llvm-project/clang/test/SemaCXX/this.cpp

// RUN: clang -fsyntax-only -verify %s 
int x = this; // expected-error {{error: invalid use of 'this' outside of a nonstatic member function}}

void f() {
  int x = this; // expected-error {{error: invalid use of 'this' outside of a nonstatic member function}}
}