Use its own TypeckResults to avoid ICE

Author: JohnTitor

compiler/rustc_save_analysis/src/lib.rs

@@ -630,9 +630,14 @@ impl<'tcx> SaveContext<'tcx> {
             })
             | Node::Ty(&hir::Ty { kind: hir::TyKind::Path(ref qpath), .. }) => match qpath {
                 hir::QPath::Resolved(_, path) => path.res,
-                hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => self
-                    .maybe_typeck_results
-                    .map_or(Res::Err, |typeck_results| typeck_results.qpath_res(qpath, hir_id)),
+                hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => {
+                    // #75962: `self.typeck_results` may be different from the `hir_id`'s result.
+                    if self.tcx.has_typeck_results(hir_id.owner.to_def_id()) {
+                        self.tcx.typeck(hir_id.owner).qpath_res(qpath, hir_id)
+                    } else {
+                        Res::Err
+                    }
+                }
             },
 
             Node::Binding(&hir::Pat {

src/test/ui/impl-trait/bound-normalization-pass.stderr renamed to src/test/ui/impl-trait/bound-normalization-pass.default.stderr

@@ -1,5 +1,5 @@
 warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/bound-normalization-pass.rs:5:12
+  --> $DIR/bound-normalization-pass.rs:8:12
    |
 LL | #![feature(impl_trait_in_bindings)]
    |            ^^^^^^^^^^^^^^^^^^^^^^

src/test/ui/impl-trait/bound-normalization-pass.rs

@@ -1,5 +1,8 @@
 // check-pass
 // edition:2018
+// revisions: default sa
+//[sa] compile-flags: -Z save-analysis
+//-^ To make this the regression test for #75962.
 
 #![feature(type_alias_impl_trait)]
 #![feature(impl_trait_in_bindings)]

src/test/ui/impl-trait/bound-normalization-pass.sa.stderr

@@ -0,0 +1,11 @@
+warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/bound-normalization-pass.rs:8:12
+   |
+LL | #![feature(impl_trait_in_bindings)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
+
+warning: 1 warning emitted
+