result_map_or_into_option: add opt.map_or(None, |_| Some(y)) test

Author: nickrtorres

tests/ui/result_map_or_into_option.fixed

@@ -11,4 +11,9 @@ fn main() {
     // A non-Some `f` arg should not emit the lint
     let opt: Result<u32, &str> = Ok(1);
     let _ = opt.map_or(None, rewrap);
+
+    // A non-Some `f` closure where the argument is not used as the
+    // return should not emit the lint
+    let opt: Result<u32, &str> = Ok(1);
+    opt.map_or(None, |_x| Some(1));
 }

tests/ui/result_map_or_into_option.rs

@@ -11,4 +11,9 @@ fn main() {
     // A non-Some `f` arg should not emit the lint
     let opt: Result<u32, &str> = Ok(1);
     let _ = opt.map_or(None, rewrap);
+
+    // A non-Some `f` closure where the argument is not used as the
+    // return should not emit the lint
+    let opt: Result<u32, &str> = Ok(1);
+    opt.map_or(None, |_x| Some(1));
 }