134 lines
5.2 KiB
Rust
134 lines
5.2 KiB
Rust
// This crate attempts to enumerate the various scenarios for how a
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// type can define fields and methods with various visibilities and
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// stabilities.
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//
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// The basic stability pattern in this file has four cases:
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// 1. no stability attribute at all
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// 2. a stable attribute (feature "unit_test")
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// 3. an unstable attribute that unit test declares (feature "unstable_declared")
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// 4. an unstable attribute that unit test fails to declare (feature "unstable_undeclared")
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//
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// This file also covers four kinds of visibility: private,
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// pub(module), pub(crate), and pub.
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//
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// However, since stability attributes can only be observed in
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// cross-crate linkage scenarios, there is little reason to take the
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// cross-product (4 stability cases * 4 visibility cases), because the
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// first three visibility cases cannot be accessed outside this crate,
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// and therefore stability is only relevant when the visibility is pub
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// to the whole universe.
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//
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// (The only reason to do so would be if one were worried about the
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// compiler having some subtle bug where adding a stability attribute
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// introduces a privacy violation. As a way to provide evidence that
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// this is not occurring, I have put stability attributes on some
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// non-pub fields, marked with SILLY below)
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#![feature(staged_api)]
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#![stable(feature = "unit_test", since = "1.0.0")]
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub use m::{Record, Trait, Tuple};
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mod m {
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#[derive(Default)]
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub struct Record {
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub a_stable_pub: i32,
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#[unstable(feature = "unstable_declared", issue = "38412")]
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pub a_unstable_declared_pub: i32,
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#[unstable(feature = "unstable_undeclared", issue = "38412")]
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pub a_unstable_undeclared_pub: i32,
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#[unstable(feature = "unstable_undeclared", issue = "38412")] // SILLY
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pub(crate) b_crate: i32,
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#[unstable(feature = "unstable_declared", issue = "38412")] // SILLY
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pub(in m) c_mod: i32,
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#[stable(feature = "unit_test", since = "1.0.0")] // SILLY
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d_priv: i32
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}
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#[derive(Default)]
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub struct Tuple(
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub i32,
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#[unstable(feature = "unstable_declared", issue = "38412")]
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pub i32,
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#[unstable(feature = "unstable_undeclared", issue = "38412")]
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pub i32,
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pub(crate) i32,
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pub(in m) i32,
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i32);
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impl Record {
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub fn new() -> Self { Default::default() }
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}
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impl Tuple {
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub fn new() -> Self { Default::default() }
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}
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub trait Trait {
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#[stable(feature = "unit_test", since = "1.0.0")]
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type Type;
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#[stable(feature = "unit_test", since = "1.0.0")]
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fn stable_trait_method(&self) -> Self::Type;
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#[unstable(feature = "unstable_undeclared", issue = "38412")]
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fn unstable_undeclared_trait_method(&self) -> Self::Type;
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#[unstable(feature = "unstable_declared", issue = "38412")]
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fn unstable_declared_trait_method(&self) -> Self::Type;
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}
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#[stable(feature = "unit_test", since = "1.0.0")]
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impl Trait for Record {
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type Type = i32;
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fn stable_trait_method(&self) -> i32 { self.d_priv }
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fn unstable_undeclared_trait_method(&self) -> i32 { self.d_priv }
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fn unstable_declared_trait_method(&self) -> i32 { self.d_priv }
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}
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#[stable(feature = "unit_test", since = "1.0.0")]
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impl Trait for Tuple {
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type Type = i32;
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fn stable_trait_method(&self) -> i32 { self.3 }
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fn unstable_undeclared_trait_method(&self) -> i32 { self.3 }
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fn unstable_declared_trait_method(&self) -> i32 { self.3 }
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}
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impl Record {
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#[unstable(feature = "unstable_undeclared", issue = "38412")]
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pub fn unstable_undeclared(&self) -> i32 { self.d_priv }
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#[unstable(feature = "unstable_declared", issue = "38412")]
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pub fn unstable_declared(&self) -> i32 { self.d_priv }
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub fn stable(&self) -> i32 { self.d_priv }
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#[unstable(feature = "unstable_undeclared", issue = "38412")] // SILLY
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pub(crate) fn pub_crate(&self) -> i32 { self.d_priv }
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#[unstable(feature = "unstable_declared", issue = "38412")] // SILLY
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pub(in m) fn pub_mod(&self) -> i32 { self.d_priv }
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#[stable(feature = "unit_test", since = "1.0.0")] // SILLY
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fn private(&self) -> i32 { self.d_priv }
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}
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impl Tuple {
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#[unstable(feature = "unstable_undeclared", issue = "38412")]
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pub fn unstable_undeclared(&self) -> i32 { self.0 }
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#[unstable(feature = "unstable_declared", issue = "38412")]
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pub fn unstable_declared(&self) -> i32 { self.0 }
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#[stable(feature = "unit_test", since = "1.0.0")]
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pub fn stable(&self) -> i32 { self.0 }
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pub(crate) fn pub_crate(&self) -> i32 { self.0 }
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pub(in m) fn pub_mod(&self) -> i32 { self.0 }
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fn private(&self) -> i32 { self.0 }
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}
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}
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