diff --git a/tests/ui/native-library-link-flags/modifiers-bad.blank.stderr b/tests/ui/native-library-link-flags/modifiers-bad.blank.stderr
new file mode 100644
index 00000000000..ea36af0b4cf
--- /dev/null
+++ b/tests/ui/native-library-link-flags/modifiers-bad.blank.stderr
@@ -0,0 +1,2 @@
+error: invalid linking modifier syntax, expected '+' or '-' prefix before one of: bundle, verbatim, whole-archive, as-needed
+
diff --git a/tests/ui/native-library-link-flags/modifiers-bad.no-prefix.stderr b/tests/ui/native-library-link-flags/modifiers-bad.no-prefix.stderr
new file mode 100644
index 00000000000..ea36af0b4cf
--- /dev/null
+++ b/tests/ui/native-library-link-flags/modifiers-bad.no-prefix.stderr
@@ -0,0 +1,2 @@
+error: invalid linking modifier syntax, expected '+' or '-' prefix before one of: bundle, verbatim, whole-archive, as-needed
+
diff --git a/tests/ui/native-library-link-flags/modifiers-bad.prefix-only.stderr b/tests/ui/native-library-link-flags/modifiers-bad.prefix-only.stderr
new file mode 100644
index 00000000000..1e701374688
--- /dev/null
+++ b/tests/ui/native-library-link-flags/modifiers-bad.prefix-only.stderr
@@ -0,0 +1,2 @@
+error: unknown linking modifier ``, expected one of: bundle, verbatim, whole-archive, as-needed
+
diff --git a/tests/ui/native-library-link-flags/modifiers-bad.rs b/tests/ui/native-library-link-flags/modifiers-bad.rs
new file mode 100644
index 00000000000..185201e0d84
--- /dev/null
+++ b/tests/ui/native-library-link-flags/modifiers-bad.rs
@@ -0,0 +1,11 @@
+//@ edition: 2021
+//@ revisions: blank no-prefix prefix-only unknown
+
+//@[blank] compile-flags: -l static:=foo
+//@[no-prefix] compile-flags: -l static:bundle=foo
+//@[prefix-only] compile-flags: -l static:+=foo
+//@[unknown] compile-flags: -l static:+ferris=foo
+
+// Tests various illegal values for the "modifier" part of an `-l` flag.
+
+fn main() {}
diff --git a/tests/ui/native-library-link-flags/modifiers-bad.unknown.stderr b/tests/ui/native-library-link-flags/modifiers-bad.unknown.stderr
new file mode 100644
index 00000000000..75950ad9c64
--- /dev/null
+++ b/tests/ui/native-library-link-flags/modifiers-bad.unknown.stderr
@@ -0,0 +1,2 @@
+error: unknown linking modifier `ferris`, expected one of: bundle, verbatim, whole-archive, as-needed
+