1 files changed, 15 insertions, 0 deletions
diff --git a/compiler/rustc_parse_format/src/tests.rs b/compiler/rustc_parse_format/src/tests.rs
index 2f8c229c6..3f9cb149b 100644
--- a/compiler/rustc_parse_format/src/tests.rs
+++ b/compiler/rustc_parse_format/src/tests.rs
@@ -58,6 +58,21 @@ fn invalid06() {
 }
 
 #[test]
+fn invalid_position() {
+    musterr("{18446744073709551616}");
+}
+
+#[test]
+fn invalid_width() {
+    musterr("{:18446744073709551616}");
+}
+
+#[test]
+fn invalid_precision() {
+    musterr("{:.18446744073709551616}");
+}
+
+#[test]
 fn format_nothing() {
     same(
         "{}",