// 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/destroy.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/fail_abstract.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/fail_abstract.carbon

// --- fail_abstract_field.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

class Contains {
  // CHECK:STDERR: fail_abstract_field.carbon:[[@LINE+7]]:10: error: field has abstract type `Abstract` [AbstractTypeInFieldDecl]
  // CHECK:STDERR:   var a: Abstract;
  // CHECK:STDERR:          ^~~~~~~~
  // CHECK:STDERR: fail_abstract_field.carbon:[[@LINE-7]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  var a: Abstract;
}

// --- fail_abstract_var.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

fn Var() {
  // CHECK:STDERR: fail_abstract_var.carbon:[[@LINE+7]]:10: error: binding pattern has abstract type `Abstract` in `var` pattern [AbstractTypeInVarPattern]
  // CHECK:STDERR:   var v: Abstract;
  // CHECK:STDERR:          ^~~~~~~~
  // CHECK:STDERR: fail_abstract_var.carbon:[[@LINE-7]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  var v: Abstract;
}

// --- abstract_let.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

fn F(a: Abstract) {
  let l: Abstract = a;
}

// --- fail_abstract_adapter.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

class Adapter {
  // TODO(#4387): This should probably be valid
  // CHECK:STDERR: fail_abstract_adapter.carbon:[[@LINE+7]]:3: error: adapted type `Abstract` is an abstract type [AbstractTypeInAdaptDecl]
  // CHECK:STDERR:   adapt Abstract;
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_abstract_adapter.carbon:[[@LINE-8]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  adapt Abstract;
}

// --- define_and_call_abstract_param.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

fn Param(a: Abstract);

fn Call(p: Abstract) {
  Param(p);
}

// --- fail_todo_return_nonabstract_derived.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

class Derived {
  extend base: Abstract;

  var d: {};
}

fn Make() -> Derived {
  // TODO: This should be valid, and should construct an instance of `partial Abstract` as the base.
  // CHECK:STDERR: fail_todo_return_nonabstract_derived.carbon:[[@LINE+7]]:10: error: initialization of abstract type `Abstract` [AbstractTypeInInit]
  // CHECK:STDERR:   return {.base = {}, .d = {}};
  // CHECK:STDERR:          ^~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_todo_return_nonabstract_derived.carbon:[[@LINE-14]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  return {.base = {}, .d = {}};
}

// --- fail_return_abstract.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

class Derived {
  extend base: Abstract;

  var d: {};
}

fn Return(a: Abstract) -> Abstract {
  // TODO: Seems like this would be better off failing with "function returns abstract type" here instead of this \/
  // CHECK:STDERR: fail_return_abstract.carbon:[[@LINE+7]]:3: error: initialization of abstract type `Abstract` [AbstractTypeInInit]
  // CHECK:STDERR:   return a;
  // CHECK:STDERR:   ^~~~~~~~~
  // CHECK:STDERR: fail_return_abstract.carbon:[[@LINE-14]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR:
  return a;
}

// --- access_abstract_subobject.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
  var a: {};
}

class Derived {
  extend base: Abstract;

  var d: {};
}

fn Access(d: Derived) -> {} {
  return d.base.a;
}

// --- abstract_let_temporary.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

fn F() {
  let l: Abstract = {};
}

// --- fail_call_abstract_return.carbon

library "[[@TEST_NAME]]";

abstract class Abstract {
}

fn ReturnAbstract() -> Abstract;

fn CallReturnAbstract() {
  // CHECK:STDERR: fail_call_abstract_return.carbon:[[@LINE+10]]:3: error: function returns abstract type `Abstract` [AbstractTypeInFunctionReturnType]
  // CHECK:STDERR:   ReturnAbstract();
  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_call_abstract_return.carbon:[[@LINE-9]]:1: note: class was declared abstract here [ClassAbstractHere]
  // CHECK:STDERR: abstract class Abstract {
  // CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
  // CHECK:STDERR: fail_call_abstract_return.carbon:[[@LINE-9]]:21: note: return type declared here [IncompleteReturnTypeHere]
  // CHECK:STDERR: fn ReturnAbstract() -> Abstract;
  // CHECK:STDERR:                     ^~~~~~~~~~~
  // CHECK:STDERR:
  ReturnAbstract();
}

