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

// CHECK:STDERR: fail_collapse.carbon:[[@LINE+4]]:9: warning: `const` applied repeatedly to the same type has no additional effect
// CHECK:STDERR: fn G(p: const (const i32)**) -> i32** {
// CHECK:STDERR:         ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn G(p: const (const i32)**) -> i32** {
  // CHECK:STDERR: fail_collapse.carbon:[[@LINE+6]]:3: error: cannot implicitly convert from `const i32**` to `i32**`
  // CHECK:STDERR:   return p;
  // CHECK:STDERR:   ^~~~~~~~~
  // CHECK:STDERR: fail_collapse.carbon:[[@LINE+3]]:3: note: type `const i32**` does not implement interface `ImplicitAs`
  // CHECK:STDERR:   return p;
  // CHECK:STDERR:   ^~~~~~~~~
  return p;
}

// CHECK:STDOUT: --- fail_collapse.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Int32.type: type = fn_type @Int32 [template]
// CHECK:STDOUT:   %.1: type = tuple_type () [template]
// CHECK:STDOUT:   %Int32: %Int32.type = struct_value () [template]
// CHECK:STDOUT:   %.2: type = const_type i32 [template]
// CHECK:STDOUT:   %.3: type = ptr_type %.2 [template]
// CHECK:STDOUT:   %.4: type = ptr_type %.3 [template]
// CHECK:STDOUT:   %.5: type = ptr_type i32 [template]
// CHECK:STDOUT:   %.6: type = ptr_type %.5 [template]
// CHECK:STDOUT:   %G.type: type = fn_type @G [template]
// CHECK:STDOUT:   %G: %G.type = struct_value () [template]
// CHECK:STDOUT:   %ImplicitAs.type: type = generic_interface_type @ImplicitAs [template]
// CHECK:STDOUT:   %ImplicitAs: %ImplicitAs.type = struct_value () [template]
// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest 0 [symbolic]
// CHECK:STDOUT:   %.7: type = interface_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic]
// CHECK:STDOUT:   %Self.1: @ImplicitAs.%.1 (%.7) = bind_symbolic_name Self 1 [symbolic]
// CHECK:STDOUT:   %Self.2: %.7 = bind_symbolic_name Self 1 [symbolic]
// CHECK:STDOUT:   %Convert.type.1: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic]
// CHECK:STDOUT:   %Convert.1: %Convert.type.1 = struct_value () [symbolic]
// CHECK:STDOUT:   %.8: type = assoc_entity_type %.7, %Convert.type.1 [symbolic]
// CHECK:STDOUT:   %.9: %.8 = assoc_entity element0, imports.%import_ref.6 [symbolic]
// CHECK:STDOUT:   %.10: type = interface_type @ImplicitAs, @ImplicitAs(%.6) [template]
// CHECK:STDOUT:   %Convert.type.2: type = fn_type @Convert, @ImplicitAs(%.6) [template]
// CHECK:STDOUT:   %Convert.2: %Convert.type.2 = struct_value () [template]
// CHECK:STDOUT:   %.11: type = assoc_entity_type %.10, %Convert.type.2 [template]
// CHECK:STDOUT:   %.12: %.11 = assoc_entity element0, imports.%import_ref.6 [template]
// CHECK:STDOUT:   %.13: %.8 = assoc_entity element0, imports.%import_ref.7 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT:     .Int32 = %import_ref.1
// CHECK:STDOUT:     .ImplicitAs = %import_ref.2
// CHECK:STDOUT:     import Core//prelude
// CHECK:STDOUT:     import Core//prelude/operators
// CHECK:STDOUT:     import Core//prelude/types
// CHECK:STDOUT:     import Core//prelude/operators/arithmetic
// CHECK:STDOUT:     import Core//prelude/operators/as
// CHECK:STDOUT:     import Core//prelude/operators/bitwise
// CHECK:STDOUT:     import Core//prelude/operators/comparison
// CHECK:STDOUT:     import Core//prelude/types/bool
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %import_ref.1: %Int32.type = import_ref Core//prelude/types, inst+4, loaded [template = constants.%Int32]
// CHECK:STDOUT:   %import_ref.2: %ImplicitAs.type = import_ref Core//prelude/operators/as, inst+40, loaded [template = constants.%ImplicitAs]
// CHECK:STDOUT:   %import_ref.3 = import_ref Core//prelude/operators/as, inst+45, unloaded
// CHECK:STDOUT:   %import_ref.4: @ImplicitAs.%.2 (%.8) = import_ref Core//prelude/operators/as, inst+63, loaded [symbolic = @ImplicitAs.%.3 (constants.%.13)]
// CHECK:STDOUT:   %import_ref.5 = import_ref Core//prelude/operators/as, inst+56, unloaded
// CHECK:STDOUT:   %import_ref.6 = import_ref Core//prelude/operators/as, inst+56, unloaded
// CHECK:STDOUT:   %import_ref.7 = import_ref Core//prelude/operators/as, inst+56, unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   package: <namespace> = namespace [template] {
// CHECK:STDOUT:     .Core = imports.%Core
// CHECK:STDOUT:     .G = %G.decl
// CHECK:STDOUT:   }
// CHECK:STDOUT:   %Core.import = import Core
// CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {
// CHECK:STDOUT:     %p.patt: %.4 = binding_pattern p
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %int.make_type_32.loc15_22: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT:     %.loc15_16.1: type = value_of_initializer %int.make_type_32.loc15_22 [template = i32]
