carbon-lang/toolchain/check/testdata/class/fail_derived_to_base.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
//
// AUTOUPDATE

base class A1 {
  var a: i32;
}

base class A2 {
  var a: i32;
}

class B2 {
  extend base: A2;
  var b: i32;
}

// CHECK:STDERR: fail_derived_to_base.carbon:[[@LINE+3]]:38: ERROR: Cannot implicitly convert from `B2*` to `A1*`.
// CHECK:STDERR: fn ConvertUnrelated(p: B2*) -> A1* { return p; }
// CHECK:STDERR:                                      ^~~~~~~~~
fn ConvertUnrelated(p: B2*) -> A1* { return p; }

class Incomplete;

// CHECK:STDERR: fail_derived_to_base.carbon:[[@LINE+3]]:47: ERROR: Cannot implicitly convert from `Incomplete*` to `A2*`.
// CHECK:STDERR: fn ConvertIncomplete(p: Incomplete*) -> A2* { return p; }
// CHECK:STDERR:                                               ^~~~~~~~~
fn ConvertIncomplete(p: Incomplete*) -> A2* { return p; }

// CHECK:STDOUT: --- fail_derived_to_base.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %.loc9: type = struct_type {.a: i32}
// CHECK:STDOUT:   %.loc11: type = ptr_type {.a: i32}
// CHECK:STDOUT:   %.loc18_1.1: type = struct_type {.base: A2, .b: i32}
// CHECK:STDOUT:   %.loc18_1.2: type = struct_type {.base: {.a: i32}*, .b: i32}
// CHECK:STDOUT:   %.loc18_1.3: type = ptr_type {.base: {.a: i32}*, .b: i32}
// CHECK:STDOUT:   %.loc15: type = ptr_type {.base: A2, .b: i32}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace {.A1 = %A1.decl, .A2 = %A2.decl, .B2 = %B2.decl, .ConvertUnrelated = %ConvertUnrelated, .Incomplete = %Incomplete.decl, .ConvertIncomplete = %ConvertIncomplete}
// CHECK:STDOUT:   %A1.decl = class_decl @A1, ()
// CHECK:STDOUT:   %A1: type = class_type @A1
// CHECK:STDOUT:   %A2.decl = class_decl @A2, ()
// CHECK:STDOUT:   %A2: type = class_type @A2
// CHECK:STDOUT:   %B2.decl = class_decl @B2, ()
// CHECK:STDOUT:   %B2: type = class_type @B2
// CHECK:STDOUT:   %ConvertUnrelated: <function> = fn_decl @ConvertUnrelated
// CHECK:STDOUT:   %Incomplete.decl = class_decl @Incomplete, ()
// CHECK:STDOUT:   %Incomplete: type = class_type @Incomplete
// CHECK:STDOUT:   %ConvertIncomplete: <function> = fn_decl @ConvertIncomplete
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @A1 {
// CHECK:STDOUT:   %.loc8_8.1: type = unbound_element_type A1, i32
// CHECK:STDOUT:   %.loc8_8.2: <unbound element of class A1> = field_decl a, element0
// CHECK:STDOUT:   %a: <unbound element of class A1> = bind_name a, %.loc8_8.2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .a = %a
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @A2 {
// CHECK:STDOUT:   %.loc12_8.1: type = unbound_element_type A2, i32
// CHECK:STDOUT:   %.loc12_8.2: <unbound element of class A2> = field_decl a, element0
// CHECK:STDOUT:   %a: <unbound element of class A2> = bind_name a, %.loc12_8.2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .a = %a
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B2 {
// CHECK:STDOUT:   %A2.ref: type = name_ref A2, file.%A2
// CHECK:STDOUT:   %.loc16_18.1: type = unbound_element_type B2, A2
// CHECK:STDOUT:   %.loc16_18.2: <unbound element of class B2> = base_decl A2, element0
// CHECK:STDOUT:   %.loc17_8.1: type = unbound_element_type B2, i32
// CHECK:STDOUT:   %.loc17_8.2: <unbound element of class B2> = field_decl b, element1
// CHECK:STDOUT:   %b: <unbound element of class B2> = bind_name b, %.loc17_8.2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT:   .base = %.loc16_18.2
// CHECK:STDOUT:   .b = %b
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ConvertUnrelated(%p: B2*) -> A1* {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %p.ref: B2* = name_ref p, %p
// CHECK:STDOUT:   return <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ConvertIncomplete(%p: Incomplete*) -> A2* {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %p.ref: Incomplete* = name_ref p, %p
// CHECK:STDOUT:   return <error>
// CHECK:STDOUT: }
// CHECK:STDOUT: