From 1e740c766976afc944776c428837dce3e65e3705 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 30 Oct 2024 10:18:00 -0400
Subject: [PATCH] cmd/compile: fix an internal crash in embed

Observed in the telemetry data. Was causing truncated error outputs.

Change-Id: I9f0a86e1e6caa855f97a3d6e51328c4c9685c937
Reviewed-on: https://go-review.googlesource.com/c/go/+/623535
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>
---
 src/cmd/compile/internal/staticdata/embed.go |  3 +++
 src/cmd/compile/testdata/script/embedbad.txt | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 src/cmd/compile/testdata/script/embedbad.txt

diff --git a/src/cmd/compile/internal/staticdata/embed.go b/src/cmd/compile/internal/staticdata/embed.go
index be939db877..28468bda03 100644
--- a/src/cmd/compile/internal/staticdata/embed.go
+++ b/src/cmd/compile/internal/staticdata/embed.go
@@ -113,6 +113,9 @@ func WriteEmbed(v *ir.Name) {
 	}
 
 	files := embedFileList(v, kind)
+	if base.Errors() > 0 {
+		return
+	}
 	switch kind {
 	case embedString, embedBytes:
 		file := files[0]
diff --git a/src/cmd/compile/testdata/script/embedbad.txt b/src/cmd/compile/testdata/script/embedbad.txt
new file mode 100644
index 0000000000..09e4254561
--- /dev/null
+++ b/src/cmd/compile/testdata/script/embedbad.txt
@@ -0,0 +1,19 @@
+# Check that compiler does not silently crash at bad embed error.
+
+! go build
+stderr 'multiple files for type string'
+stderr 'multiple files for type \[\]byte'
+
+-- go.mod --
+module m
+
+-- x.go --
+package p
+
+import _ "embed"
+
+//go:embed x.go go.mod
+var s string
+
+//go:embed x.go go.mod
+var b []byte
-- 
2.48.1