Add handling for None.unwrap_or(_else)

Author: syvb

clippy_lints/src/methods/unnecessary_literal_unwrap.rs

@@ -72,6 +72,24 @@ pub(super) fn check(
                 };
                 Some(vec![(expr.span, format!("{default_ty_string}::default()"))])
             },
+            ("None", "unwrap_or", _) => Some(vec![
+                (expr.span.with_hi(args[0].span.lo()), String::new()),
+                (expr.span.with_lo(args[0].span.hi()), String::new()),
+            ]),
+            ("None", "unwrap_or_else", _) => match args[0].kind {
+                hir::ExprKind::Closure(hir::Closure {
+                    fn_decl:
+                        hir::FnDecl {
+                            output: hir::FnRetTy::DefaultReturn(span) | hir::FnRetTy::Return(hir::Ty { span, .. }),
+                            ..
+                        },
+                    ..
+                }) => Some(vec![
+                    (expr.span.with_hi(span.hi()), String::new()),
+                    (expr.span.with_lo(args[0].span.hi()), String::new()),
+                ]),
+                _ => None,
+            },
             _ if call_args.is_empty() => None,
             (_, _, Some(_)) => None,
             ("Ok", "unwrap_err", None) | ("Err", "unwrap", None) => Some(vec![

tests/ui/unnecessary_literal_unwrap.fixed

@@ -16,14 +16,23 @@ fn unwrap_option_some() {
     1;
 }
 
+#[rustfmt::skip] // force rustfmt not to remove braces in `|| { 234 }`
 fn unwrap_option_none() {
     let _val = panic!();
     let _val = panic!("this always happens");
     let _val: String = String::default();
+    let _val: u16 = 234;
+    let _val: u16 = 234;
+    let _val: u16 = { 234 };
+    let _val: u16 =  { 234 };
 
     panic!();
     panic!("this always happens");
     String::default();
+    234;
+    234;
+    { 234 };
+     { 234 };
 }
 
 fn unwrap_result_ok() {

tests/ui/unnecessary_literal_unwrap.rs

@@ -16,14 +16,23 @@ fn unwrap_option_some() {
     Some(1).expect("this never happens");
 }
 
+#[rustfmt::skip] // force rustfmt not to remove braces in `|| { 234 }`
 fn unwrap_option_none() {
     let _val = None::<()>.unwrap();
     let _val = None::<()>.expect("this always happens");
     let _val: String = None.unwrap_or_default();
+    let _val: u16 = None.unwrap_or(234);
+    let _val: u16 = None.unwrap_or_else(|| 234);
+    let _val: u16 = None.unwrap_or_else(|| { 234 });
+    let _val: u16 = None.unwrap_or_else(|| -> u16 { 234 });
 
     None::<()>.unwrap();
     None::<()>.expect("this always happens");
     None::<String>.unwrap_or_default();
+    None::<u16>.unwrap_or(234);
+    None::<u16>.unwrap_or_else(|| 234);
+    None::<u16>.unwrap_or_else(|| { 234 });
+    None::<u16>.unwrap_or_else(|| -> u16 { 234 });
 }
 
 fn unwrap_result_ok() {