carbon-lang/toolchain/check/testdata/class/fail_extend_cycle.carbon

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/fail_extend_cycle.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/fail_extend_cycle.carbon

base class A {
}

base class B {
  // This ensures that the compiler treats A as complete.
  extend base: A;
}

// CHECK:STDERR: fail_extend_cycle.carbon:[[@LINE+7]]:1: error: redefinition of `class A` [RedeclRedef]
// CHECK:STDERR: base class A {
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR: fail_extend_cycle.carbon:[[@LINE-11]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: base class A {
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
base class A {
  extend base: A;
  // CHECK:STDERR: fail_extend_cycle.carbon:[[@LINE+4]]:10: error: name `C` not found [NameNotFound]
  // CHECK:STDERR:   var c: C;
  // CHECK:STDERR:          ^
  // CHECK:STDERR:
  var c: C;
}