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Auto merge of rust-lang#96094 - Elliot-Roberts:fix_doctests, r=compiler-errors
Begin fixing all the broken doctests in `compiler/` Begins to fix rust-lang#95994. All of them pass now but 24 of them I've marked with `ignore HELP (<explanation>)` (asking for help) as I'm unsure how to get them to work / if we should leave them as they are. There are also a few that I marked `ignore` that could maybe be made to work but seem less important. Each `ignore` has a rough "reason" for ignoring after it parentheses, with - `(pseudo-rust)` meaning "mostly rust-like but contains foreign syntax" - `(illustrative)` a somewhat catchall for either a fragment of rust that doesn't stand on its own (like a lone type), or abbreviated rust with ellipses and undeclared types that would get too cluttered if made compile-worthy. - `(not-rust)` stuff that isn't rust but benefits from the syntax highlighting, like MIR. - `(internal)` uses `rustc_*` code which would be difficult to make work with the testing setup. Those reason notes are a bit inconsistently applied and messy though. If that's important I can go through them again and try a more principled approach. When I run `rg '```ignore \(' .` on the repo, there look to be lots of different conventions other people have used for this sort of thing. I could try unifying them all if that would be helpful. I'm not sure if there was a better existing way to do this but I wrote my own script to help me run all the doctests and wade through the output. If that would be useful to anyone else, I put it here: https://github.com/Elliot-Roberts/rust_doctest_fixing_tool
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‎compiler/rustc_ast/src/ast.rs‎

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@@ -573,7 +573,7 @@ pub struct Block {
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pub span: Span,
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pub tokens: Option<LazyTokenStream>,
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/// The following *isn't* a parse error, but will cause multiple errors in following stages.
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/// ```
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/// ```compile_fail
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/// let x = {
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/// foo: var
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/// };

‎compiler/rustc_ast_lowering/src/expr.rs‎

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@@ -616,7 +616,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
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}
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/// Desugar `<expr>.await` into:
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/// ```rust
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/// ```ignore (pseudo-rust)
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/// match ::std::future::IntoFuture::into_future(<expr>) {
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/// mut __awaitee => loop {
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/// match unsafe { ::std::future::Future::poll(
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}
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/// Desugar `ExprForLoop` from: `[opt_ident]: for <pat> in <head> <body>` into:
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/// ```rust
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/// ```ignore (pseudo-rust)
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/// {
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/// let result = match IntoIterator::into_iter(<head>) {
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/// mut iter => {
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}
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/// Desugar `ExprKind::Try` from: `<expr>?` into:
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/// ```rust
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/// ```ignore (pseudo-rust)
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/// match Try::branch(<expr>) {
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/// ControlFlow::Continue(val) => #[allow(unreachable_code)] val,,
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/// ControlFlow::Break(residual) =>

‎compiler/rustc_ast_lowering/src/lib.rs‎

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@@ -920,7 +920,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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/// Given an associated type constraint like one of these:
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///
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/// ```
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/// ```ignore (illustrative)
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/// T: Iterator<Item: Debug>
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/// ^^^^^^^^^^^
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/// T: Iterator<Item = Debug>

‎compiler/rustc_ast_pretty/src/pp.rs‎

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//! will be made to flow subsequent breaks together onto lines. Inconsistent
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//! is the opposite. Inconsistent breaking example would be, say:
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//!
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//! ```
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//! ```ignore (illustrative)
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//! foo(hello, there, good, friends)
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//! ```
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//!
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//! breaking inconsistently to become
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//!
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//! ```
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//! ```ignore (illustrative)
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//! foo(hello, there,
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//! good, friends);
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//! ```
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//!
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//! whereas a consistent breaking would yield:
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//!
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//! ```
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//! ```ignore (illustrative)
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//! foo(hello,
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//! there,
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//! good,
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/// Vertically aligned under whatever column this block begins at.
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///
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/// fn demo(arg1: usize,
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/// arg2: usize);
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/// arg2: usize) {}
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Visual,
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/// Indented relative to the indentation level of the previous line.
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///
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/// fn demo(
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/// arg1: usize,
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/// arg2: usize,
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/// );
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/// ) {}
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Block { offset: isize },
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}
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‎compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs‎

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///
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/// In the simplest case, where there are no unions involved, if a mutable borrow of `x` is
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/// attempted while a shared borrow is live, then this function will return:
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///
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/// ("x", "", "")
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///
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/// ```
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/// ("x", "", "")
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/// # ;
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/// ```
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/// In the simple union case, if a mutable borrow of a union field `x.z` is attempted while
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/// a shared borrow of another field `x.y`, then this function will return:
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///
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/// ("x", "x.z", "x.y")
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///
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/// ```
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/// ("x", "x.z", "x.y")
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/// # ;
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/// ```
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/// In the more complex union case, where the union is a field of a struct, then if a mutable
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/// borrow of a union field in a struct `x.u.z` is attempted while a shared borrow of
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/// another field `x.u.y`, then this function will return:
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///
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/// ("x.u", "x.u.z", "x.u.y")
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///
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/// ```
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/// ("x.u", "x.u.z", "x.u.y")
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/// # ;
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/// ```
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/// This is used when creating error messages like below:
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///
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/// ```text

‎compiler/rustc_borrowck/src/diagnostics/region_errors.rs‎

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/// Report an error because the universal region `fr` was required to outlive
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/// `outlived_fr` but it is not known to do so. For example:
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///
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/// ```
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/// ```compile_fail,E0312
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/// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
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/// ```
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///

‎compiler/rustc_borrowck/src/diagnostics/region_name.rs‎

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/// ```ignore (pseudo-rust)
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/// fn foo(x: &u32) { .. }
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/// ```
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///
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/// async fn foo() -> i32 { 2 }
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/// ```
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/// this function, given the lowered return type of `foo`, an [`OpaqueDef`] that implements `Future<Output=i32>`,

‎compiler/rustc_borrowck/src/member_constraints.rs‎

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/// Returns the "choice regions" for a given member
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/// ```text
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crate fn choice_regions(&self, pci: NllMemberConstraintIndex) -> &[ty::RegionVid] {
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///
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/// Before:
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/// ```text
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/// ```text
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fn append_list(

‎compiler/rustc_borrowck/src/region_infer/mod.rs‎

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/// minimum values.
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/// ```
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/// fn foo<'a, 'b>( /* ... */ ) where 'a: 'b { /* ... */ }
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/// ```
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/// would initialize two variables like so:
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/// R1 = { CFG, R0, R1 } // 'b
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///
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/// ```ignore (illustrative)
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/// R0 = { CFG, R0 } // 'a
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/// R1 = { CFG, R0, R1 } // 'b
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/// ```
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/// Here, R0 represents `'a`, and it contains (a) the entire CFG
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/// and (b) any universally quantified regions that it outlives,
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/// whether any of the constraints were too strong. In particular,
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/// we want to check for a case where a universally quantified
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/// region exceeded its bounds. Consider:
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/// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
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///
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/// ```compile_fail,E0312
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/// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
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/// ```
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/// In this case, returning `x` requires `&'a u32 <: &'b u32`
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/// and hence we establish (transitively) a constraint that
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/// `'a: 'b`. The `propagate_constraints` code above will
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/// <https://smallcultfollowing.com/babysteps/blog/2019/01/17/polonius-and-region-errors/>
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/// In the canonical example
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///
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/// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
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///
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/// ```compile_fail,E0312
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/// fn foo<'a, 'b>(x: &'a u32) -> &'b u32 { x }
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/// ```
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/// returning `x` requires `&'a u32 <: &'b u32` and hence we establish (transitively) a
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/// constraint that `'a: 'b`. It is an error that we have no evidence that this
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/// constraint holds.

‎compiler/rustc_borrowck/src/type_check/mod.rs‎

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/// things like the type of the return slot. Consider this
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/// example:
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///
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/// ```
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/// ```compile_fail,E0515
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/// fn foo<'a>(x: &'a u32) -> &'a u32 {
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/// let y = 22;
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/// return &y; // error

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