// CHECK:STDOUT: --- fail_abstract_field.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %Contains: type = class_type @Contains [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Contains = %Contains.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Contains.decl: type = class_decl @Contains [concrete = constants.%Contains] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Contains {
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %.loc15: <error> = field_decl a, element0 [concrete]
// CHECK:STDOUT:   %struct_type.a: type = struct_type {.a: <error>} [concrete = <error>]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [concrete = <error>]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Contains
// CHECK:STDOUT:   .Abstract = <poisoned>
// CHECK:STDOUT:   .a = %.loc15
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_abstract_var.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %Var.type: type = fn_type @Var [concrete]
// CHECK:STDOUT:   %Var: %Var.type = struct_value () [concrete]
// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     .Destroy = %Core.Destroy
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Var = %Var.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Var.decl: %Var.type = fn_decl @Var [concrete = constants.%Var] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Var() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %v.patt: <error> = binding_pattern v [concrete]
// CHECK:STDOUT:     %v.var_patt: <error> = var_pattern %v.patt [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %v.var: ref <error> = var %v.var_patt [concrete = <error>]
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %v: <error> = bind_name v, <error> [concrete = <error>]
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- abstract_let.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Abstract [concrete]
// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT:     %a.patt: %pattern_type = binding_pattern a [concrete]
// CHECK:STDOUT:     %a.param_patt: %pattern_type = value_param_pattern %a.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %a.param: %Abstract = value_param call_param0
// CHECK:STDOUT:     %Abstract.ref.loc7: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %a: %Abstract = bind_name a, %a.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%a.param: %Abstract) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %l.patt: %pattern_type = binding_pattern l [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %a.ref: %Abstract = name_ref a, %a
// CHECK:STDOUT:   %Abstract.ref.loc8: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %l: %Abstract = bind_name l, <error> [concrete = <error>]
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_abstract_adapter.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %Adapter: type = class_type @Adapter [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Adapter = %Adapter.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Adapter.decl: type = class_decl @Adapter [concrete = constants.%Adapter] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Adapter {
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   adapt_decl <error> [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [concrete = <error>]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Adapter
// CHECK:STDOUT:   .Abstract = <poisoned>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- define_and_call_abstract_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Abstract [concrete]
// CHECK:STDOUT:   %Param.type: type = fn_type @Param [concrete]
// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT:   %Param: %Param.type = struct_value () [concrete]
// CHECK:STDOUT:   %Call.type: type = fn_type @Call [concrete]
// CHECK:STDOUT:   %Call: %Call.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Param = %Param.decl
// CHECK:STDOUT:     .Call = %Call.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Param.decl: %Param.type = fn_decl @Param [concrete = constants.%Param] {
// CHECK:STDOUT:     %a.patt: %pattern_type = binding_pattern a [concrete]
// CHECK:STDOUT:     %a.param_patt: %pattern_type = value_param_pattern %a.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %a.param: %Abstract = value_param call_param0
// CHECK:STDOUT:     %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %a: %Abstract = bind_name a, %a.param
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Call.decl: %Call.type = fn_decl @Call [concrete = constants.%Call] {
// CHECK:STDOUT:     %p.patt: %pattern_type = binding_pattern p [concrete]
// CHECK:STDOUT:     %p.param_patt: %pattern_type = value_param_pattern %p.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %p.param: %Abstract = value_param call_param0
// CHECK:STDOUT:     %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %p: %Abstract = bind_name p, %p.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Param(%a.param: %Abstract);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Call(%p.param: %Abstract) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %Param.ref: %Param.type = name_ref Param, file.%Param.decl [concrete = constants.%Param]
// CHECK:STDOUT:   %p.ref: %Abstract = name_ref p, %p
// CHECK:STDOUT:   %Param.call: init %empty_tuple.type = call %Param.ref(<error>)
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_return_nonabstract_derived.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
// CHECK:STDOUT:   %Derived.elem.513: type = unbound_element_type %Derived, %Abstract [concrete]
// CHECK:STDOUT:   %Derived.elem.ad9: type = unbound_element_type %Derived, %empty_struct_type [concrete]
// CHECK:STDOUT:   %struct_type.base.d.c06: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete]
// CHECK:STDOUT:   %complete_type.b4a: <witness> = complete_type_witness %struct_type.base.d.c06 [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Derived [concrete]
// CHECK:STDOUT:   %Make.type: type = fn_type @Make [concrete]
// CHECK:STDOUT:   %Make: %Make.type = struct_value () [concrete]
// CHECK:STDOUT:   %struct_type.base.d.e0f: type = struct_type {.base: %empty_struct_type, .d: %empty_struct_type} [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Derived = %Derived.decl
// CHECK:STDOUT:     .Make = %Make.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Derived.decl: type = class_decl @Derived [concrete = constants.%Derived] {} {}
// CHECK:STDOUT:   %Make.decl: %Make.type = fn_decl @Make [concrete = constants.%Make] {
// CHECK:STDOUT:     %return.patt: %pattern_type = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type = out_param_pattern %return.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Derived.ref: type = name_ref Derived, file.%Derived.decl [concrete = constants.%Derived]
// CHECK:STDOUT:     %return.param: ref %Derived = out_param call_param0
// CHECK:STDOUT:     %return: ref %Derived = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Derived {
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %.loc8: %Derived.elem.513 = base_decl %Abstract.ref, element0 [concrete]
// CHECK:STDOUT:   %.loc10_11.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc10_11.2: type = converted %.loc10_11.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %.loc10_8: %Derived.elem.ad9 = field_decl d, element1 [concrete]
// CHECK:STDOUT:   %struct_type.base.d: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete = constants.%struct_type.base.d.c06]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d [concrete = constants.%complete_type.b4a]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Derived
// CHECK:STDOUT:   .Abstract = <poisoned>
// CHECK:STDOUT:   .base = %.loc8
// CHECK:STDOUT:   .d = %.loc10_8
// CHECK:STDOUT:   extend %Abstract.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Make() -> %return.param: %Derived {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %.loc22_20: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc22_29: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc22_30: %struct_type.base.d.e0f = struct_literal (%.loc22_20, %.loc22_29)
// CHECK:STDOUT:   return <error> to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_return_abstract.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
// CHECK:STDOUT:   %Derived.elem.513: type = unbound_element_type %Derived, %Abstract [concrete]
// CHECK:STDOUT:   %Derived.elem.ad9: type = unbound_element_type %Derived, %empty_struct_type [concrete]
// CHECK:STDOUT:   %struct_type.base.d: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete]
// CHECK:STDOUT:   %complete_type.b4a: <witness> = complete_type_witness %struct_type.base.d [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Abstract [concrete]
// CHECK:STDOUT:   %Return.type: type = fn_type @Return [concrete]
// CHECK:STDOUT:   %Return: %Return.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Derived = %Derived.decl
// CHECK:STDOUT:     .Return = %Return.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Derived.decl: type = class_decl @Derived [concrete = constants.%Derived] {} {}
// CHECK:STDOUT:   %Return.decl: %Return.type = fn_decl @Return [concrete = constants.%Return] {
// CHECK:STDOUT:     %a.patt: %pattern_type = binding_pattern a [concrete]
// CHECK:STDOUT:     %a.param_patt: %pattern_type = value_param_pattern %a.patt, call_param0 [concrete]
// CHECK:STDOUT:     %return.patt: %pattern_type = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type = out_param_pattern %return.patt, call_param1 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Abstract.ref.loc13_27: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %a.param: %Abstract = value_param call_param0
// CHECK:STDOUT:     %Abstract.ref.loc13_14: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %a: %Abstract = bind_name a, %a.param
// CHECK:STDOUT:     %return.param: ref %Abstract = out_param call_param1
// CHECK:STDOUT:     %return: ref %Abstract = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Derived {
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %.loc8: %Derived.elem.513 = base_decl %Abstract.ref, element0 [concrete]
// CHECK:STDOUT:   %.loc10_11.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc10_11.2: type = converted %.loc10_11.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %.loc10_8: %Derived.elem.ad9 = field_decl d, element1 [concrete]
// CHECK:STDOUT:   %struct_type.base.d: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete = constants.%struct_type.base.d]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d [concrete = constants.%complete_type.b4a]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Derived
// CHECK:STDOUT:   .Abstract = <poisoned>
// CHECK:STDOUT:   .base = %.loc8
// CHECK:STDOUT:   .d = %.loc10_8
// CHECK:STDOUT:   extend %Abstract.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Return(%a.param: %Abstract) -> %return.param: %Abstract {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %a.ref: %Abstract = name_ref a, %a
// CHECK:STDOUT:   return <error> to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- access_abstract_subobject.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %Abstract.elem: type = unbound_element_type %Abstract, %empty_struct_type [concrete]
// CHECK:STDOUT:   %struct_type.a.225: type = struct_type {.a: %empty_struct_type} [concrete]
// CHECK:STDOUT:   %complete_type.8c6: <witness> = complete_type_witness %struct_type.a.225 [concrete]
// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
// CHECK:STDOUT:   %Derived.elem.513: type = unbound_element_type %Derived, %Abstract [concrete]
// CHECK:STDOUT:   %Derived.elem.ad9: type = unbound_element_type %Derived, %empty_struct_type [concrete]
// CHECK:STDOUT:   %struct_type.base.d.c06: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete]
// CHECK:STDOUT:   %complete_type.b4a: <witness> = complete_type_witness %struct_type.base.d.c06 [concrete]
// CHECK:STDOUT:   %pattern_type.fb9: type = pattern_type %Derived [concrete]
// CHECK:STDOUT:   %pattern_type.a96: type = pattern_type %empty_struct_type [concrete]
// CHECK:STDOUT:   %Access.type: type = fn_type @Access [concrete]
// CHECK:STDOUT:   %Access: %Access.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .Derived = %Derived.decl
// CHECK:STDOUT:     .Access = %Access.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %Derived.decl: type = class_decl @Derived [concrete = constants.%Derived] {} {}
// CHECK:STDOUT:   %Access.decl: %Access.type = fn_decl @Access [concrete = constants.%Access] {
// CHECK:STDOUT:     %d.patt: %pattern_type.fb9 = binding_pattern d [concrete]
// CHECK:STDOUT:     %d.param_patt: %pattern_type.fb9 = value_param_pattern %d.patt, call_param0 [concrete]
// CHECK:STDOUT:     %return.patt: %pattern_type.a96 = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type.a96 = out_param_pattern %return.patt, call_param1 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %.loc14_27.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:     %.loc14_27.2: type = converted %.loc14_27.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:     %d.param: %Derived = value_param call_param0
// CHECK:STDOUT:     %Derived.ref: type = name_ref Derived, file.%Derived.decl [concrete = constants.%Derived]
// CHECK:STDOUT:     %d: %Derived = bind_name d, %d.param
// CHECK:STDOUT:     %return.param: ref %empty_struct_type = out_param call_param1
// CHECK:STDOUT:     %return: ref %empty_struct_type = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %.loc5_11.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc5_11.2: type = converted %.loc5_11.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %.loc5_8: %Abstract.elem = field_decl a, element0 [concrete]
