Auto merge of #80692 - Aaron1011:feature/query-result-debug, r=estebank

Enforce that query results implement Debug

Currently, we require that query keys implement `Debug`, but we do not do the same for query values. This can make incremental compilation bugs difficult to debug - there isn't a good place to print out the result loaded from disk.

This PR adds `Debug` bounds to several query-related functions, allowing us to debug-print the query value when an 'unstable fingerprint' error occurs. This required adding `#[derive(Debug)]` to a fairly large number of types - hopefully, this doesn't have much of an impact on compiler bootstrapping times.

compiler/rustc_middle/src/hir/map/mod.rs

@@ -85,11 +85,13 @@ fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
     }
 }
 
+#[derive(Debug)]
 pub(super) struct HirOwnerData<'hir> {
     pub(super) signature: Option<&'hir Owner<'hir>>,
     pub(super) with_bodies: Option<&'hir mut OwnerNodes<'hir>>,
 }
 
+#[derive(Debug)]
 pub struct IndexedHir<'hir> {
     /// The SVH of the local crate.
     pub crate_hash: Svh,

compiler/rustc_middle/src/hir/mod.rs

@@ -17,6 +17,7 @@ use rustc_hir::*;
 use rustc_index::vec::IndexVec;
 use rustc_span::DUMMY_SP;
 
+#[derive(Debug)]
 pub struct Owner<'tcx> {
     parent: HirId,
     node: Node<'tcx>,
@@ -32,12 +33,13 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Owner<'tcx> {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct ParentedNode<'tcx> {
     parent: ItemLocalId,
     node: Node<'tcx>,
 }
 
+#[derive(Debug)]
 pub struct OwnerNodes<'tcx> {
     hash: Fingerprint,
     nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,