From 26b9c793f1008e1c5cb1ca61f3c5892f8025f387 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Sun, 3 Jan 2021 17:56:59 +0800
Subject: Fixed nested eager macro bug

---
 crates/hir_expand/src/eager.rs | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'crates/hir_expand/src')

diff --git a/crates/hir_expand/src/eager.rs b/crates/hir_expand/src/eager.rs
index 6354b090d..ae7b51a08 100644
--- a/crates/hir_expand/src/eager.rs
+++ b/crates/hir_expand/src/eager.rs
@@ -218,6 +218,12 @@ fn eager_macro_recur(
             }
         };
 
+        // check if the whole original sytnax is replaced
+        // Note that SyntaxRewriter cannot replace the root node itself
+        if child.syntax() == &original {
+            return Ok(insert);
+        }
+
         rewriter.replace(child.syntax(), &insert);
     }
 
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