1 files changed, 14 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-15783.rs b/tests/ui/issues/issue-15783.rs
new file mode 100644
index 00000000000..0b1f4545e88
--- /dev/null
+++ b/tests/ui/issues/issue-15783.rs
@@ -0,0 +1,14 @@
+pub fn foo(params: Option<&[&str]>) -> usize {
+    params.unwrap().first().unwrap().len()
+}
+
+fn main() {
+    let name = "Foo";
+    let x = Some(&[name]);
+    let msg = foo(x);
+    //~^ ERROR mismatched types
+    //~| expected enum `Option<&[&str]>`
+    //~| found enum `Option<&[&str; 1]>`
+    //~| expected slice `[&str]`, found array `[&str; 1]`
+    assert_eq!(msg, 3);
+}