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Stabilize Self and associated types in struct expressions and patterns #39282

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Jan 27, 2017
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Stabilize Self and associated types in struct expressions and patterns #39282

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10 changes: 0 additions & 10 deletions src/librustc_typeck/check/mod.rs
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Expand Up @@ -3328,16 +3328,6 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
}
Def::Struct(..) | Def::Union(..) | Def::TyAlias(..) |
Def::AssociatedTy(..) | Def::SelfTy(..) => {
match def {
Def::AssociatedTy(..) | Def::SelfTy(..)
if !self.tcx.sess.features.borrow().more_struct_aliases => {
emit_feature_err(&self.tcx.sess.parse_sess,
"more_struct_aliases", path_span, GateIssue::Language,
"`Self` and associated types in struct \
expressions and patterns are unstable");
}
_ => {}
}
match ty.sty {
ty::TyAdt(adt, substs) if !adt.is_enum() => {
Some((adt.struct_variant(), adt.did, substs))
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6 changes: 2 additions & 4 deletions src/libsyntax/feature_gate.rs
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Expand Up @@ -295,10 +295,6 @@ declare_features! (
// The #![windows_subsystem] attribute
(active, windows_subsystem, "1.14.0", Some(37499)),

// Allows using `Self` and associated types in struct expressions and patterns.
(active, more_struct_aliases, "1.14.0", Some(37544)),


// Allows #[link(..., cfg(..))]
(active, link_cfg, "1.14.0", Some(37406)),

Expand Down Expand Up @@ -378,6 +374,8 @@ declare_features! (
// Allows `..` in tuple (struct) patterns
(accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627)),
(accepted, item_like_imports, "1.14.0", Some(35120)),
// Allows using `Self` and associated types in struct expressions and patterns.
(accepted, more_struct_aliases, "1.14.0", Some(37544)),
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Great feature! does this version need to be updated (Should be 1.16, right)?

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I don't know.
For active features it's the version in which it was implemented. What does this version mean exactly for accepted and removed features, something else?
I never cared to update it previously.

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I see, let's see if anyone can say if there's a reason to update it. For library features it's neat to see it in the docs, I guess here it doesn't actually show anywhere?

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What does this version mean exactly for accepted and removed features, something else?

Note the comment above the first declare_features! block: "The version numbers here correspond to the version in which the current status was set."

I guess here it doesn't actually show anywhere?

It is at least displayed in the message of the lint for #[feature]-gate attributes for already-stable features.

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PR: #39552

);
// (changing above list without updating src/doc/reference.md makes @cmr sad)

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2 changes: 0 additions & 2 deletions src/test/compile-fail/struct-path-associated-type.rs
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Expand Up @@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(more_struct_aliases)]

struct S;

trait Tr {
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31 changes: 0 additions & 31 deletions src/test/compile-fail/struct-path-self-feature-gate.rs
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This file was deleted.

2 changes: 0 additions & 2 deletions src/test/compile-fail/struct-path-self-type-mismatch.rs
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Expand Up @@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(more_struct_aliases)]

struct Foo<A> { inner: A }

trait Bar { fn bar(); }
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2 changes: 0 additions & 2 deletions src/test/compile-fail/struct-path-self.rs
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Expand Up @@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(more_struct_aliases)]

struct S;

trait Tr {
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2 changes: 0 additions & 2 deletions src/test/run-pass/struct-path-associated-type.rs
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Expand Up @@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(more_struct_aliases)]

struct S<T, U = u16> {
a: T,
b: U,
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2 changes: 0 additions & 2 deletions src/test/run-pass/struct-path-self.rs
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Expand Up @@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(more_struct_aliases)]

use std::ops::Add;

struct S<T, U = u16> {
Expand Down