// CHECK:STDOUT:     %.loc15_16.2: type = converted %int.make_type_32.loc15_22, %.loc15_16.1 [template = i32]
// CHECK:STDOUT:     %.loc15_16.3: type = const_type i32 [template = constants.%.2]
// CHECK:STDOUT:     %.loc15_9: type = const_type %.2 [template = constants.%.2]
// CHECK:STDOUT:     %.loc15_26: type = ptr_type %.2 [template = constants.%.3]
// CHECK:STDOUT:     %.loc15_27: type = ptr_type %.3 [template = constants.%.4]
// CHECK:STDOUT:     %p.param: %.4 = param p, runtime_param0
// CHECK:STDOUT:     %p: %.4 = bind_name p, %p.param
// CHECK:STDOUT:     %int.make_type_32.loc15_33: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT:     %.loc15_36.1: type = value_of_initializer %int.make_type_32.loc15_33 [template = i32]
// CHECK:STDOUT:     %.loc15_36.2: type = converted %int.make_type_32.loc15_33, %.loc15_36.1 [template = i32]
// CHECK:STDOUT:     %.loc15_36.3: type = ptr_type i32 [template = constants.%.5]
// CHECK:STDOUT:     %.loc15_37: type = ptr_type %.5 [template = constants.%.6]
// CHECK:STDOUT:     %return: ref %.6 = var <return slot>
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic interface @ImplicitAs(constants.%Dest: type) {
// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest 0 [symbolic = %Dest (constants.%Dest)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:   %.1: type = interface_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic = %.1 (constants.%.7)]
// CHECK:STDOUT:   %Self: %.7 = bind_symbolic_name Self 1 [symbolic = %Self (constants.%Self.2)]
// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert, @ImplicitAs(%Dest) [symbolic = %Convert.type (constants.%Convert.type.1)]
// CHECK:STDOUT:   %Convert: @ImplicitAs.%Convert.type (%Convert.type.1) = struct_value () [symbolic = %Convert (constants.%Convert.1)]
// CHECK:STDOUT:   %.2: type = assoc_entity_type @ImplicitAs.%.1 (%.7), @ImplicitAs.%Convert.type (%Convert.type.1) [symbolic = %.2 (constants.%.8)]
// CHECK:STDOUT:   %.3: @ImplicitAs.%.2 (%.8) = assoc_entity element0, imports.%import_ref.6 [symbolic = %.3 (constants.%.9)]
// CHECK:STDOUT:
// CHECK:STDOUT:   interface {
// CHECK:STDOUT:   !members:
// CHECK:STDOUT:     .Self = imports.%import_ref.3
// CHECK:STDOUT:     .Convert = imports.%import_ref.4
// CHECK:STDOUT:     witness = (imports.%import_ref.5)
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Int32() -> type = "int.make_type_32";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%p: %.4) -> %.6 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %p.ref: %.4 = name_ref p, %p
// CHECK:STDOUT:   %.loc22_11.1: type = interface_type @ImplicitAs, @ImplicitAs(constants.%.6) [template = constants.%.10]
// CHECK:STDOUT:   %.loc22_11.2: %.11 = specific_constant imports.%import_ref.4, @ImplicitAs(constants.%.6) [template = constants.%.12]
// CHECK:STDOUT:   %Convert.ref: %.11 = name_ref Convert, %.loc22_11.2 [template = constants.%.12]
// CHECK:STDOUT:   %.loc22_11.3: %.6 = converted %p.ref, <error> [template = <error>]
// CHECK:STDOUT:   return <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Convert(constants.%Dest: type, constants.%Self.1: @ImplicitAs.%.1 (%.7)) {
// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest 0 [symbolic = %Dest (constants.%Dest)]
// CHECK:STDOUT:   %.1: type = interface_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic = %.1 (constants.%.7)]
// CHECK:STDOUT:   %Self: %.7 = bind_symbolic_name Self 1 [symbolic = %Self (constants.%Self.2)]
// CHECK:STDOUT:
// CHECK:STDOUT:   fn[%self: @Convert.%Self (%Self.2)]() -> @Convert.%Dest (%Dest);
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ImplicitAs(constants.%Dest) {
// CHECK:STDOUT:   %Dest => constants.%Dest
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ImplicitAs(@ImplicitAs.%Dest) {
// CHECK:STDOUT:   %Dest => constants.%Dest
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ImplicitAs(@Convert.%Dest) {
// CHECK:STDOUT:   %Dest => constants.%Dest
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Convert(constants.%Dest, constants.%Self.1) {
// CHECK:STDOUT:   %Dest => constants.%Dest
// CHECK:STDOUT:   %.1 => constants.%.7
// CHECK:STDOUT:   %Self => constants.%Self.1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ImplicitAs(constants.%.6) {
// CHECK:STDOUT:   %Dest => constants.%.6
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:   %.1 => constants.%.10
// CHECK:STDOUT:   %Self => constants.%Self.2
// CHECK:STDOUT:   %Convert.type => constants.%Convert.type.2
// CHECK:STDOUT:   %Convert => constants.%Convert.2
// CHECK:STDOUT:   %.2 => constants.%.11
// CHECK:STDOUT:   %.3 => constants.%.12
// CHECK:STDOUT: }
// CHECK:STDOUT: