foo`. This PR **proposes to accept** the anonymous lifetime in both cases as an extra generic lifetime parameter. This change would be insta-stable, so let's ping t-lang. Anonymous lifetimes in GAT bindings keep being forbidden: ```rust fn foo(t: impl Foo<Assoc<'_> = Bar<'_>>) {} ^^ ^^ forbidden ok ``` I started a discussion here: https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/Anonymous.20lifetimes.20in.20universal.20impl-trait/near/284968606 r? ``@petrochenkov``
This commit is contained in:
commit
f5e9cb53ab
@ -148,6 +148,8 @@ declare_features! (
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/// below (it has to be checked before expansion possibly makes
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/// macros disappear).
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(active, allow_internal_unstable, "1.0.0", None, None),
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/// Allows using anonymous lifetimes in argument-position impl-trait.
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(active, anonymous_lifetime_in_impl_trait, "1.63.0", None, None),
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/// Allows identifying the `compiler_builtins` crate.
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(active, compiler_builtins, "1.13.0", None, None),
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/// Outputs useful `assert!` messages
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|
@ -758,7 +758,10 @@ impl<'a: 'ast, 'ast> Visitor<'ast> for LateResolutionVisitor<'a, '_, 'ast> {
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// We don't need to deal with patterns in parameters, because
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// they are not possible for foreign or bodiless functions.
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self.with_lifetime_rib(
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LifetimeRibKind::AnonymousPassThrough(fn_id, false),
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LifetimeRibKind::AnonymousCreateParameter {
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binder: fn_id,
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report_in_path: false,
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},
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|this| walk_list!(this, visit_param, &sig.decl.inputs),
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);
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self.with_lifetime_rib(
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@ -792,18 +795,13 @@ impl<'a: 'ast, 'ast> Visitor<'ast> for LateResolutionVisitor<'a, '_, 'ast> {
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// generic parameters. This is especially useful for `async fn`, where
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// these fresh generic parameters can be applied to the opaque `impl Trait`
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// return type.
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let rib = if async_node_id.is_some() {
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// Only emit a hard error for `async fn`, since this kind of
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// elision has always been allowed in regular `fn`s.
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this.with_lifetime_rib(
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LifetimeRibKind::AnonymousCreateParameter {
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binder: fn_id,
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report_in_path: true,
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}
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} else {
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LifetimeRibKind::AnonymousPassThrough(fn_id, false)
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};
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this.with_lifetime_rib(
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rib,
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// Only emit a hard error for `async fn`, since this kind of
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// elision has always been allowed in regular `fn`s.
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report_in_path: async_node_id.is_some(),
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},
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// Add each argument to the rib.
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|this| this.resolve_params(&declaration.inputs),
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);
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|
@ -1677,7 +1677,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
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break None;
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}
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Scope::Binder { ref lifetimes, scope_type, s, .. } => {
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Scope::Binder { ref lifetimes, scope_type, s, where_bound_origin, .. } => {
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if let Some(&def) = lifetimes.get(®ion_def_id) {
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break Some(def.shifted(late_depth));
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}
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@ -1685,6 +1685,21 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
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BinderScopeType::Normal => late_depth += 1,
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BinderScopeType::Concatenating => {}
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}
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// Fresh lifetimes in APIT used to be allowed in async fns and forbidden in
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// regular fns.
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if let Some(hir::PredicateOrigin::ImplTrait) = where_bound_origin
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&& let hir::LifetimeName::Param(_, hir::ParamName::Fresh) = lifetime_ref.name
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&& let hir::IsAsync::NotAsync = self.tcx.asyncness(lifetime_ref.hir_id.owner)
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&& !self.tcx.features().anonymous_lifetime_in_impl_trait
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{
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rustc_session::parse::feature_err(
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&self.tcx.sess.parse_sess,
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sym::anonymous_lifetime_in_impl_trait,
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lifetime_ref.span,
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"anonymous lifetimes in `impl Trait` are unstable",
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).emit();
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return;
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}
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scope = s;
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}
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|
@ -341,6 +341,7 @@ symbols! {
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always,
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and,
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and_then,
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anonymous_lifetime_in_impl_trait,
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any,
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append_const_msg,
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arbitrary_enum_discriminant,
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|
@ -93,7 +93,7 @@ impl CustomStruct {
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fn test_alias(
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value: CustomAlias,
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reference: &CustomAlias, //~ ERROR passing `CustomAlias<>` by reference
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reference: &CustomAlias, //~ ERROR passing `CustomAlias<'_>` by reference
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) {
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}
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}
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|
@ -94,11 +94,11 @@ error: passing `CustomStruct` by reference
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LL | reference: &CustomStruct,
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| ^^^^^^^^^^^^^ help: try passing by value: `CustomStruct`
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error: passing `CustomAlias<>` by reference
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error: passing `CustomAlias<'_>` by reference
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--> $DIR/rustc_pass_by_value.rs:96:20
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|
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LL | reference: &CustomAlias,
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| ^^^^^^^^^^^^ help: try passing by value: `CustomAlias<>`
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| ^^^^^^^^^^^^ help: try passing by value: `CustomAlias<'_>`
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error: passing `WithParameters<T, 1>` by reference
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--> $DIR/rustc_pass_by_value.rs:110:20
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|
@ -4,12 +4,12 @@ error[E0478]: lifetime bound not satisfied
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LL | fn do_sth(_: u32) {}
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| ^^^^^^^^^^^^^^^^^
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|
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note: lifetime parameter instantiated with the anonymous lifetime #2 defined here
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note: lifetime parameter instantiated with the anonymous lifetime as defined here
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--> $DIR/issue-87748.rs:18:5
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|
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LL | fn do_sth(_: u32) {}
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| ^^^^^^^^^^^^^^^^^
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note: but lifetime parameter must outlive the anonymous lifetime #1 defined here
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note: but lifetime parameter must outlive the anonymous lifetime as defined here
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--> $DIR/issue-87748.rs:18:5
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|
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LL | fn do_sth(_: u32) {}
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|
@ -3,7 +3,7 @@
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// at some point in the future.
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#![feature(generic_associated_types)]
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#![feature(anonymous_lifetime_in_impl_trait)]
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trait Foo {
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type Item<'a>;
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}
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@ -11,7 +11,10 @@ trait Foo {
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fn foo(x: &impl Foo<Item<'_> = u32>) { }
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//~^ ERROR `'_` cannot be used here [E0637]
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// Ok: the anonymous lifetime is bound to the function.
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fn bar(x: &impl for<'a> Foo<Item<'a> = &'_ u32>) { }
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//~^ ERROR missing lifetime specifier
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// Ok: the anonymous lifetime is bound to the function.
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fn baz(x: &impl for<'a> Foo<Item<'a> = &u32>) { }
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fn main() {}
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|
@ -4,18 +4,6 @@ error[E0637]: `'_` cannot be used here
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LL | fn foo(x: &impl Foo<Item<'_> = u32>) { }
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| ^^ `'_` is a reserved lifetime name
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error[E0106]: missing lifetime specifier
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--> $DIR/issue-95305.rs:14:41
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|
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LL | fn bar(x: &impl for<'a> Foo<Item<'a> = &'_ u32>) { }
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| ^^ expected named lifetime parameter
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|
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help: consider using the `'a` lifetime
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|
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LL | fn bar(x: &impl for<'a> Foo<Item<'a> = &'a u32>) { }
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| ~~
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error: aborting due to previous error
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0106, E0637.
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For more information about an error, try `rustc --explain E0106`.
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For more information about this error, try `rustc --explain E0637`.
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|
@ -6,7 +6,7 @@ LL | fn next(&'a mut self) -> Option<Self::Item>
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|
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= note: expected fn pointer `fn(&mut RepeatMut<'a, T>) -> Option<_>`
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found fn pointer `fn(&'a mut RepeatMut<'a, T>) -> Option<_>`
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note: the anonymous lifetime #1 defined here...
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note: the anonymous lifetime as defined here...
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--> $DIR/issue-37884.rs:6:5
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|
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LL | fn next(&'a mut self) -> Option<Self::Item>
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|
@ -2,14 +2,14 @@ error[E0700]: hidden type for `impl Trait` captures lifetime that does not appea
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--> $DIR/impl-trait-captures.rs:11:5
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|
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LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> {
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| -- hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0)) T` captures the anonymous lifetime defined here
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| -- hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_)) T` captures the anonymous lifetime defined here
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LL | x
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| ^
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|
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help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0))` lifetime bound
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help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_))` lifetime bound
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|
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LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0)) {
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| ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrNamed(DefId(0:13 ~ impl_trait_captures[1afc]::foo::'_), '_)) {
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| ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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error: aborting due to previous error
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|
21
src/test/ui/suggestions/impl-trait-missing-lifetime-gated.rs
Normal file
21
src/test/ui/suggestions/impl-trait-missing-lifetime-gated.rs
Normal file
@ -0,0 +1,21 @@
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// edition:2021
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// gate-test-anonymous_lifetime_in_impl_trait
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// Verify the behaviour of `feature(anonymous_lifetime_in_impl_trait)`.
