// 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/namespace/merging.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/namespace/merging.carbon

// --- a.carbon

package Example library "a";

namespace NS;

fn NS.A() {}

// --- b.carbon

package Example library "b";

namespace NS;

fn NS.B1() {}

namespace NS;

fn NS.B2() {}

// --- c.carbon

package Example library "c";

import library "a";
import library "b";

namespace NS;

fn NS.C() {}

fn Run() {
  NS.A();
  NS.B1();
  NS.B2();
  NS.C();
}

// CHECK:STDOUT: --- a.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:     .Core = %Core
// CHECK:STDOUT:     .NS = %NS
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT:   %NS: <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: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %B1.type: type = fn_type @B1 [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %B1: %B1.type = struct_value () [template]
// CHECK:STDOUT:   %B2.type: type = fn_type @B2 [template]
// CHECK:STDOUT:   %B2: %B2.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .Core = %Core
// CHECK:STDOUT:     .NS = %NS
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT:   %NS: <namespace> = namespace [template] {
// CHECK:STDOUT:     .B1 = %B1.decl
// CHECK:STDOUT:     .B2 = %B2.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %B1.decl: %B1.type = fn_decl @B1 [template = constants.%B1] {}
// CHECK:STDOUT:   %.loc8: <namespace> = namespace [template] {}
// CHECK:STDOUT:   %B2.decl: %B2.type = fn_decl @B2 [template = constants.%B2] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B1() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B2() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- c.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %C.type: type = fn_type @C [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %C: %C.type = struct_value () [template]
// CHECK:STDOUT:   %Run.type: type = fn_type @Run [template]
// CHECK:STDOUT:   %Run: %Run.type = struct_value () [template]
// CHECK:STDOUT:   %A.type: type = fn_type @A [template]
// CHECK:STDOUT:   %A: %A.type = struct_value () [template]
// CHECK:STDOUT:   %B1.type: type = fn_type @B1 [template]
// CHECK:STDOUT:   %B1: %B1.type = struct_value () [template]
// CHECK:STDOUT:   %B2.type: type = fn_type @B2 [template]
// CHECK:STDOUT:   %B2: %B2.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .NS = %NS
// CHECK:STDOUT:     .Core = %Core
// CHECK:STDOUT:     .Run = %Run.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref.1: <namespace> = import_ref ir1, inst+2, loaded
// CHECK:STDOUT:   %NS: <namespace> = namespace %import_ref.1, [template] {
// CHECK:STDOUT:     .A = %import_ref.2
// CHECK:STDOUT:     .B1 = %import_ref.3
// CHECK:STDOUT:     .B2 = %import_ref.4
// CHECK:STDOUT:     .C = %C.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref.2: %A.type = import_ref ir1, inst+3, loaded [template = constants.%A]
// CHECK:STDOUT:   %import_ref.3: %B1.type = import_ref ir2, inst+3, loaded [template = constants.%B1]
// CHECK:STDOUT:   %import_ref.4: %B2.type = import_ref ir2, inst+9, loaded [template = constants.%B2]
// CHECK:STDOUT:   %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT:   %.loc7: <namespace> = namespace [template] {}
// CHECK:STDOUT:   %C.decl: %C.type = fn_decl @C [template = constants.%C] {}
// CHECK:STDOUT:   %Run.decl: %Run.type = fn_decl @Run [template = constants.%Run] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Run() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %NS.ref.loc12: <namespace> = name_ref NS, file.%NS [template = file.%NS]
// CHECK:STDOUT:   %A.ref: %A.type = name_ref A, file.%import_ref.2 [template = constants.%A]
// CHECK:STDOUT:   %A.call: init %.1 = call %A.ref()
// CHECK:STDOUT:   %NS.ref.loc13: <namespace> = name_ref NS, file.%NS [template = file.%NS]
// CHECK:STDOUT:   %B1.ref: %B1.type = name_ref B1, file.%import_ref.3 [template = constants.%B1]
// CHECK:STDOUT:   %B1.call: init %.1 = call %B1.ref()
// CHECK:STDOUT:   %NS.ref.loc14: <namespace> = name_ref NS, file.%NS [template = file.%NS]
// CHECK:STDOUT:   %B2.ref: %B2.type = name_ref B2, file.%import_ref.4 [template = constants.%B2]
// CHECK:STDOUT:   %B2.call: init %.1 = call %B2.ref()
// CHECK:STDOUT:   %NS.ref.loc15: <namespace> = name_ref NS, file.%NS [template = file.%NS]
// CHECK:STDOUT:   %C.ref: %C.type = name_ref C, file.%C.decl [template = constants.%C]
// CHECK:STDOUT:   %C.call: init %.1 = call %C.ref()
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B1();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B2();
// CHECK:STDOUT: