// 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/definition/no_prelude/implicit_import.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/definition/no_prelude/implicit_import.carbon

// --- basic.carbon

library "basic";

fn A();

// --- basic.impl.carbon

impl library "basic";

fn A() {}

// --- extern_api.carbon

library "extern_api";

extern fn A();

// --- fail_extern_api.impl.carbon

impl library "extern_api";

// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE+10]]:1: ERROR: Redeclarations of `fn A` in the same library must match use of `extern`.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE-5]]:6: In import.
// CHECK:STDERR: impl library "extern_api";
// CHECK:STDERR:      ^~~~~~~
// CHECK:STDERR: extern_api.carbon:4:1: Previously declared here.
// CHECK:STDERR: extern fn A();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
fn A() {}

// --- extern_impl.carbon

library "extern_impl";

fn A();

// --- fail_extern_impl.impl.carbon

impl library "extern_impl";

// CHECK:STDERR: fail_extern_impl.impl.carbon:[[@LINE+4]]:1: ERROR: `extern` not allowed on `fn` declaration that provides a definition.
// CHECK:STDERR: extern fn A() {}
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
extern fn A() {}

// --- redecl_after_def.carbon

library "redecl_after_def";

fn A() {}

// --- fail_redecl_after_def.impl.carbon

impl library "redecl_after_def";

// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE+10]]:1: ERROR: Redeclaration of `fn A` is redundant.
// CHECK:STDERR: fn A();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE-5]]:6: In import.
// CHECK:STDERR: impl library "redecl_after_def";
// CHECK:STDERR:      ^~~~~~~
// CHECK:STDERR: redecl_after_def.carbon:4:1: Previously declared here.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn A();

// --- redef_after_def.carbon

library "redef_after_def";

fn A() {}

// --- fail_redef_after_def.impl.carbon

impl library "redef_after_def";

// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE+10]]:1: ERROR: Redefinition of `fn A`.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE-5]]:6: In import.
// CHECK:STDERR: impl library "redef_after_def";
// CHECK:STDERR:      ^~~~~~~
// CHECK:STDERR: redef_after_def.carbon:4:1: Previously defined here.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn A() {}

// --- def_alias.carbon

library "def_alias";

fn A();
alias B = A;

// --- fail_def_alias.impl.carbon

impl library "def_alias";

// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE+9]]:1: ERROR: Duplicate name being declared in the same scope.
// CHECK:STDERR: fn B() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE-5]]:6: In import.
// CHECK:STDERR: impl library "def_alias";
// CHECK:STDERR:      ^~~~~~~
// CHECK:STDERR: def_alias.carbon:5:7: Name is previously declared here.
// CHECK:STDERR: alias B = A;
// CHECK:STDERR:       ^
fn B() {}

// CHECK:STDOUT: --- basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- basic.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref: %A.type = import_ref ir0, inst+1, loaded [template = constants.%A]
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_api.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_api.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref: %A.type = import_ref ir0, inst+1, loaded [template = constants.%A]
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_impl.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref: %A.type = import_ref ir0, inst+1, loaded [template = constants.%A]
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- redecl_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redecl_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref: %A.type = import_ref ir0, inst+1, loaded [template = constants.%A]
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- redef_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redef_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref: %A.type = import_ref ir0, inst+1, loaded [template = constants.%A]
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- def_alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:     .B = %B
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {}
// CHECK:STDOUT:   %A.ref: %A.type = name_ref A, %A.decl [template = constants.%A]
// CHECK:STDOUT:   %B: %A.type = bind_alias B, %A.decl [template = constants.%A]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_def_alias.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT:   %.type: type = fn_type @.1 [template]
// CHECK:STDOUT:   %.2: %.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %import_ref.1
// CHECK:STDOUT:     .B = %import_ref.2
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref.1 = import_ref ir0, inst+1, unloaded
// CHECK:STDOUT:   %import_ref.2: %A.type = import_ref ir0, inst+6, loaded [template = constants.%A]
// CHECK:STDOUT:   %.decl: %.type = fn_decl @.1 [template = constants.%.2] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @.1() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT: