Merge pull request #21935 from ChayimFriedman2/array-elem-cfg

fix: Support cfg-ing array elements

Author: ShoyuVanilla

crates/hir-def/src/expr_store/lower.rs

@@ -1465,7 +1465,15 @@ impl<'db> ExprCollector<'db> {
 
                 match kind {
                     ArrayExprKind::ElementList(e) => {
-                        let elements = e.map(|expr| self.collect_expr(expr)).collect();
+                        let elements = e
+                            .filter_map(|expr| {
+                                if self.check_cfg(&expr) {
+                                    Some(self.collect_expr(expr))
+                                } else {
+                                    None
+                                }
+                            })
+                            .collect();
                         self.alloc_expr(Expr::Array(Array::ElementList { elements }), syntax_ptr)
                     }
                     ArrayExprKind::Repeat { initializer, repeat } => {

crates/hir-def/src/expr_store/tests/body.rs

@@ -660,3 +660,24 @@ async fn main(&self, param1: i32, ref mut param2: i32, _: i32, param4 @ _: i32,
         }"#]],
     )
 }
+
+#[test]
+fn array_element_cfg() {
+    pretty_print(
+        r#"
+fn foo() {
+    [
+        (),
+        #[cfg(false)]
+        ()
+    ];
+}
+    "#,
+        expect![[r#"
+        fn foo() {
+            [
+                (),
+            ];
+        }"#]],
+    );
+}