Merge pull request #33072 from rintaro/ide-index-test-explicitcast

[Test] Add indexing test cases for ExplicitCastExpr

Author: rintaro

test/Index/expressions.swift

@@ -1,5 +1,6 @@
 // RUN: %target-swift-ide-test -print-indexed-symbols -source-filename %s | %FileCheck %s
 
+// CHECK: [[@LINE+1]]:10 | protocol/Swift | P1 | [[P1_USR:.*]] | Def
 protocol P1 {}
 
 // CHECK: [[@LINE+1]]:8 | struct/Swift | S1 | [[S1_USR:.*]] | Def
@@ -76,3 +77,13 @@ func useDisposable(_ d: Disposable?) {
   guard let dispose = d?.dispose else { return }
   _ = dispose
 }
+
+func castExpr(x: Any) {
+    // CHECK: [[@LINE+2]]:9 | struct/Swift | S1 | [[S1_USR]] | Ref
+    // CHECK: [[@LINE+1]]:17 | protocol/Swift | P1 | [[P1_USR]] | Ref
+    _ = S1() as P1
+    // CHECK: [[@LINE+1]]:15 | struct/Swift | S1 | [[S1_USR]] | Ref
+    _ = x as! S1
+    // CHECK: [[@LINE+1]]:15 | struct/Swift | S1 | [[S1_USR]] | Ref
+    _ = x as? S1
+}