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carbon-lang/toolchain/check/testdata/class/fail_redeclaration_introducer.carbon
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Jon Ross-Perkins db324c7247 Initial, extern-ignoring support for extern class decls. (#3891) 
This doesn't actually track whether a declaration is `extern`. It does,
however:

- Factor out and expand merge support for classes, sharing handling with
functions.
- This makes the ClassRedefinition diagnostic redundant, as the
redeclaration checking overlaps.
- Add partial `extern` handling to class handling; just some
verifications of correct use.
- Factor out `extern` on member handling for sharing with `fn`.
- Fixes a bug in import_ref where a class's definition_id wasn't
assigned when defining.

This changes how a redefinition is handled (replaced, rather than
merged). I don't know whether that's ideal, but I think it results in
easy-to-understand consequences, and it's more consistent with how `fn`
works.

There's enough work here that this felt like a decent cut point,
particularly as the amount of work to actually add `extern` tracking
will be significant.
2024-04-19 16:08:29 +00:00

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// 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
// --- fail_add_base.carbon
library "fail_add_base" api;
class A;
// CHECK:STDERR: fail_add_base.carbon:[[@LINE+7]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: base class A {}
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR: fail_add_base.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: class A;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
base class A {}
// --- fail_add_abstract.carbon
library "fail_add_abstract" api;
class B;
// CHECK:STDERR: fail_add_abstract.carbon:[[@LINE+7]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: abstract class B {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_add_abstract.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: class B;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
abstract class B {}
// --- fail_remove_base.carbon
library "fail_remove_base" api;
base class C;
// CHECK:STDERR: fail_remove_base.carbon:[[@LINE+7]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: class C {}
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR: fail_remove_base.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: base class C;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
class C {}
// --- fail_base_to_abstract.carbon
library "fail_base_to_abstract" api;
base class D;
// CHECK:STDERR: fail_base_to_abstract.carbon:[[@LINE+7]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: abstract class D {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_base_to_abstract.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: base class D;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
abstract class D {}
// --- fail_remove_abstract.carbon
library "fail_remove_abstract" api;
abstract class E;
// CHECK:STDERR: fail_remove_abstract.carbon:[[@LINE+7]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: class E {}
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR: fail_remove_abstract.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: abstract class E;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
class E {}
// --- fail_abstract_to_base.carbon
library "fail_abstract_to_base" api;
abstract class F;
// CHECK:STDERR: fail_abstract_to_base.carbon:[[@LINE+6]]:1: ERROR: Class redeclared with different inheritance kind.
// CHECK:STDERR: base class F {}
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR: fail_abstract_to_base.carbon:[[@LINE-4]]:1: Previously declared here.
// CHECK:STDERR: abstract class F;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
base class F {}
// CHECK:STDOUT: --- fail_add_base.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A: type = class_type @A [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .A = %A.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %A.decl.loc4: type = class_decl @A [template = constants.%A] {}
// CHECK:STDOUT: %A.decl.loc12: type = class_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @A {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%A
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_add_abstract.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %B: type = class_type @B [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .B = %B.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %B.decl.loc4: type = class_decl @B [template = constants.%B] {}
// CHECK:STDOUT: %B.decl.loc12: type = class_decl @B [template = constants.%B] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%B
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_remove_base.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .C = %C.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %C.decl.loc4: type = class_decl @C [template = constants.%C] {}
// CHECK:STDOUT: %C.decl.loc12: type = class_decl @C [template = constants.%C] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_base_to_abstract.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %D: type = class_type @D [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .D = %D.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %D.decl.loc4: type = class_decl @D [template = constants.%D] {}
// CHECK:STDOUT: %D.decl.loc12: type = class_decl @D [template = constants.%D] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @D {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%D
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_remove_abstract.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %E: type = class_type @E [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .E = %E.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %E.decl.loc4: type = class_decl @E [template = constants.%E] {}
// CHECK:STDOUT: %E.decl.loc12: type = class_decl @E [template = constants.%E] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @E {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%E
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_abstract_to_base.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %F: type = class_type @F [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .F = %F.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %F.decl.loc4: type = class_decl @F [template = constants.%F] {}
// CHECK:STDOUT: %F.decl.loc11: type = class_decl @F [template = constants.%F] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @F {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%F
// CHECK:STDOUT: }
// CHECK:STDOUT:
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