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fn f(_: impl Iterator<Item = &'_ ()>) {}
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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//~| ERROR missing lifetime specifier
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// Anonymous lifetimes in async fn are already allowed.
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// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
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async fn h(_: impl Iterator<Item = &'_ ()>) {}
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|
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// Anonymous lifetimes in async fn are already allowed.
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// But that lifetime does not participate in resolution.
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async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
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//~^ ERROR missing lifetime specifier
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fn main() {}
|
@ -0,0 +1,44 @@
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error[E0658]: anonymous lifetimes in `impl Trait` are unstable
|
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--> $DIR/impl-trait-missing-lifetime-gated.rs:5:31
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|
|
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LL | fn f(_: impl Iterator<Item = &'_ ()>) {}
|
||||
| ^^
|
||||
|
|
||||
= help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
|
||||
|
||||
error[E0106]: missing lifetime specifier
|
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--> $DIR/impl-trait-missing-lifetime-gated.rs:8:50
|
||||
|
|
||||
LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
| ^^ expected named lifetime parameter
|
||||
|
|
||||
= help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
|
||||
help: consider using the `'static` lifetime
|
||||
|
|
||||
LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
|
||||
| ~~~~~~~
|
||||
|
||||
error[E0658]: anonymous lifetimes in `impl Trait` are unstable
|
||||
--> $DIR/impl-trait-missing-lifetime-gated.rs:8:31
|
||||
|
|
||||
LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
| ^^
|
||||
|
|
||||
= help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
|
||||
|
||||
error[E0106]: missing lifetime specifier
|
||||
--> $DIR/impl-trait-missing-lifetime-gated.rs:18:56
|
||||
|
|
||||
LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
| ^^ expected named lifetime parameter
|
||||
|
|
||||
= help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
|
||||
help: consider using the `'static` lifetime
|
||||
|
|
||||
LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
|
||||
| ~~~~~~~
|
||||
|
||||
error: aborting due to 4 previous errors
|
||||
|
||||
Some errors have detailed explanations: E0106, E0658.
|
||||
For more information about an error, try `rustc --explain E0106`.
|
@ -1,2 +1,19 @@
|
||||
fn f(_: impl Iterator<Item = &'_ ()>) {} //~ ERROR missing lifetime specifier
|
||||
// edition:2021
|
||||
|
||||
#![feature(anonymous_lifetime_in_impl_trait)]
|
||||
|
||||
// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
|
||||
fn f(_: impl Iterator<Item = &'_ ()>) {}
|
||||
|
||||
// But that lifetime does not participate in resolution.
|
||||
fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
//~^ ERROR missing lifetime specifier
|
||||
|
||||
// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
|
||||
async fn h(_: impl Iterator<Item = &'_ ()>) {}
|
||||
|
||||
// But that lifetime does not participate in resolution.
|
||||
async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
//~^ ERROR missing lifetime specifier
|
||||
|
||||
fn main() {}
|
||||
|
@ -1,14 +1,27 @@
|
||||
error[E0106]: missing lifetime specifier
|
||||
--> $DIR/impl-trait-missing-lifetime.rs:1:31
|
||||
--> $DIR/impl-trait-missing-lifetime.rs:9:50
|
||||
|
|
||||
LL | fn f(_: impl Iterator<Item = &'_ ()>) {}
|
||||
| ^^ expected named lifetime parameter
|
||||
LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
| ^^ expected named lifetime parameter
|
||||
|
|
||||
help: consider introducing a named lifetime parameter
|
||||
= help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
|
||||
help: consider using the `'static` lifetime
|
||||
|
|
||||
LL | fn f<'a>(_: impl Iterator<Item = &'a ()>) {}
|
||||
| ++++ ~~
|
||||
LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
|
||||
| ~~~~~~~
|
||||
|
||||
error: aborting due to previous error
|
||||
error[E0106]: missing lifetime specifier
|
||||
--> $DIR/impl-trait-missing-lifetime.rs:16:56
|
||||
|
|
||||
LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
|
||||
| ^^ expected named lifetime parameter
|
||||
|
|
||||
= help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
|
||||
help: consider using the `'static` lifetime
|
||||
|
|
||||
LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
|
||||
| ~~~~~~~
|
||||
|
||||
error: aborting due to 2 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0106`.
|
||||
|
@ -21,11 +21,11 @@ note: because this has an unmet lifetime requirement
|
||||
|
|
||||
LL | pub struct Wrapper<T: Trait>(T);
|
||||
| ^^^^^ introduces a `'static` lifetime requirement
|
||||
note: the anonymous lifetime #1 defined here...
|
||||
--> $DIR/wf-in-foreign-fn-decls-issue-80468.rs:16:5
|
||||
note: the anonymous lifetime as defined here...
|
||||
--> $DIR/wf-in-foreign-fn-decls-issue-80468.rs:16:29
|
||||
|
|
||||
LL | pub fn repro(_: Wrapper<Ref>);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
| ^^^
|
||||
note: ...does not necessarily outlive the static lifetime introduced by the compatible `impl`
|
||||
--> $DIR/wf-in-foreign-fn-decls-issue-80468.rs:13:1
|
||||
|
|
||||
|
@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_help;
|
||||
use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
|
||||
use clippy_utils::{get_trait_def_id, paths, return_ty, trait_ref_of_method};
|
||||
use if_chain::if_chain;
|
||||
use rustc_hir::{ImplItem, ImplItemKind};
|
||||
use rustc_hir::{GenericParamKind, ImplItem, ImplItemKind};
|
||||
use rustc_lint::{LateContext, LateLintPass};
|
||||
use rustc_session::{declare_lint_pass, declare_tool_lint};
|
||||
use rustc_span::sym;
|
||||
@ -102,7 +102,7 @@ impl<'tcx> LateLintPass<'tcx> for InherentToString {
|
||||
let decl = &signature.decl;
|
||||
if decl.implicit_self.has_implicit_self();
|
||||
if decl.inputs.len() == 1;
|
||||
if impl_item.generics.params.is_empty();
|
||||
if impl_item.generics.params.iter().all(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }));
|
||||
|
||||
// Check if return type is String
|
||||
if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::String);
|
||||
|
@ -9,8 +9,8 @@ use rustc_hir::intravisit::{
|
||||
use rustc_hir::FnRetTy::Return;
|
||||
use rustc_hir::{
|
||||
BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, Impl, ImplItem,
|
||||
ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, PredicateOrigin,
|
||||
TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
|
||||
ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, LifetimeParamKind, ParamName, PolyTraitRef,
|
||||
PredicateOrigin, TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
|
||||
};
|
||||
use rustc_lint::{LateContext, LateLintPass};
|
||||
use rustc_middle::hir::nested_filter as middle_nested_filter;
|
||||
@ -338,7 +338,10 @@ fn could_use_elision<'tcx>(
|
||||
fn allowed_lts_from(named_generics: &[GenericParam<'_>]) -> FxHashSet<RefLt> {
|
||||
let mut allowed_lts = FxHashSet::default();
|
||||
for par in named_generics.iter() {
|
||||
if let GenericParamKind::Lifetime { .. } = par.kind {
|
||||
if let GenericParamKind::Lifetime {
|
||||
kind: LifetimeParamKind::Explicit,
|
||||
} = par.kind
|
||||
{
|
||||
allowed_lts.insert(RefLt::Named(par.name.ident().name));
|
||||
}
|
||||
}
|
||||
@ -379,6 +382,7 @@ impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
|
||||
self.lts.push(RefLt::Static);
|
||||
} else if let LifetimeName::Param(_, ParamName::Fresh) = lt.name {
|
||||
// Fresh lifetimes generated should be ignored.
|
||||
self.lts.push(RefLt::Unnamed);
|
||||
} else if lt.is_elided() {
|
||||
self.lts.push(RefLt::Unnamed);
|
||||
} else {
|
||||
|
@ -495,12 +495,13 @@ fn check_mut_from_ref<'tcx>(cx: &LateContext<'tcx>, sig: &FnSig<'_>, body: Optio
|
||||
if let FnRetTy::Return(ty) = sig.decl.output
|
||||
&& let Some((out, Mutability::Mut, _)) = get_rptr_lm(ty)
|
||||
{
|
||||
let out_region = cx.tcx.named_region(out.hir_id);
|
||||
let args: Option<Vec<_>> = sig
|
||||
.decl
|
||||
.inputs
|
||||
.iter()
|
||||
.filter_map(get_rptr_lm)
|
||||
.filter(|&(lt, _, _)| lt.name == out.name)
|
||||
.filter(|&(lt, _, _)| cx.tcx.named_region(lt.hir_id) == out_region)
|
||||
.map(|(_, mutability, span)| (mutability == Mutability::Not).then(|| span))
|
||||
.collect();
|
||||
if let Some(args) = args
|
||||
|
@ -31,7 +31,7 @@ pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, lt: &Lifetime, m
|
||||
return false;
|
||||
}
|
||||
|
||||
let ltopt = if lt.is_elided() {
|
||||
let ltopt = if lt.name.is_anonymous() {
|
||||
String::new()
|
||||
} else {
|
||||
format!("{} ", lt.name.ident().as_str())
|
||||
|
Loading…
Reference in New Issue
Block a user