clang/test/CXX/expr/expr.prim/expr.prim.lambda/p8.cpp

// RUN: %clang_cc1 -std=c++11 %s -verify

class X0 {
  void explicit_capture() {
    int foo;

    (void)[foo, foo] () {}; // expected-error {{'foo' can appear only once}}
    (void)[this, this] () {}; // expected-error {{'this' can appear only once}}
    (void)[=, foo] () {}; // expected-error {{'&' must precede a capture when}}
    (void)[=, &foo] () {};
    (void)[=, this] () {}; // expected-error {{'this' cannot appear}}
    (void)[&, foo] () {};
    (void)[&, &foo] () {}; // expected-error {{'&' cannot precede a capture when}} 
    (void)[&, this] () {};
  }
};