feat: support inlay hint for more expr with label

Author: Young-Flash

src/tools/rust-analyzer/crates/ide/src/inlay_hints/closing_brace.rs

@@ -7,7 +7,7 @@ use hir::{HirDisplay, Semantics};
 use ide_db::{FileRange, RootDatabase};
 use span::EditionedFileId;
 use syntax::{
-    ast::{self, AstNode, HasName},
+    ast::{self, AstNode, HasLoopBody, HasName},
     match_ast, SyntaxKind, SyntaxNode, T,
 };
 
@@ -57,9 +57,30 @@ pub(super) fn hints(
         // the actual number of lines in this case should be the line count of the parent BlockExpr,
         // which the `min_lines` config cares about
         node = node.parent()?;
-        let block = label.syntax().parent().and_then(ast::BlockExpr::cast)?;
-        closing_token = block.stmt_list()?.r_curly_token()?;
+
+        let parent = label.syntax().parent()?;
+        let block;
+        match_ast! {
+            match parent {
+                ast::BlockExpr(block_expr) => {
+                    block = block_expr.stmt_list()?;
+                },
+                ast::LoopExpr(loop_expr) => {
+                    block = loop_expr.loop_body()?.stmt_list()?;
+                },
+                ast::WhileExpr(while_expr) => {
+                    block = while_expr.loop_body()?.stmt_list()?;
+                },
+                ast::ForExpr(for_expr) => {
+                    block = for_expr.loop_body()?.stmt_list()?;
+                },
+                _ => return None,
+            }
+        }
+        closing_token = block.r_curly_token()?;
+
         let lifetime = label.lifetime().map_or_else(String::new, |it| it.to_string());
+
         (lifetime, Some(label.syntax().text_range()))
     } else if let Some(block) = ast::BlockExpr::cast(node.clone()) {
         closing_token = block.stmt_list()?.r_curly_token()?;