From 3fa1386145201d0e92c7f98286b2c47e5053068f Mon Sep 17 00:00:00 2001
From: Katie Hockman <katie@golang.org>
Date: Thu, 16 Sep 2021 10:34:46 -0400
Subject: [PATCH] [dev.fuzz] internal/fuzz: warn if fuzzing begins with empty
 corpus

Fixes golang/go#46219

Change-Id: I7b32707d490c046d15324a3d297ec8d9f45b6e36
Reviewed-on: https://go-review.googlesource.com/c/go/+/350269
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
---
 fuzz/fuzz.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fuzz/fuzz.go b/fuzz/fuzz.go
index 7343e17..99cf39e 100644
--- a/fuzz/fuzz.go
+++ b/fuzz/fuzz.go
@@ -641,6 +641,7 @@ func newCoordinator(opts CoordinateFuzzingOpts) (*coordinator, error) {
 	}
 
 	if len(c.corpus.entries) == 0 {
+		fmt.Fprintf(c.opts.Log, "warning: starting with empty corpus\n")
 		var vals []interface{}
 		for _, t := range opts.Types {
 			vals = append(vals, zeroValue(t))