[clang][CodeComplete] Handle deref operator in getApproximateType (#86466)

This allows completing after `(*this).` in a dependent context.

Fixes https://github.com/clangd/clangd/issues/1952

1 files changed, 18 insertions, 2 deletions

diff --git a/clang/test/CodeCompletion/member-access.cpp b/clang/test/CodeCompletion/member-access.cpp
index 474b909ab115..9f8c21c0bca6 100644
--- a/clang/test/CodeCompletion/member-access.cpp
+++ b/clang/test/CodeCompletion/member-access.cpp
@@ -348,7 +348,23 @@ namespace function_can_be_call {
     T foo(U, V);
   };
 
-  &S::f
-  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:351:7 %s -o - | FileCheck -check-prefix=CHECK_FUNCTION_CAN_BE_CALL %s
+  void test() {
+    &S::f
+  }
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:352:9 %s -o - | FileCheck -check-prefix=CHECK_FUNCTION_CAN_BE_CALL %s
   // CHECK_FUNCTION_CAN_BE_CALL: COMPLETION: foo : [#T#]foo<<#typename T#>, <#typename U#>>(<#U#>, <#V#>)
 }
+
+namespace deref_dependent_this {
+template <typename T>
+class A {
+  int field;
+
+  void function() {
+    (*this).field;
+// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:364:13 %s -o - | FileCheck -check-prefix=CHECK-DEREF-THIS %s
+// CHECK-DEREF-THIS: field : [#int#]field
+// CHECK-DEREF-THIS: [#void#]function()
+  }
+};
+}