Auto merge of rust-lang#111017 - matthiaskrgr:rollup-yy9updi, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#110118 (download-rustc: Give a better error message if artifacts can't be dowloaded)
 - rust-lang#110631 (rustdoc: catch and don't blow up on impl Trait cycles)
 - rust-lang#110732 (Make ConstProp some tests unit.)
 - rust-lang#110996 (bootstrap: Fix compile error: unused-mut)
 - rust-lang#110999 (Output some bootstrap messages on stderr)
 - rust-lang#111000 (Remove unneeded function call in `core::option`.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

core/src/option.rs

@@ -1007,7 +1007,7 @@ impl<T> Option<T> {
     {
         match self {
             Some(x) => x,
-            None => Default::default(),
+            None => T::default(),
         }
     }
 
@@ -1615,11 +1615,7 @@ impl<T> Option<T> {
     where
         T: Default,
     {
-        fn default<T: Default>() -> T {
-            T::default()
-        }
-
-        self.get_or_insert_with(default)
+        self.get_or_insert_with(T::default)
     }
 
     /// Inserts a value computed from `f` into the option if it is [`None`],