// 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 "[[@TEST_NAME]]";

fn A();

// --- basic.impl.carbon

impl library "[[@TEST_NAME]]";

fn A() {}

// --- extern_api.carbon

library "[[@TEST_NAME]]";

extern fn A();

// --- fail_extern_api.impl.carbon

impl library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE+8]]:1: error: redeclarations of `fn A` must match use of `extern` [RedeclExternMismatch]
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE-5]]:6: in import [InImport]
// CHECK:STDERR: extern_api.carbon:4:1: note: previously declared here [RedeclPrevDecl]
// CHECK:STDERR: extern fn A();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
fn A() {}

// --- extern_impl.carbon

library "[[@TEST_NAME]]";

fn A();

// --- fail_extern_impl.impl.carbon

impl library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_extern_impl.impl.carbon:[[@LINE+8]]:1: error: redeclarations of `fn A` must match use of `extern` [RedeclExternMismatch]
// CHECK:STDERR: extern fn A() {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_extern_impl.impl.carbon:[[@LINE-5]]:6: in import [InImport]
// CHECK:STDERR: extern_impl.carbon:4:1: note: previously declared here [RedeclPrevDecl]
// CHECK:STDERR: fn A();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
extern fn A() {}

// --- redecl_after_def.carbon

library "[[@TEST_NAME]]";

fn A() {}

// --- fail_redecl_after_def.impl.carbon

impl library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE+8]]:1: error: redeclaration of `fn A` is redundant [RedeclRedundant]
// CHECK:STDERR: fn A();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE-5]]:6: in import [InImport]
// CHECK:STDERR: redecl_after_def.carbon:4:1: note: previously declared here [RedeclPrevDecl]
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn A();

// --- redef_after_def.carbon

library "[[@TEST_NAME]]";

fn A() {}

// --- fail_redef_after_def.impl.carbon

impl library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE+8]]:1: error: redefinition of `fn A` [RedeclRedef]
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE-5]]:6: in import [InImport]
// CHECK:STDERR: redef_after_def.carbon:4:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn A() {}

// --- def_alias.carbon

library "[[@TEST_NAME]]";

fn A();
alias B = A;

// --- fail_def_alias.impl.carbon

impl library "[[@TEST_NAME]]";

// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE+8]]:1: error: duplicate name being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: fn B() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_def_alias.impl.carbon:[[@LINE-5]]:6: in import [InImport]
// CHECK:STDERR: def_alias.carbon:5:7: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: alias B = A;
// CHECK:STDERR:       ^
// CHECK:STDERR:
fn B() {}

// CHECK:STDOUT: --- basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() [from "basic.carbon"] {
// 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:   %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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @A() [from "extern_api.carbon"] {
// 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:   %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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() [from "extern_impl.carbon"] {
// 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:   %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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = %A.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %A.decl: %A.type = fn_decl @A [template = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() [from "redecl_after_def.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: --- redef_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type: type = fn_type @A [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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT:   %.type: type = fn_type @.1 [template]
// CHECK:STDOUT:   %.d85: %.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Main.A: %A.type = import_ref Main//redef_after_def, A, loaded [template = constants.%A]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = imports.%Main.A
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %.decl: %.type = fn_decl @.1 [template = constants.%.d85] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() [from "redef_after_def.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: fn @.1() {
// 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:   %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:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT:   %.type: type = fn_type @.1 [template]
// CHECK:STDOUT:   %.d85: %.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Main.A = import_ref Main//def_alias, A, unloaded
// CHECK:STDOUT:   %Main.B: %A.type = import_ref Main//def_alias, B, loaded [template = constants.%A]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .A = imports.%Main.A
// CHECK:STDOUT:     .B = imports.%Main.B
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %default.import.loc2_6.1 = import <none>
// CHECK:STDOUT:   %default.import.loc2_6.2 = import <none>
// CHECK:STDOUT:   %.decl: %.type = fn_decl @.1 [template = constants.%.d85] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() [from "def_alias.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: fn @.1() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT: