1 files changed, 34 insertions, 0 deletions
diff --git a/src/cmd/go/testdata/script/work_reject_modfile.txt b/src/cmd/go/testdata/script/work_reject_modfile.txt
new file mode 100644
index 0000000..f0cfa3b
--- /dev/null
+++ b/src/cmd/go/testdata/script/work_reject_modfile.txt
@@ -0,0 +1,34 @@
+# Test that -modfile=path/to/go.mod is rejected in workspace mode.
+
+! go list -m -modfile=./a/go.alt.mod
+stderr 'go: -modfile cannot be used in workspace mode'
+
+env GOFLAGS=-modfile=./a/go.alt.mod
+! go list -m
+stderr 'go: -modfile cannot be used in workspace mode'
+
+-- go.work --
+go 1.20
+
+use (
+    ./a
+)
+
+-- a/go.mod --
+module example.com/foo
+
+go 1.20
+
+-- a/go.alt.mod --
+module example.com/foo
+
+go 1.20
+
+-- a/main.go --
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello world!")
+}