From 3fcdd182e9784cb9c2d7ff54b44ec00bd6c91a87 Mon Sep 17 00:00:00 2001
From: Stella Laurenzo <stellaraccident@gmail.com>
Date: Fri, 19 Nov 2021 20:32:21 +0000
Subject: [PATCH] NFC: Callout restriction on folding 0-result ops in
 documentation.

Differential Revision: https://reviews.llvm.org/D114271
---
 mlir/docs/Canonicalization.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mlir/docs/Canonicalization.md b/mlir/docs/Canonicalization.md
index f2f6d7d751f5..1b017ad90511 100644
--- a/mlir/docs/Canonicalization.md
+++ b/mlir/docs/Canonicalization.md
@@ -161,6 +161,7 @@ Otherwise, the following is generated:
 ///     the operation, partial folding is not supported. The caller will remove
 ///     the operation and use those results instead.
 ///
+/// Note that this mechanism cannot be used to remove 0-result operations.
 LogicalResult MyOp::fold(ArrayRef<Attribute> operands,
                          SmallVectorImpl<OpFoldResult> &results) {
   ...