Rollup merge of #93024 - compiler-errors:inline-mir-bad-bounds, r=estebank

Do not ICE when inlining a function with un-satisfiable bounds

Fixes #93008
This is kinda a hack... but it's the fix I thought had the least blast-radius.

We use `normalize_param_env_or_error` to verify that the predicates in the param env are self-consistent, since with RevealAll, a bad predicate like `<&'static () as Clone>` will be evaluated with an empty ParamEnv (since it references no generics), and we'll raise an error for it.

1 files changed, 11 insertions, 2 deletions

diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs
index f0e4129b002..55ce5910c81 100644
--- a/compiler/rustc_mir_transform/src/inline.rs
+++ b/compiler/rustc_mir_transform/src/inline.rs
@@ -7,6 +7,7 @@ use rustc_index::vec::Idx;
 use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
 use rustc_middle::mir::visit::*;
 use rustc_middle::mir::*;
+use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::subst::Subst;
 use rustc_middle::ty::{self, ConstKind, Instance, InstanceDef, ParamEnv, Ty, TyCtxt};
 use rustc_span::{hygiene::ExpnKind, ExpnData, Span};
@@ -75,10 +76,18 @@ fn inline<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) -> bool {
         return false;
     }
 
+    let param_env = tcx.param_env_reveal_all_normalized(def_id);
+    let param_env = rustc_trait_selection::traits::normalize_param_env_or_error(
+        tcx,
+        def_id,
+        param_env,
+        ObligationCause::misc(body.span, hir_id),
+    );
+
     let mut this = Inliner {
         tcx,
-        param_env: tcx.param_env_reveal_all_normalized(body.source.def_id()),
-        codegen_fn_attrs: tcx.codegen_fn_attrs(body.source.def_id()),
+        param_env,
+        codegen_fn_attrs: tcx.codegen_fn_attrs(def_id),
         hir_id,
         history: Vec::new(),
         changed: false,