Auto merge of #83308 - Dylan-DPC:rollup-p2j6sy8, r=Dylan-DPC

Rollup of 8 pull requests

Successful merges:

 - #79986 (Only build help popup when it's really needed)
 - #82570 (Add `as_str` method for split whitespace str iterators)
 - #83244 (Fix overflowing length in Vec<ZST> to VecDeque)
 - #83254 (Include output stream in `panic!()` documentation)
 - #83269 (Revert the second deprecation of collections::Bound)
 - #83277 (Mark early otherwise optimization unsound)
 - #83285 (Update LLVM to bring in SIMD updates for WebAssembly)
 - #83297 (Do not ICE on ty::Error as an error must already have been reported)

Failed merges:

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

2 files changed, 14 insertions, 5 deletions

diff --git a/compiler/rustc_middle/src/ty/relate.rs b/compiler/rustc_middle/src/ty/relate.rs
index 436ca4c0578..b41bf70e88e 100644
--- a/compiler/rustc_middle/src/ty/relate.rs
+++ b/compiler/rustc_middle/src/ty/relate.rs
@@ -10,6 +10,7 @@ use crate::ty::subst::{GenericArg, GenericArgKind, SubstsRef};
 use crate::ty::{self, Ty, TyCtxt, TypeFoldable};
 use rustc_hir as ast;
 use rustc_hir::def_id::DefId;
+use rustc_span::DUMMY_SP;
 use rustc_target::spec::abi;
 use std::iter;
 
@@ -499,11 +500,14 @@ pub fn super_relate_consts<R: TypeRelation<'tcx>>(
 
     // FIXME(oli-obk): once const generics can have generic types, this assertion
     // will likely get triggered. Move to `normalize_erasing_regions` at that point.
-    assert_eq!(
-        tcx.erase_regions(a.ty),
-        tcx.erase_regions(b.ty),
-        "cannot relate constants of different types"
-    );
+    let a_ty = tcx.erase_regions(a.ty);
+    let b_ty = tcx.erase_regions(b.ty);
+    if a_ty != b_ty {
+        relation.tcx().sess.delay_span_bug(
+            DUMMY_SP,
+            &format!("cannot relate constants of different types: {} != {}", a_ty, b_ty),
+        );
+    }
 
     let eagerly_eval = |x: &'tcx ty::Const<'tcx>| x.eval(tcx, relation.param_env());
     let a = eagerly_eval(a);
diff --git a/compiler/rustc_mir/src/transform/early_otherwise_branch.rs b/compiler/rustc_mir/src/transform/early_otherwise_branch.rs
index e64a539c7f8..f7ea9faec47 100644
--- a/compiler/rustc_mir/src/transform/early_otherwise_branch.rs
+++ b/compiler/rustc_mir/src/transform/early_otherwise_branch.rs
@@ -26,6 +26,11 @@ pub struct EarlyOtherwiseBranch;
 
 impl<'tcx> MirPass<'tcx> for EarlyOtherwiseBranch {
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
+        //  FIXME(#78496)
+        if !tcx.sess.opts.debugging_opts.unsound_mir_opts {
+            return;
+        }
+
         if tcx.sess.mir_opt_level() < 3 {
             return;
         }