Auto merge of rust-lang#102192 - matthiaskrgr:rollup-0ctjzco, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#102094 (Add missing documentation for `bool::from_str`)
 - rust-lang#102115 (Add examples to `bool::then` and `bool::then_some`)
 - rust-lang#102134 (Detect panic strategy using `rustc --print cfg`)
 - rust-lang#102137 (Don't convert valtree to constvalue during normalization)
 - rust-lang#102148 (add regression test for miri issue 2433)
 - rust-lang#102158 (rustdoc: clean up CSS/DOM for deprecation warnings)
 - rust-lang#102177 (Fix a typo in `std`'s root docs)

Failed merges:

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

Author: bors

cargo-miri/src/main.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(bootstrap, feature(let_else))]
 #![allow(clippy::useless_format, clippy::derive_partial_eq_without_eq, rustc::internal)]
 
 #[macro_use]

src/lib.rs

@@ -10,6 +10,7 @@
 #![feature(is_some_with)]
 #![feature(nonzero_ops)]
 #![feature(local_key_cell_methods)]
+#![cfg_attr(bootstrap, feature(let_else))]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,

tests/pass/issues/issue-miri-2433.rs

@@ -0,0 +1,22 @@
+#![feature(type_alias_impl_trait)]
+
+trait T { type Item; }
+
+type Alias<'a> = impl T<Item = &'a ()>;
+
+struct S;
+impl<'a> T for &'a S {
+    type Item = &'a ();
+}
+
+fn filter_positive<'a>() -> Alias<'a> {
+    &S
+}
+
+fn with_positive(fun: impl Fn(Alias<'_>)) {
+    fun(filter_positive());
+}
+
+fn main() {
+    with_positive(|_| ());
+}