// CHECK:STDOUT:   %struct_type.a: type = struct_type {.a: %empty_struct_type} [concrete = constants.%struct_type.a.225]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [concrete = constants.%complete_type.8c6]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT:   .a = %.loc5_8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Derived {
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %.loc9: %Derived.elem.513 = base_decl %Abstract.ref, element0 [concrete]
// CHECK:STDOUT:   %.loc11_11.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %.loc11_11.2: type = converted %.loc11_11.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %.loc11_8: %Derived.elem.ad9 = field_decl d, element1 [concrete]
// CHECK:STDOUT:   %struct_type.base.d: type = struct_type {.base: %Abstract, .d: %empty_struct_type} [concrete = constants.%struct_type.base.d.c06]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d [concrete = constants.%complete_type.b4a]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Derived
// CHECK:STDOUT:   .Abstract = <poisoned>
// CHECK:STDOUT:   .base = %.loc9
// CHECK:STDOUT:   .d = %.loc11_8
// CHECK:STDOUT:   extend %Abstract.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Access(%d.param: %Derived) -> %empty_struct_type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %d.ref: %Derived = name_ref d, %d
// CHECK:STDOUT:   %base.ref: %Derived.elem.513 = name_ref base, @Derived.%.loc9 [concrete = @Derived.%.loc9]
// CHECK:STDOUT:   %.loc15: ref %Abstract = class_element_access %d.ref, element0
// CHECK:STDOUT:   %a.ref: <error> = name_ref a, <error> [concrete = <error>]
// CHECK:STDOUT:   return <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- abstract_let_temporary.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Abstract [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %l.patt: %pattern_type = binding_pattern l [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %.loc8: %empty_struct_type = struct_literal ()
// CHECK:STDOUT:   %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:   %l: %Abstract = bind_name l, <error> [concrete = <error>]
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_call_abstract_return.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Abstract: type = class_type @Abstract [concrete]
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT:   %pattern_type: type = pattern_type %Abstract [concrete]
// CHECK:STDOUT:   %ReturnAbstract.type: type = fn_type @ReturnAbstract [concrete]
// CHECK:STDOUT:   %ReturnAbstract: %ReturnAbstract.type = struct_value () [concrete]
// CHECK:STDOUT:   %CallReturnAbstract.type: type = fn_type @CallReturnAbstract [concrete]
// CHECK:STDOUT:   %CallReturnAbstract: %CallReturnAbstract.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .Abstract = %Abstract.decl
// CHECK:STDOUT:     .ReturnAbstract = %ReturnAbstract.decl
// CHECK:STDOUT:     .CallReturnAbstract = %CallReturnAbstract.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %Abstract.decl: type = class_decl @Abstract [concrete = constants.%Abstract] {} {}
// CHECK:STDOUT:   %ReturnAbstract.decl: %ReturnAbstract.type = fn_decl @ReturnAbstract [concrete = constants.%ReturnAbstract] {
// CHECK:STDOUT:     %return.patt: %pattern_type = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type = out_param_pattern %return.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Abstract.ref: type = name_ref Abstract, file.%Abstract.decl [concrete = constants.%Abstract]
// CHECK:STDOUT:     %return.param: ref %Abstract = out_param call_param0
// CHECK:STDOUT:     %return: ref %Abstract = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %CallReturnAbstract.decl: %CallReturnAbstract.type = fn_decl @CallReturnAbstract [concrete = constants.%CallReturnAbstract] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Abstract {
// CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT:   complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .Self = constants.%Abstract
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ReturnAbstract() -> %return.param: %Abstract;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CallReturnAbstract() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %ReturnAbstract.ref: %ReturnAbstract.type = name_ref ReturnAbstract, file.%ReturnAbstract.decl [concrete = constants.%ReturnAbstract]
// CHECK:STDOUT:   %ReturnAbstract.call: init <error> = call %ReturnAbstract.ref()
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT: