From f1a66055abaaeaf5ef4fe2370c9b603c5dbec497 Mon Sep 17 00:00:00 2001
From: Dominic Evans <dominic.evans@uk.ibm.com>
Date: Fri, 10 Feb 2023 15:12:05 +0000
Subject: [PATCH] feat: add rule for deprecated rand.Seed in Go 1.20

---
 ruleguard.rules.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ruleguard.rules.go b/ruleguard.rules.go
index 623f3c3..8937873 100644
--- a/ruleguard.rules.go
+++ b/ruleguard.rules.go
@@ -560,3 +560,10 @@ func ioStringWriterWriteStringMisuse(m dsl.Matcher) {
 		Report(`Use Write when writing a []byte to an io.Writer`).
 		Suggest(`$w.Write($b)`)
 }
+
+func randSeed(m dsl.Matcher) {
+	m.Match(
+		`rand.Seed($s)`,
+	).Report(`As of Go 1.20, the math.Seed func is deprecated as programs should not use the global default source.`).
+		Suggest(`rand.New(rand.NewSource($s))`)
+}