// 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
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/declaration/no_prelude/extern_library.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/no_prelude/extern_library.carbon

// --- extern_library.carbon

library "[[@TEST_NAME]]";

extern library "extern_library_owner" fn F();

// --- extern_library_owner.carbon

library "[[@TEST_NAME]]";

import library "extern_library";

extern fn F();

// --- fail_extern_library_nonowner.carbon

library "[[@TEST_NAME]]";

import library "extern_library";

// CHECK:STDERR: fail_extern_library_nonowner.carbon:[[@LINE+8]]:1: error: declaration in library "extern_library_nonowner" doesn't match `extern library` declaration
// CHECK:STDERR: extern fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR: fail_extern_library_nonowner.carbon:[[@LINE-5]]:1: in import
// CHECK:STDERR: extern_library.carbon:4:1: note: previously declared with `extern library` here
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
extern fn F();

// --- fail_extern_library_nonextern.carbon

library "[[@TEST_NAME]]";

import library "extern_library";

// CHECK:STDERR: fail_extern_library_nonextern.carbon:[[@LINE+8]]:1: error: redeclarations of `fn F` must match use of `extern`
// CHECK:STDERR: fn F();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_extern_library_nonextern.carbon:[[@LINE-5]]:1: in import
// CHECK:STDERR: extern_library.carbon:4:1: note: previously declared here
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F();

// --- fail_extern_library_redecl.carbon

library "[[@TEST_NAME]]";

import library "extern_library";

// CHECK:STDERR: fail_extern_library_redecl.carbon:[[@LINE+8]]:1: error: declaration in library "extern_library_redecl" doesn't match `extern library` declaration
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_extern_library_redecl.carbon:[[@LINE-5]]:1: in import
// CHECK:STDERR: extern_library.carbon:4:1: note: previously declared with `extern library` here
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
extern library "extern_library_owner" fn F();

// --- extern_library_copy.carbon

library "[[@TEST_NAME]]";

extern library "extern_library_owner" fn F();

// --- fail_extern_library_collision.carbon

library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_extern_library_collision.carbon:[[@LINE+9]]:1: in import
// CHECK:STDERR: extern_library_copy.carbon:4:1: error: duplicate name being declared in the same scope
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_extern_library_collision.carbon:[[@LINE+5]]:1: in import
// CHECK:STDERR: extern_library.carbon:4:1: note: name is previously declared here
// CHECK:STDERR: extern library "extern_library_owner" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
import library "extern_library";
import library "extern_library_copy";

// --- extern_library_mismatch.carbon

library "[[@TEST_NAME]]";

extern library "extern_library_owner" fn F();

// --- fail_extern_library_mismatch_owner.carbon

library "[[@TEST_NAME]]";

import library "extern_library_mismatch"

// CHECK:STDERR: fail_extern_library_mismatch_owner.carbon:[[@LINE+4]]:1: error: `import` declarations must end with a `;`
// CHECK:STDERR: extern fn F();
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
extern fn F();

// --- fail_extern_self_library.carbon

library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_extern_self_library.carbon:[[@LINE+4]]:1: error: `extern library` cannot specify the current library
// CHECK:STDERR: extern library "extern_self_library" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
extern library "extern_self_library" fn F();

// --- extern_of_import.carbon

library "[[@TEST_NAME]]";

fn F();

// --- fail_extern_of_import_redecl.carbon

library "[[@TEST_NAME]]";

import library "extern_of_import";

// CHECK:STDERR: fail_extern_of_import_redecl.carbon:[[@LINE+7]]:1: error: redeclarations of `fn F` must match use of `extern`
// CHECK:STDERR: extern library "extern_of_import" fn F();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_extern_of_import_redecl.carbon:[[@LINE-5]]:1: in import
// CHECK:STDERR: extern_of_import.carbon:4:1: note: previously declared here
// CHECK:STDERR: fn F();
// CHECK:STDERR: ^~~~~~~
extern library "extern_of_import" fn F();

// CHECK:STDOUT: --- extern_library.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_library_owner.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref: %F.type = import_ref Main//extern_library, inst+1, loaded [template = constants.%F]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_library_nonowner.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref: %F.type = import_ref Main//extern_library, inst+1, loaded [template = constants.%F]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_library_nonextern.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref: %F.type = import_ref Main//extern_library, inst+1, loaded [template = constants.%F]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_library_redecl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref: %F.type = import_ref Main//extern_library, inst+1, loaded [template = constants.%F]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = invalid
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_library_copy.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_library_collision.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref.1 = import_ref Main//extern_library, inst+1, unloaded
// CHECK:STDOUT:   %import_ref.2 = import_ref Main//extern_library_copy, inst+1, unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = imports.%import_ref.1
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_library_mismatch.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_library_mismatch_owner.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_self_library.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_of_import.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = %F.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_of_import_redecl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %F: %F.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %import_ref: %F.type = import_ref Main//extern_of_import, inst+1, loaded [template = constants.%F]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .F = invalid
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import = import <invalid>
// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F();
// CHECK:STDOUT: