Auto merge of #56518 - pietroalbini:stable-additions, r=pietroalbini 1.31.0

[stable] Add a few critical fixes to the 1.31.0 release

This PR cherry-picks the following PRs to stable:

* #56467: Bump stack size to 32MB
* #56486: Propagate all closure requirements to the caller
* #56519: update edition guide

The changes will be included in the final 1.31.0 binary (to avoid a point release). To deploy the build to dev-static the old manifest needs to be removed from the bucket after the PR is merged.

cc @rust-lang/core @rust-lang/release @rust-lang/compiler
r? @alexcrichton

2 files changed, 6 insertions, 4 deletions

diff --git a/src/librustc_driver/driver.rs b/src/librustc_driver/driver.rs
index 7ad012409b5..07803d06598 100644
--- a/src/librustc_driver/driver.rs
+++ b/src/librustc_driver/driver.rs
@@ -91,7 +91,7 @@ pub fn spawn_thread_pool<F: FnOnce(config::Options) -> R + sync::Send, R: sync::
     let config = ThreadPoolBuilder::new()
         .num_threads(Session::query_threads_from_opts(&opts))
         .deadlock_handler(|| unsafe { ty::query::handle_deadlock() })
-        .stack_size(16 * 1024 * 1024);
+        .stack_size(::STACK_SIZE);
 
     let with_pool = move |pool: &ThreadPool| {
         pool.install(move || f(opts))
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index 276b7290c2e..9a0d461444c 100644
--- a/src/librustc_driver/lib.rs
+++ b/src/librustc_driver/lib.rs
@@ -1460,6 +1460,11 @@ fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<as
     }
 }
 
+// Temporarily have stack size set to 32MB to deal with various crates with long method
+// chains or deep syntax trees.
+// FIXME(oli-obk): get https://github.com/rust-lang/rust/pull/55617 the finish line
+const STACK_SIZE: usize = 32 * 1024 * 1024; // 32MB
+
 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
 /// value of `f` or -- if a panic occurs -- the panic value.
 ///
@@ -1469,9 +1474,6 @@ pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any
     where F: FnOnce() -> R + Send + 'static,
           R: Send + 'static,
 {
-    // Temporarily have stack size set to 16MB to deal with nom-using crates failing
-    const STACK_SIZE: usize = 16 * 1024 * 1024; // 16MB
-
     #[cfg(all(unix, not(target_os = "haiku")))]
     let spawn_thread = unsafe {
         // Fetch the current resource limits