change flag name

Author: BoxyUwU

compiler/rustc_session/src/options.rs

@@ -1481,7 +1481,7 @@ options! {
     dump_solver_proof_tree: SolverProofTreeCondition = (SolverProofTreeCondition::OnRequest, parse_solver_proof_tree_condition, [UNTRACKED],
         "dump a proof tree for every goal evaluated by the new trait solver. If the flag is specified without any options after it
         then it defaults to `always`. If the flag is not specified at all it defaults to `on-request`."),
-    dump_solver_proof_tree_uses_cache: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
+    dump_solver_proof_tree_use_cache: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
         "determines whether proof tree generation uses the global cache"),
     dwarf_version: Option<u32> = (None, parse_opt_number, [TRACKED],
         "version of DWARF debug information to emit (default: 2 or 4, depending on platform)"),

compiler/rustc_trait_selection/src/solve/eval_ctxt.rs

@@ -183,7 +183,7 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
         let inspect = {
             let generate_proof_tree = match (
                 infcx.tcx.sess.opts.unstable_opts.dump_solver_proof_tree,
-                infcx.tcx.sess.opts.unstable_opts.dump_solver_proof_tree_uses_cache,
+                infcx.tcx.sess.opts.unstable_opts.dump_solver_proof_tree_use_cache,
                 generate_proof_tree,
             ) {
                 (_, Some(use_cache), GenerateProofTree::Yes(_)) => {