Reduce indentation and add comment about lint name

Author: flip1995

clippy_lints/src/option_if_let_else.rs

@@ -64,6 +64,8 @@ declare_clippy_lint! {
     ///     y*y
     /// }, |foo| foo);
     /// ```
+    // FIXME: Before moving this lint out of nursery, the lint name needs to be updated. It now also
+    // covers matches and `Result`.
     #[clippy::version = "1.47.0"]
     pub OPTION_IF_LET_ELSE,
     nursery,
@@ -235,24 +237,25 @@ fn is_none_or_err_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
 
 impl<'tcx> LateLintPass<'tcx> for OptionIfLetElse {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
-        // Don't lint macros, because it behaves weirdly
-        // and don't lint constant as well
-        if !expr.span.from_expansion() && !in_constant(cx, expr.hir_id) {
-            let detection = detect_option_if_let_else(cx, expr).or_else(|| detect_option_match(cx, expr));
-            if let Some(det) = detection {
-                span_lint_and_sugg(
-                    cx,
-                    OPTION_IF_LET_ELSE,
-                    expr.span,
-                    format!("use Option::{} instead of an if let/else", det.method_sugg).as_str(),
-                    "try",
-                    format!(
-                        "{}.{}({}, {})",
-                        det.option, det.method_sugg, det.none_expr, det.some_expr
-                    ),
-                    Applicability::MaybeIncorrect,
-                );
-            }
+        // Don't lint macros and constants
+        if expr.span.from_expansion() || in_constant(cx, expr.hir_id) {
+            return;
+        }
+
+        let detection = detect_option_if_let_else(cx, expr).or_else(|| detect_option_match(cx, expr));
+        if let Some(det) = detection {
+            span_lint_and_sugg(
+                cx,
+                OPTION_IF_LET_ELSE,
+                expr.span,
+                format!("use Option::{} instead of an if let/else", det.method_sugg).as_str(),
+                "try",
+                format!(
+                    "{}.{}({}, {})",
+                    det.option, det.method_sugg, det.none_expr, det.some_expr
+                ),
+                Applicability::MaybeIncorrect,
+            );
         }
     }
 }

tests/ui/option_if_let_else.stderr

@@ -207,7 +207,7 @@ LL ~     });
    |
 
 error: use Option::map_or instead of an if let/else
-  --> $DIR/option_if_let_else.rs:212:13
+  --> $DIR/option_if_let_else.rs:213:13
    |
 LL |       let _ = match s {
    |  _____________^
@@ -217,7 +217,7 @@ LL | |     };
    | |_____^ help: try: `s.map_or(1, |string| string.len())`
 
 error: use Option::map_or instead of an if let/else
-  --> $DIR/option_if_let_else.rs:216:13
+  --> $DIR/option_if_let_else.rs:217:13
    |
 LL |       let _ = match Some(10) {
    |  _____________^
@@ -227,7 +227,7 @@ LL | |     };
    | |_____^ help: try: `Some(10).map_or(5, |a| a + 1)`
 
 error: use Option::map_or instead of an if let/else
-  --> $DIR/option_if_let_else.rs:222:13
+  --> $DIR/option_if_let_else.rs:223:13
    |
 LL |       let _ = match res {
    |  _____________^
@@ -237,7 +237,7 @@ LL | |     };
    | |_____^ help: try: `res.map_or(1, |a| a + 1)`
 
 error: use Option::map_or instead of an if let/else
-  --> $DIR/option_if_let_else.rs:226:13
+  --> $DIR/option_if_let_else.rs:227:13
    |
 LL |       let _ = match res {
    |  _____________^
@@ -247,7 +247,7 @@ LL | |     };
    | |_____^ help: try: `res.map_or(1, |a| a + 1)`
 
 error: use Option::map_or instead of an if let/else
-  --> $DIR/option_if_let_else.rs:230:13
+  --> $DIR/option_if_let_else.rs:231:13
    |
 LL |     let _ = if let Ok(a) = res { a + 1 } else { 5 };
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `res.map_or(5, |a| a + 1)`