From 4cfbb5d90bd253c066d92affa685dbab5d824699 Mon Sep 17 00:00:00 2001
From: Alon Zakai <azakai@google.com>
Date: Tue, 11 May 2021 16:16:53 -0700
Subject: Printing: Add a comment when we cannot emit something (#3878)

If we can't emit something, and instead emit a replacement for it (as is
the case for a StructSet with an unreachable RTT, so we have no known
heap type for it), add a comment that mentions it is a replacement. This
might avoid confusion while debugging.
---
 src/passes/Print.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/passes/Print.cpp')

diff --git a/src/passes/Print.cpp b/src/passes/Print.cpp
index ef78bf582..41e800352 100644
--- a/src/passes/Print.cpp
+++ b/src/passes/Print.cpp
@@ -2351,6 +2351,9 @@ struct PrintSExpression : public UnifiedExpressionVisitor<PrintSExpression> {
     //
     // Emit a block with drops of the children.
     o << "(block";
+    if (!minify) {
+      o << " ;; (replaces something unreachable we can't emit)";
+    }
     incIndent();
     for (auto* child : ChildIterator(curr)) {
       Drop drop;
-- 
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