[gcc/devel/rust/master] rust-tree.cc: comment some important code instead of removing it.

[Thomas Schwinge]

https://gcc.gnu.org/g:0f8e2c1e2f5f0ed55d807703e45f598d9f00aca1

commit 0f8e2c1e2f5f0ed55d807703e45f598d9f00aca1
Author: Faisal Abbas <90.abbasfaisal@gmail.com>
Date:   Tue Aug 16 22:03:23 2022 +0100

    rust-tree.cc: comment some important code instead of removing it.

Diff:
---
 gcc/rust/backend/rust-tree.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/rust/backend/rust-tree.cc b/gcc/rust/backend/rust-tree.cc
index ce820f08eaa..996ade5783a 100644
--- a/gcc/rust/backend/rust-tree.cc
+++ b/gcc/rust/backend/rust-tree.cc
@@ -4805,6 +4805,13 @@ build_address (tree t)
 tree
 fold_builtin_source_location (location_t loc)
 {
+  //  if (source_location_impl == NULL_TREE)
+  //  {
+  //    auto_diagnostic_group d;
+  //    source_location_impl = get_source_location_impl_type (loc);
+  //    if (source_location_impl == error_mark_node)
+  // inform (loc, "evaluating %qs", "__builtin_source_location");
+  //  }
   if (source_location_impl == error_mark_node)
     return build_zero_cst (const_ptr_type_node);
   if (source_location_table == NULL)