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7871237c1503a7668483a1dd9d2b82f2c598063f
carbon-lang/toolchain/check/testdata/impl/lookup/instance_method.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/impl/lookup/instance_method.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/instance_method.carbon
class C;
interface I {
fn F(self) -> i32;
}
class C {
extend impl as I {
fn F(self) -> i32;
}
}
fn F(c: C) -> i32 {
return c.F();
}
// CHECK:STDOUT: --- instance_method.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %pattern_type.c60: type = pattern_type %Self.as_type [symbolic]
// 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: %.795: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.dcc: type = fn_type @I.WithSelf.F, @I.WithSelf(%Self) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.ec6: %I.WithSelf.F.type.dcc = struct_value () [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.WithSelf.%I.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %pattern_type.98b: type = pattern_type %C [concrete]
// CHECK:STDOUT: %C.as.I.impl.F.type: type = fn_type @C.as.I.impl.F [concrete]
// CHECK:STDOUT: %C.as.I.impl.F: %C.as.I.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.064: type = fn_type @I.WithSelf.F, @I.WithSelf(%I.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.513: %I.WithSelf.F.type.064 = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %C.type.facet: %type = facet_value %C, () [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.b04: type = fn_type @I.WithSelf.F, @I.WithSelf(%C.type.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.cef: %I.WithSelf.F.type.b04 = struct_value () [concrete]
// CHECK:STDOUT: %.ea0: type = fn_type_with_self_type %I.WithSelf.F.type.064, %I.facet [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// 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: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .C = %C.decl.loc15
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %C.decl.loc15: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: %C.decl.loc21: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %c.param_patt: %pattern_type.98b = value_param_pattern [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.98b = at_binding_pattern c, %c.param_patt [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc27: Core.Form = init_form %i32 [concrete = constants.%.795]
// CHECK:STDOUT: %c.param: %C = value_param call_param0
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl.loc15 [concrete = constants.%C]
// CHECK:STDOUT: %c: %C = value_binding c, %c.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %I.WithSelf.decl = interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %I.WithSelf.F.decl: @I.WithSelf.%I.WithSelf.F.type (%I.WithSelf.F.type.dcc) = fn_decl @I.WithSelf.F [symbolic = @I.WithSelf.%I.WithSelf.F (constants.%I.WithSelf.F.ec6)] {
// CHECK:STDOUT: %self.param_patt: @I.WithSelf.F.%pattern_type (%pattern_type.c60) = value_param_pattern [concrete]
// CHECK:STDOUT: %self.patt: @I.WithSelf.F.%pattern_type (%pattern_type.c60) = at_binding_pattern self, %self.param_patt [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc18_17: Core.Form = init_form %i32 [concrete = constants.%.795]
// CHECK:STDOUT: %self.param: @I.WithSelf.F.%Self.as_type.loc18_8.1 (%Self.as_type) = value_param call_param0
// CHECK:STDOUT: %.loc18_8.1: type = splice_block %.loc18_8.2 [symbolic = %Self.as_type.loc18_8.1 (constants.%Self.as_type)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc18_8.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc18_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %.loc18_8.2: type = converted %Self.ref, %Self.as_type.loc18_8.2 [symbolic = %Self.as_type.loc18_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @I.WithSelf.F.%Self.as_type.loc18_8.1 (%Self.as_type) = value_binding self, %self.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @I.WithSelf.%assoc0
// CHECK:STDOUT: witness = (@I.WithSelf.%I.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: %Self.ref as %I.ref {
// CHECK:STDOUT: %C.as.I.impl.F.decl: %C.as.I.impl.F.type = fn_decl @C.as.I.impl.F [concrete = constants.%C.as.I.impl.F] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.98b = value_param_pattern [concrete]
// CHECK:STDOUT: %self.patt: %pattern_type.98b = at_binding_pattern self, %self.param_patt [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc23: Core.Form = init_form %i32 [concrete = constants.%.795]
// CHECK:STDOUT: %self.param: %C = value_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %self: %C = value_binding self, %self.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%C.as.I.impl.F.decl), @C.as.I.impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %C.as.I.impl.F.decl
// CHECK:STDOUT: extend %I.ref
// CHECK:STDOUT: witness = %I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: impl_decl @C.as.I.impl [concrete] {} {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: .I = <poisoned>
// CHECK:STDOUT: .F = <poisoned>
// CHECK:STDOUT: extend @C.as.I.impl.%I.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(@I.%Self: %I.type) {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc18_8.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc18_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type.loc18_8.1 [symbolic = %pattern_type (constants.%pattern_type.c60)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @I.WithSelf.F.%Self.as_type.loc18_8.1 (%Self.as_type)) -> out %return.param: %i32;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.I.impl.F(%self.param: %C) -> out %return.param: %i32;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%c.param: %C) -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, @I.WithSelf.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %.ea0 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.F]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %C.as.I.impl.F.call: init %i32 = call %bound_method(%c.ref)
// CHECK:STDOUT: return %C.as.I.impl.F.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.dcc
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.ec6
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type.loc18_8.1 => constants.%Self.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.c60
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%I.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.064
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.513
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%I.facet) {
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %Self.as_type.loc18_8.1 => constants.%C
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.98b
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%C.type.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%C.type.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.b04
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.cef
// CHECK:STDOUT: }
// CHECK:STDOUT:
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