// 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
//
// AUTOUPDATE

base class B1 {}
base class B2 {}

class C {
  extend base: B1;
  // CHECK:STDERR: fail_base_repeated.carbon:[[@LINE+7]]:3: ERROR: Multiple `base` declarations in class. Multiple inheritance is not permitted.
  // CHECK:STDERR:   extend base: B2;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_base_repeated.carbon:[[@LINE-4]]:3: Previous `base` declaration is here.
  // CHECK:STDERR:   extend base: B1;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  extend base: B2;
}

class D {
  // TODO: Consider adding a custom diagnostic for this case.
  extend base: B1;
  // CHECK:STDERR: fail_base_repeated.carbon:[[@LINE+6]]:3: ERROR: Multiple `base` declarations in class. Multiple inheritance is not permitted.
  // CHECK:STDERR:   extend base: B1;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_base_repeated.carbon:[[@LINE-4]]:3: Previous `base` declaration is here.
  // CHECK:STDERR:   extend base: B1;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
  extend base: B1;
}

// CHECK:STDOUT: --- fail_base_repeated.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %B1: type = class_type @B1 [template]
// CHECK:STDOUT:   %.1: type = struct_type {} [template]
// CHECK:STDOUT:   %B2: type = class_type @B2 [template]
// CHECK:STDOUT:   %C: type = class_type @C [template]
// CHECK:STDOUT:   %.2: type = tuple_type () [template]
// CHECK:STDOUT:   %.3: type = ptr_type {} [template]
// CHECK:STDOUT:   %.4: type = unbound_element_type C, B1 [template]
// CHECK:STDOUT:   %.5: type = struct_type {.base: B1} [template]
// CHECK:STDOUT:   %D: type = class_type @D [template]
// CHECK:STDOUT:   %.6: type = unbound_element_type D, B1 [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .B1 = %B1.decl
// CHECK:STDOUT:     .B2 = %B2.decl
// CHECK:STDOUT:     .C = %C.decl
// CHECK:STDOUT:     .D = %D.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %B1.decl: type = class_decl @B1 [template = constants.%B1] {}
// CHECK:STDOUT:   %B2.decl: type = class_decl @B2 [template = constants.%B2] {}
// CHECK:STDOUT:   %C.decl: type = class_decl @C [template = constants.%C] {}
// CHECK:STDOUT:   %D.decl: type = class_decl @D [template = constants.%D] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B1 {
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%B1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B2 {
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%B2
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT:   %B1.ref: type = name_ref B1, file.%B1.decl [template = constants.%B1]
// CHECK:STDOUT:   %.loc11: <unbound element of class C> = base_decl B1, element0 [template]
// CHECK:STDOUT:   %B2.ref: type = name_ref B2, file.%B2.decl [template = constants.%B2]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%C
// CHECK:STDOUT:   .base = %.loc11
// CHECK:STDOUT:   extend name_scope1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @D {
// CHECK:STDOUT:   %B1.ref.loc24: type = name_ref B1, file.%B1.decl [template = constants.%B1]
// CHECK:STDOUT:   %.loc24: <unbound element of class D> = base_decl B1, element0 [template]
// CHECK:STDOUT:   %B1.ref.loc31: type = name_ref B1, file.%B1.decl [template = constants.%B1]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%D
// CHECK:STDOUT:   .base = %.loc24
// CHECK:STDOUT:   extend name_scope1
// CHECK:STDOUT: }
// CHECK:STDOUT: