fix: option_if_let_else keep deref op if the inner expr is a raw pointer

closes rust-clippy/issues/15379

Signed-off-by: Zihan <zihanli0822@gmail.com>

Author: zihan0822

clippy_lints/src/option_if_let_else.rs

@@ -127,7 +127,8 @@ fn try_get_option_occurrence<'tcx>(
     if_else: &'tcx Expr<'_>,
 ) -> Option<OptionOccurrence> {
     let cond_expr = match expr.kind {
-        ExprKind::Unary(UnOp::Deref, inner_expr) | ExprKind::AddrOf(_, _, inner_expr) => inner_expr,
+        ExprKind::AddrOf(_, _, inner_expr) => inner_expr,
+        ExprKind::Unary(UnOp::Deref, inner_expr) if !cx.typeck_results().expr_ty(inner_expr).is_raw_ptr() => inner_expr,
         _ => expr,
     };
     let (inner_pat, is_result) = try_get_inner_pat_and_is_result(cx, pat)?;

tests/ui/option_if_let_else.fixed

@@ -302,3 +302,10 @@ mod issue11059 {
         if let Some(o) = o { o } else { &S }
     }
 }
+
+fn issue15379() {
+    let opt = Some(0usize);
+    let opt_raw_ptr = &opt as *const Option<usize>;
+    let _ = unsafe { (*opt_raw_ptr).map_or(1, |o| o) };
+    //~^ option_if_let_else
+}

tests/ui/option_if_let_else.rs

@@ -365,3 +365,10 @@ mod issue11059 {
         if let Some(o) = o { o } else { &S }
     }
 }
+
+fn issue15379() {
+    let opt = Some(0usize);
+    let opt_raw_ptr = &opt as *const Option<usize>;
+    let _ = unsafe { if let Some(o) = *opt_raw_ptr { o } else { 1 } };
+    //~^ option_if_let_else
+}

tests/ui/option_if_let_else.stderr

@@ -334,5 +334,11 @@ error: use Option::map_or_else instead of an if let/else
 LL |     let mut _hm = if let Some(hm) = &opt { hm.clone() } else { new_map!() };
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `opt.as_ref().map_or_else(|| new_map!(), |hm| hm.clone())`
 
-error: aborting due to 25 previous errors
+error: use Option::map_or instead of an if let/else
+  --> tests/ui/option_if_let_else.rs:372:22
+   |
+LL |     let _ = unsafe { if let Some(o) = *opt_raw_ptr { o } else { 1 } };
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*opt_raw_ptr).map_or(1, |o| o)`
+
+error: aborting due to 26 previous errors