Auto merge of #73046 - marmeladema:save-analysis-fix-path, r=Xanewok

save_analysis: fix some ICEs

Fixes #73020
Fixes #73022
Fixes #73041

src/librustc_save_analysis/dump_visitor.rs

@@ -210,9 +210,11 @@ fn write_sub_paths(&mut self, path: &'tcx hir::Path<'tcx>) {
     // As write_sub_paths, but does not process the last ident in the path (assuming it
     // will be processed elsewhere). See note on write_sub_paths about global.
     fn write_sub_paths_truncated(&mut self, path: &'tcx hir::Path<'tcx>) {
-        for seg in &path.segments[..path.segments.len() - 1] {
-            if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
-                self.dumper.dump_ref(data);
+        if let [segments @ .., _] = path.segments {
+            for seg in segments {
+                if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
+                    self.dumper.dump_ref(data);
+                }
             }
         }
     }

src/librustc_save_analysis/lib.rs

@@ -534,10 +534,14 @@ pub fn get_expr_data(&self, expr: &hir::Expr<'_>) -> Option<Data> {
                     }
                 }
             }
-            hir::ExprKind::Struct(hir::QPath::Resolved(_, path), ..) => {
+            hir::ExprKind::Struct(qpath, ..) => {
+                let segment = match qpath {
+                    hir::QPath::Resolved(_, path) => path.segments.last().unwrap(),
+                    hir::QPath::TypeRelative(_, segment) => segment,
+                };
                 match self.tables.expr_ty_adjusted(&hir_node).kind {
                     ty::Adt(def, _) if !def.is_enum() => {
-                        let sub_span = path.segments.last().unwrap().ident.span;
+                        let sub_span = segment.ident.span;
                         filter!(self.span_utils, sub_span);
                         let span = self.span_from_span(sub_span);
                         Some(Data::RefData(Ref {
@@ -580,7 +584,7 @@ pub fn get_expr_data(&self, expr: &hir::Expr<'_>) -> Option<Data> {
             }
             _ => {
                 // FIXME
-                bug!();
+                bug!("invalid expression: {:?}", expr);
             }
         }
     }

src/test/ui/save-analysis/issue-73020.rs

+// compile-flags: -Zsave-analysis
+use {self}; //~ ERROR E0431
+
+fn main () {
+}

src/test/ui/save-analysis/issue-73020.stderr

+error[E0431]: `self` import can only appear in an import list with a non-empty prefix
+  --> $DIR/issue-73020.rs:2:6
+   |
+LL | use {self};
+   |      ^^^^ can only appear in an import list with a non-empty prefix
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0431`.

src/test/ui/save-analysis/issue-73022.rs

+// build-pass
+// compile-flags: -Zsave-analysis
+enum Enum2 {
+    Variant8 { _field: bool },
+}
+
+impl Enum2 {
+    fn new_variant8() -> Enum2 {
+        Self::Variant8 { _field: true }
+    }
+}
+
+fn main() {}