missing_panics_doc: pickup expect method

clippy_lints/src/doc.rs

@@ -916,8 +916,8 @@ impl<'a, 'tcx> Visitor<'tcx> for FindPanicUnwrap<'a, 'tcx> {
             }
         }
 
-        // check for `unwrap`
-        if let Some(arglists) = method_chain_args(expr, &["unwrap"]) {
+        // check for `unwrap` and `expect` both `Option` and `Result`
+        if let Some(arglists) = method_chain_args(expr, &["unwrap"]).or(method_chain_args(expr, &["expect"])) {
             let receiver_ty = self.typeck_results.expr_ty(arglists[0].0).peel_refs();
             if is_type_diagnostic_item(self.cx, receiver_ty, sym::Option)
                 || is_type_diagnostic_item(self.cx, receiver_ty, sym::Result)

tests/ui/doc/missing_panics_doc.rs

@@ -0,0 +1,31 @@
+#![warn(clippy::missing_panics_doc)]
+
+pub fn option_unwrap<T>(v: &[T]) -> &T {
+    let o: Option<&T> = v.last();
+    o.unwrap()
+}
+
+pub fn option_expect<T>(v: &[T]) -> &T {
+    let o: Option<&T> = v.last();
+    o.expect("passed an empty thing")
+}
+
+pub fn result_unwrap<T>(v: &[T]) -> &T {
+    let res: Result<&T, &str> = v.last().ok_or("oh noes");
+    res.unwrap()
+}
+
+pub fn result_expect<T>(v: &[T]) -> &T {
+    let res: Result<&T, &str> = v.last().ok_or("oh noes");
+    res.expect("passed an empty thing")
+}
+
+pub fn last_unwrap(v: &[u32]) -> u32 {
+    *v.last().unwrap()
+}
+
+pub fn last_expect(v: &[u32]) -> u32 {
+    *v.last().expect("passed an empty thing")
+}
+
+fn main() {}