From 27717dbd4d0df888e66661690199d5dd07078259 Mon Sep 17 00:00:00 2001
From: Andrew Zhogin <andrew.zhogin@gmail.com>
Date: Mon, 22 Jan 2024 00:58:50 +0700
Subject: [PATCH] Builtin macros effectively have implicit
 #[collapse_debuginfo(yes)] attribute

---
 compiler/rustc_expand/src/base.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index 29b70f33a6c7d..657e19277a7ed 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -796,9 +796,15 @@ impl SyntaxExtension {
     /// | external      | no  | if-ext        | if-ext   | yes |
     /// | yes           | yes | yes           | yes      | yes |
     fn get_collapse_debuginfo(sess: &Session, attrs: &[ast::Attribute], is_local: bool) -> bool {
-        let collapse_debuginfo_attr = attr::find_by_name(attrs, sym::collapse_debuginfo)
+        let mut collapse_debuginfo_attr = attr::find_by_name(attrs, sym::collapse_debuginfo)
             .map(|v| Self::collapse_debuginfo_by_name(sess, v))
             .unwrap_or(CollapseMacroDebuginfo::Unspecified);
+        if collapse_debuginfo_attr == CollapseMacroDebuginfo::Unspecified
+            && attr::contains_name(attrs, sym::rustc_builtin_macro)
+        {
+            collapse_debuginfo_attr = CollapseMacroDebuginfo::Yes;
+        }
+
         let flag = sess.opts.unstable_opts.collapse_macro_debuginfo;
         let attr = collapse_debuginfo_attr;
         let ext = !is_local;