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Rollup merge of #79548 - CraftSpider:76998, r=jyn514

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Show since when a function is const in stdlib

Fixes #76998

This makes it so that functions with the `#[rustc_const_stable()]` attribute now show from what version they were stably declared const, alongside what version they were declared stable. Example from `Result`:
![image](https://user-images.githubusercontent.com/13342132/100561194-1be60d00-3286-11eb-99ff-1e81201218a9.png)

r? ``@jyn514``
This commit is contained in:
Mara Bos 2020-12-01 10:50:21 +00:00 • committed by GitHub
commit 33d7b8c65c
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7 changed files with 99 additions and 18 deletions
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10
src/test/rustdoc/const-display.rs
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@ -1,3 +1,5 @@
// ignore-tidy-linelength
#![crate_name = "foo"]
#![unstable(feature = "humans",
@ -17,6 +19,7 @@ pub const unsafe fn foo() -> u32 { 42 }
pub const fn foo2() -> u32 { 42 }
// @has 'foo/fn.bar2.html' '//pre' 'pub const fn bar2() -> u32'
// @has - //span '1.0.0 (const: 1.0.0)'
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
pub const fn bar2() -> u32 { 42 }
@ -26,6 +29,7 @@ pub const fn bar2() -> u32 { 42 }
pub const unsafe fn foo2_gated() -> u32 { 42 }
// @has 'foo/fn.bar2_gated.html' '//pre' 'pub const unsafe fn bar2_gated() -> u32'
// @has - '//span[@class="since"]' '1.0.0 (const: 1.0.0)'
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
pub const unsafe fn bar2_gated() -> u32 { 42 }
@ -40,4 +44,10 @@ impl Foo {
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature="foo", issue = "none")]
pub const unsafe fn gated() -> u32 { 42 }
// @has 'foo/struct.Foo.html' '//h4[@id="method.stable_impl"]/code' 'pub const fn stable_impl() -> u32'
// @has - '//span[@class="since"]' '1.0.0 (const: 1.2.0)'
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rust1", since = "1.2.0")]
pub const fn stable_impl() -> u32 { 42 }
}