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

fn A();

namespace N;
fn N.A();

namespace N.M;

fn N.M.B() -> i32 {
  // This is N.A, not package.A.
  A();
  if (true) {
    var A: i32 = 0;
    // This is the local A.
    // TODO: Decide if we should warn or error on the shadowing of N.A here.
    return A;
  }
  return 0;
}

// CHECK:STDOUT: --- shadow.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %A.type.00d: type = fn_type @A.1 [concrete]
// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT:   %A.1db: %A.type.00d = struct_value () [concrete]
// CHECK:STDOUT:   %A.type.0e8: type = fn_type @A.2 [concrete]
// CHECK:STDOUT:   %A.281: %A.type.0e8 = struct_value () [concrete]
// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT:   %pattern_type.7ce: type = pattern_type %i32 [concrete]
// CHECK:STDOUT:   %B.type: type = fn_type @B [concrete]
// CHECK:STDOUT:   %B: %B.type = struct_value () [concrete]
// CHECK:STDOUT:   %true: bool = bool_literal true [concrete]
// CHECK:STDOUT:   %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_0.5c6, %Convert.956 [concrete]
// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_0.5c6, %Convert.specific_fn [concrete]
// CHECK:STDOUT:   %int_0.6a9: %i32 = int_value 0 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT:     .Int = %Core.Int
// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/...
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .A = %A.decl.loc11
// CHECK:STDOUT:     .N = %N
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %A.decl.loc11: %A.type.00d = fn_decl @A.1 [concrete = constants.%A.1db] {} {}
// CHECK:STDOUT:   %N: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .A = %A.decl.loc14
// CHECK:STDOUT:     .M = %M
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.decl.loc14: %A.type.0e8 = fn_decl @A.2 [concrete = constants.%A.281] {} {}
// CHECK:STDOUT:   %M: <namespace> = namespace [concrete] {
// CHECK:STDOUT:     .B = %B.decl
// CHECK:STDOUT:     .A = <poisoned>
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %B.decl: %B.type = fn_decl @B [concrete = constants.%B] {
// CHECK:STDOUT:     %return.patt: %pattern_type.7ce = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type.7ce = out_param_pattern %return.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %int_32.loc18: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT:     %i32.loc18: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT:     %return.param: ref %i32 = out_param call_param0
// CHECK:STDOUT:     %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A.1();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A.2();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B() -> %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %A.ref.loc20: %A.type.0e8 = name_ref A, file.%A.decl.loc14 [concrete = constants.%A.281]
// CHECK:STDOUT:   %A.call: init %empty_tuple.type = call %A.ref.loc20()
// CHECK:STDOUT:   %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT:   if %true br !if.then else br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then:
// CHECK:STDOUT:   name_binding_decl {
// CHECK:STDOUT:     %A.patt: %pattern_type.7ce = binding_pattern A [concrete]
// CHECK:STDOUT:     %.loc22_5.1: %pattern_type.7ce = var_pattern %A.patt [concrete]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A.var: ref %i32 = var A
// CHECK:STDOUT:   %int_0.loc22: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT:   %impl.elem0.loc22: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT:   %bound_method.loc22_5.1: <bound method> = bound_method %int_0.loc22, %impl.elem0.loc22 [concrete = constants.%Convert.bound]
// CHECK:STDOUT:   %specific_fn.loc22: <specific function> = specific_function %impl.elem0.loc22, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT:   %bound_method.loc22_5.2: <bound method> = bound_method %int_0.loc22, %specific_fn.loc22 [concrete = constants.%bound_method]
// CHECK:STDOUT:   %int.convert_checked.loc22: init %i32 = call %bound_method.loc22_5.2(%int_0.loc22) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT:   %.loc22_5.2: init %i32 = converted %int_0.loc22, %int.convert_checked.loc22 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT:   assign %A.var, %.loc22_5.2
// CHECK:STDOUT:   %.loc22_12: type = splice_block %i32.loc22 [concrete = constants.%i32] {
// CHECK:STDOUT:     %int_32.loc22: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT:     %i32.loc22: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %A: ref %i32 = bind_name A, %A.var
// CHECK:STDOUT:   %A.ref.loc25: ref %i32 = name_ref A, %A
// CHECK:STDOUT:   %.loc25: %i32 = bind_value %A.ref.loc25
// CHECK:STDOUT:   return %.loc25
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else:
// CHECK:STDOUT:   %int_0.loc27: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT:   %impl.elem0.loc27: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT:   %bound_method.loc27_11.1: <bound method> = bound_method %int_0.loc27, %impl.elem0.loc27 [concrete = constants.%Convert.bound]
// CHECK:STDOUT:   %specific_fn.loc27: <specific function> = specific_function %impl.elem0.loc27, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT:   %bound_method.loc27_11.2: <bound method> = bound_method %int_0.loc27, %specific_fn.loc27 [concrete = constants.%bound_method]
// CHECK:STDOUT:   %int.convert_checked.loc27: init %i32 = call %bound_method.loc27_11.2(%int_0.loc27) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT:   %.loc27_11.1: %i32 = value_of_initializer %int.convert_checked.loc27 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT:   %.loc27_11.2: %i32 = converted %int_0.loc27, %.loc27_11.1 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT:   return %.loc27_11.2
// CHECK:STDOUT: }
// CHECK:STDOUT: