Rollup merge of rust-lang#55828 - oli-obk:promotion_strikes_again, r=eddyb

Add missing `rustc_promotable` attribute to unsigned `min_value` and `max_value`

cc @pnkfelix

fixes rust-lang#55806

Author: pietroalbini

src/libcore/num/mod.rs

@@ -2152,6 +2152,7 @@ Basic usage:
 ", $Feature, "assert_eq!(", stringify!($SelfT), "::min_value(), 0);", $EndFeature, "
 ```"),
             #[stable(feature = "rust1", since = "1.0.0")]
+            #[rustc_promotable]
             #[inline]
             pub const fn min_value() -> Self { 0 }
         }
@@ -2168,6 +2169,7 @@ Basic usage:
 stringify!($MaxV), ");", $EndFeature, "
 ```"),
             #[stable(feature = "rust1", since = "1.0.0")]
+            #[rustc_promotable]
             #[inline]
             pub const fn max_value() -> Self { !0 }
         }

src/test/ui/consts/auxiliary/promotable_const_fn_lib.rs

@@ -0,0 +1,31 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Crate that exports a const fn. Used for testing cross-crate.
+
+#![feature(staged_api, rustc_attrs)]
+#![stable(since="1.0.0", feature = "mep")]
+
+#![crate_type="rlib"]
+
+#[rustc_promotable]
+#[stable(since="1.0.0", feature = "mep")]
+#[inline]
+pub const fn foo() -> usize { 22 }
+
+#[stable(since="1.0.0", feature = "mep")]
+pub struct Foo(usize);
+
+impl Foo {
+    #[stable(since="1.0.0", feature = "mep")]
+    #[inline]
+    #[rustc_promotable]
+    pub const fn foo() -> usize { 22 }
+}

src/test/ui/consts/promote_fn_calls.rs

@@ -0,0 +1,13 @@
+// compile-pass
+// aux-build:promotable_const_fn_lib.rs
+
+#![feature(nll)]
+
+extern crate promotable_const_fn_lib;
+
+use promotable_const_fn_lib::{foo, Foo};
+
+fn main() {
+    let x: &'static usize = &foo();
+    let x: &'static usize = &Foo::foo();
+}

src/test/ui/consts/promote_fn_calls_std.rs

@@ -0,0 +1,30 @@
+// compile-pass
+
+#![feature(nll)]
+
+fn main() {
+    let x: &'static u8 = &u8::max_value();
+    let x: &'static u16 = &u16::max_value();
+    let x: &'static u32 = &u32::max_value();
+    let x: &'static u64 = &u64::max_value();
+    let x: &'static u128 = &u128::max_value();
+    let x: &'static usize = &usize::max_value();
+    let x: &'static u8 = &u8::min_value();
+    let x: &'static u16 = &u16::min_value();
+    let x: &'static u32 = &u32::min_value();
+    let x: &'static u64 = &u64::min_value();
+    let x: &'static u128 = &u128::min_value();
+    let x: &'static usize = &usize::min_value();
+    let x: &'static i8 = &i8::max_value();
+    let x: &'static i16 = &i16::max_value();
+    let x: &'static i32 = &i32::max_value();
+    let x: &'static i64 = &i64::max_value();
+    let x: &'static i128 = &i128::max_value();
+    let x: &'static isize = &isize::max_value();
+    let x: &'static i8 = &i8::min_value();
+    let x: &'static i16 = &i16::min_value();
+    let x: &'static i32 = &i32::min_value();
+    let x: &'static i64 = &i64::min_value();
+    let x: &'static i128 = &i128::min_value();
+    let x: &'static isize = &isize::min_value();
+}