From 24b6d7194f85892f09c7104924ce607ff231af6f Mon Sep 17 00:00:00 2001
From: Soheil Hassas Yeganeh <soheil@google.com>
Date: Thu, 18 Oct 2018 16:37:07 -0400
Subject: [PATCH] Add comment for grpc_error_get_int().

Explain that the input parameter cannot be nullptr.
---
 src/core/lib/iomgr/error.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/lib/iomgr/error.h b/src/core/lib/iomgr/error.h
index 6978ef6d91e..cb740d5b01c 100644
--- a/src/core/lib/iomgr/error.h
+++ b/src/core/lib/iomgr/error.h
@@ -194,6 +194,8 @@ inline void grpc_error_unref(grpc_error* err) {
 
 grpc_error* grpc_error_set_int(grpc_error* src, grpc_error_ints which,
                                intptr_t value) GRPC_MUST_USE_RESULT;
+/// It is an error to pass nullptr as `p`. Caller should allocate a dummy
+/// intptr_t for `p`, even if the value of `p` is not used.
 bool grpc_error_get_int(grpc_error* error, grpc_error_ints which, intptr_t* p);
 /// This call takes ownership of the slice; the error is responsible for
 /// eventually unref-ing it.