1 files changed, 34 insertions, 0 deletions

diff --git a/src/test/ui/parser/issues/issue-23620-invalid-escapes.rs b/src/test/ui/parser/issues/issue-23620-invalid-escapes.rs
new file mode 100644
index 000000000..c1355f0d6
--- /dev/null
+++ b/src/test/ui/parser/issues/issue-23620-invalid-escapes.rs
@@ -0,0 +1,34 @@
+fn main() {
+    let _ = b"\u{a66e}";
+    //~^ ERROR unicode escape in byte string
+
+    let _ = b'\u{a66e}';
+    //~^ ERROR unicode escape in byte string
+
+    let _ = b'\u';
+    //~^ ERROR incorrect unicode escape sequence
+
+    let _ = b'\x5';
+    //~^ ERROR numeric character escape is too short
+
+    let _ = b'\xxy';
+    //~^ ERROR invalid character in numeric character escape: `x`
+
+    let _ = '\x5';
+    //~^ ERROR numeric character escape is too short
+
+    let _ = '\xxy';
+    //~^ ERROR invalid character in numeric character escape: `x`
+
+    let _ = b"\u{a4a4} \xf \u";
+    //~^ ERROR unicode escape in byte string
+    //~^^ ERROR invalid character in numeric character escape: ` `
+    //~^^^ ERROR incorrect unicode escape sequence
+
+    let _ = "\xf \u";
+    //~^ ERROR invalid character in numeric character escape: ` `
+    //~^^ ERROR incorrect unicode escape sequence
+
+    let _ = "\u8f";
+    //~^ ERROR incorrect unicode escape sequence
+}