experiment: try setting -Zforce-unstable-if-unmarked

.github/workflows/ci.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - 'master'
+      - 'ci'
   pull_request:
     branches:
       - 'master'

ci-test.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -euo pipefail
 
-DEFAULTFLAGS="-Zmiri-retag-fields -Zrandomize-layout -Zmiri-strict-provenance"
+DEFAULTFLAGS="-Zmiri-retag-fields -Zrandomize-layout -Zmiri-strict-provenance -Zforce-unstable-if-unmarked"
 
 # apply our patch
 rm -rf rust-src-patched

rust-src.diff

@@ -1,84 +0,0 @@
-diff --git a/library/core/src/error.rs b/library/core/src/error.rs
-index c32a54b77ef..1170221c10c 100644
---- a/library/core/src/error.rs
-+++ b/library/core/src/error.rs
-@@ -130,6 +130,7 @@ fn cause(&self) -> Option<&dyn Error> {
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     /// use core::fmt;
-     /// use core::error::{request_ref, Request};
-     ///
-@@ -360,6 +361,7 @@ pub fn sources(&self) -> Source<'_> {
- ///
- /// ```rust
- /// # #![feature(error_generic_member_access)]
-+/// # #![feature(error_in_core)]
- /// use std::error::Error;
- /// use core::error::request_value;
- ///
-@@ -383,6 +385,7 @@ pub fn request_value<'a, T>(err: &'a (impl Error + ?Sized)) -> Option<T>
- ///
- /// ```rust
- /// # #![feature(error_generic_member_access)]
-+/// # #![feature(error_in_core)]
- /// use core::error::Error;
- /// use core::error::request_ref;
- ///
-@@ -454,6 +457,7 @@ fn request_by_type_tag<'a, I>(err: &'a (impl Error + ?Sized)) -> Option<I::Reifi
- ///
- /// ```
- /// #![feature(error_generic_member_access)]
-+/// #![feature(error_in_core)]
- /// use core::fmt;
- /// use core::error::Request;
- /// use core::error::request_ref;
-@@ -524,6 +528,7 @@ fn new<'b>(erased: &'b mut (dyn Erased<'a> + 'a)) -> &'b mut Request<'a> {
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     ///
-@@ -558,6 +563,7 @@ pub fn provide_value<T>(&mut self, value: T) -> &mut Self
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     ///
-@@ -593,6 +599,7 @@ pub fn provide_value_with<T>(&mut self, fulfil: impl FnOnce() -> T) -> &mut Self
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     ///
-@@ -625,6 +632,7 @@ pub fn provide_ref<T: ?Sized + 'static>(&mut self, value: &'a T) -> &mut Self {
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     ///
-@@ -691,6 +699,7 @@ fn provide_with<I>(&mut self, fulfil: impl FnOnce() -> I::Reified) -> &mut Self
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     /// use core::error::request_value;
-@@ -778,6 +787,7 @@ pub fn would_be_satisfied_by_value_of<T>(&self) -> bool
-     ///
-     /// ```rust
-     /// #![feature(error_generic_member_access)]
-+    /// #![feature(error_in_core)]
-     ///
-     /// use core::error::Request;
-     /// use core::error::request_ref;