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7871237c1503a7668483a1dd9d2b82f2c598063f
carbon-lang/toolchain/check/testdata/pointer/nested_const.carbon
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Chandler Carruthandjosh11b 7871237c15 Move self to the explicit () parameter list (proposal #7016) (#7272) 
Implements proposal #7016: `self` moves from the deduced implicit list
(`fn F[self: Self]()`) to the front of the explicit list. Its type may
be written explicitly (`fn F(self: Self)`) or omitted, in which case it
defaults to `Self` (`fn F(self)`, `fn F(ref self)`); `self` in the
implicit list is rejected.

Throughout checking, `self` is modeled as the first explicit parameter.
Because a method is just a function whose first parameter is `self`, it
can also be called as an ordinary function with the receiver passed
explicitly (`Type.M(obj, ...)`), not only as `obj.M(...)`. A new
`SemIR::CallArgParamPatterns` helper chooses the parameters matched
against the explicit arguments, excluding a leading `self` only when it
is supplied as a method-call receiver; arity checking, conversion, and
generic deduction use it. The resulting SemIR and lowering are
unchanged: `self` is still `call_param0`, and witnesses, thunks, and
vtables are unaffected.

An omitted `self` type is parsed as a `SelfBindingPattern` node with no
type expression; checking synthesizes the `Self` type so it behaves
exactly like `self: Self`. However, the exact spelling used must match
between a forward declaration and a definition, following #3763's rules
around declaration matching.

Generated functions, thunks, and C++ interop import/export build `self`
as the first explicit parameter, and the `self`-type override (e.g.
Derived->Base for a virtual override) applies to the explicit `self`.
Placement is validated by new diagnostics: `SelfInImplicitParamList`,
`SelfNotFirstParam`, and `SelfOutsideParamList`. The benchmark source
generator and the documentation adopt the `(self)` shorthand; the
prelude, the examples, and the test data are migrated in the following
commits.

Assisted-by: Claude Code with Claude Opus 4.7

---------

Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
2026-06-10 15:30:43 +00:00

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// 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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/pointer/nested_const.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/pointer/nested_const.carbon
// TODO: The `const` in the return type should not be necessary.
fn F(p: const (const (const i32*)*)) -> const i32 {
return **p;
}
// CHECK:STDOUT: --- nested_const.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %const.6a8: type = const_type %i32 [concrete]
// CHECK:STDOUT: %ptr.774: type = ptr_type %const.6a8 [concrete]
// CHECK:STDOUT: %const.8df: type = const_type %ptr.774 [concrete]
// CHECK:STDOUT: %ptr.f93: type = ptr_type %const.8df [concrete]
// CHECK:STDOUT: %const.99e: type = const_type %ptr.f93 [concrete]
// CHECK:STDOUT: %pattern_type.a04: type = pattern_type %const.99e [concrete]
// CHECK:STDOUT: %.242: Core.Form = init_form %const.6a8 [concrete]
// CHECK:STDOUT: %pattern_type.ed1: type = pattern_type %const.6a8 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %T.f84: %Copy.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %const.as.Copy.impl.Op.type.145: type = fn_type @const.as.Copy.impl.Op, @const.as.Copy.impl(%T.f84) [symbolic]
// CHECK:STDOUT: %const.as.Copy.impl.Op.093: %const.as.Copy.impl.Op.type.145 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.0e0: <witness> = impl_witness imports.%Copy.impl_witness_table.367, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Copy.facet.987: %Copy.type = facet_value %i32, (%Copy.impl_witness.0e0) [concrete]
// CHECK:STDOUT: %Copy.impl_witness.0b0: <witness> = impl_witness imports.%Copy.impl_witness_table.554, @const.as.Copy.impl(%Copy.facet.987) [concrete]
// CHECK:STDOUT: %const.as.Copy.impl.Op.type.9b1: type = fn_type @const.as.Copy.impl.Op, @const.as.Copy.impl(%Copy.facet.987) [concrete]
// CHECK:STDOUT: %const.as.Copy.impl.Op.9cf: %const.as.Copy.impl.Op.type.9b1 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.96e: %Copy.type = facet_value %const.6a8, (%Copy.impl_witness.0b0) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.49b: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.96e) [concrete]
// CHECK:STDOUT: %.367: type = fn_type_with_self_type %Copy.WithSelf.Op.type.49b, %Copy.facet.96e [concrete]
// CHECK:STDOUT: %const.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %const.as.Copy.impl.Op.9cf, @const.as.Copy.impl.Op(%Copy.facet.987) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .Copy = %Core.Copy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.Copy: type = import_ref Core//prelude/parts/copy, Copy, loaded [concrete = constants.%Copy.type]
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.367 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.f89: @const.as.Copy.impl.%const.as.Copy.impl.Op.type (%const.as.Copy.impl.Op.type.145) = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [symbolic = @const.as.Copy.impl.%const.as.Copy.impl.Op (constants.%const.as.Copy.impl.Op.093)]
// CHECK:STDOUT: %Copy.impl_witness_table.554 = impl_witness_table (%Core.import_ref.f89), @const.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %p.param_patt: %pattern_type.a04 = value_param_pattern [concrete]
// CHECK:STDOUT: %p.patt: %pattern_type.a04 = at_binding_pattern p, %p.param_patt [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.ed1 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.ed1 = return_slot_pattern %return.param_patt, %const.loc16_41 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32.loc16_47: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %const.loc16_41: type = const_type %i32.loc16_47 [concrete = constants.%const.6a8]
// CHECK:STDOUT: %.loc16_41: Core.Form = init_form %const.loc16_41 [concrete = constants.%.242]
// CHECK:STDOUT: %p.param: %const.99e = value_param call_param0
// CHECK:STDOUT: %.loc16_9: type = splice_block %const.loc16_9 [concrete = constants.%const.99e] {
// CHECK:STDOUT: %i32.loc16_29: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %const.loc16_23: type = const_type %i32.loc16_29 [concrete = constants.%const.6a8]
// CHECK:STDOUT: %ptr.loc16_32: type = ptr_type %const.loc16_23 [concrete = constants.%ptr.774]
// CHECK:STDOUT: %const.loc16_16: type = const_type %ptr.loc16_32 [concrete = constants.%const.8df]
// CHECK:STDOUT: %ptr.loc16_34: type = ptr_type %const.loc16_16 [concrete = constants.%ptr.f93]
// CHECK:STDOUT: %const.loc16_9: type = const_type %ptr.loc16_34 [concrete = constants.%const.99e]
// CHECK:STDOUT: }
// CHECK:STDOUT: %p: %const.99e = value_binding p, %p.param
// CHECK:STDOUT: %return.param: ref %const.6a8 = out_param call_param1
// CHECK:STDOUT: %return: ref %const.6a8 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%p.param: %const.99e) -> out %return.param: %const.6a8 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %p.ref: %const.99e = name_ref p, %p
// CHECK:STDOUT: %.loc17_11.1: ref %const.8df = deref %p.ref
// CHECK:STDOUT: %.loc17_11.2: %const.8df = acquire_value %.loc17_11.1
// CHECK:STDOUT: %.loc17_10.1: ref %const.6a8 = deref %.loc17_11.2
// CHECK:STDOUT: %.loc17_10.2: %const.6a8 = acquire_value %.loc17_10.1
// CHECK:STDOUT: %impl.elem0: %.367 = impl_witness_access constants.%Copy.impl_witness.0b0, element0 [concrete = constants.%const.as.Copy.impl.Op.9cf]
// CHECK:STDOUT: %bound_method.loc17_10.1: <bound method> = bound_method %.loc17_10.2, %impl.elem0
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value constants.%i32, (constants.%Copy.impl_witness.0e0) [concrete = constants.%Copy.facet.987]
// CHECK:STDOUT: %.loc17_10.3: %Copy.type = converted constants.%i32, %Copy.facet [concrete = constants.%Copy.facet.987]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @const.as.Copy.impl.Op(constants.%Copy.facet.987) [concrete = constants.%const.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc17_10.2: <bound method> = bound_method %.loc17_10.2, %specific_fn
// CHECK:STDOUT: %const.as.Copy.impl.Op.call: init %const.6a8 = call %bound_method.loc17_10.2(%.loc17_10.2)
// CHECK:STDOUT: return %const.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
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