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7871237c1503a7668483a1dd9d2b82f2c598063f
carbon-lang/toolchain/check/testdata/interface/fail_duplicate.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/none.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/interface/fail_duplicate.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/fail_duplicate.carbon
// --- fail_redefine_without_dependents.carbon
library "[[@TEST_NAME]]";
interface Interface { }
// CHECK:STDERR: fail_redefine_without_dependents.carbon:[[@LINE+7]]:1: error: redefinition of `interface Interface` [RedeclRedef]
// CHECK:STDERR: interface Interface {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_redefine_without_dependents.carbon:[[@LINE-5]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: interface Interface { }
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface Interface {
fn F();
}
// --- fail_redefine_with_dependents.carbon
library "[[@TEST_NAME]]";
interface Interface {}
// CHECK:STDERR: fail_redefine_with_dependents.carbon:[[@LINE+7]]:1: error: redefinition of `interface Interface` [RedeclRedef]
// CHECK:STDERR: interface Interface {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_redefine_with_dependents.carbon:[[@LINE-5]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: interface Interface {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface Interface {
fn F(self);
}
// --- fail_name_conflict_with_fn.carbon
library "[[@TEST_NAME]]";
fn Function();
// CHECK:STDERR: fail_name_conflict_with_fn.carbon:[[@LINE+7]]:11: error: duplicate name `Function` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: interface Function;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_name_conflict_with_fn.carbon:[[@LINE-5]]:1: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: fn Function();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
interface Function;
// --- fail_name_conflict_with_class.carbon
class Class;
// CHECK:STDERR: fail_name_conflict_with_class.carbon:[[@LINE+7]]:11: error: duplicate name `Class` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: interface Class { }
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_name_conflict_with_class.carbon:[[@LINE-5]]:1: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: class Class;
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
interface Class { }
// CHECK:STDOUT: --- fail_redefine_without_dependents.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Interface.type.283524.1: type = facet_type <@Interface.loc4> [concrete]
// CHECK:STDOUT: %Self.3ce02d.1: %Interface.type.283524.1 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.type.283524.2: type = facet_type <@Interface.loc13> [concrete]
// CHECK:STDOUT: %Self.3ce02d.2: %Interface.type.283524.2 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F.type: type = fn_type @Interface.WithSelf.F, @Interface.WithSelf.loc13(%Self.3ce02d.2) [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F: %Interface.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %Interface.assoc_type: type = assoc_entity_type @Interface.loc13 [concrete]
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, @Interface.WithSelf.loc13.%Interface.WithSelf.F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Interface = %Interface.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Interface.decl.loc4: type = interface_decl @Interface.loc4 [concrete = constants.%Interface.type.283524.1] {} {}
// CHECK:STDOUT: %Interface.decl.loc13: type = interface_decl @Interface.loc13 [concrete = constants.%Interface.type.283524.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc4 {
// CHECK:STDOUT: %Self: %Interface.type.283524.1 = symbolic_binding Self, 0 [symbolic = constants.%Self.3ce02d.1]
// CHECK:STDOUT: %Interface.WithSelf.decl = interface_with_self_decl @Interface.loc4 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc13 {
// CHECK:STDOUT: %Self: %Interface.type.283524.2 = symbolic_binding Self, 0 [symbolic = constants.%Self.3ce02d.2]
// CHECK:STDOUT: %Interface.WithSelf.decl = interface_with_self_decl @Interface.loc13 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Interface.WithSelf.F.decl: @Interface.WithSelf.loc13.%Interface.WithSelf.F.type (%Interface.WithSelf.F.type) = fn_decl @Interface.WithSelf.F [symbolic = @Interface.WithSelf.loc13.%Interface.WithSelf.F (constants.%Interface.WithSelf.F)] {} {}
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, %Interface.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @Interface.WithSelf.loc13.%assoc0
// CHECK:STDOUT: witness = (@Interface.WithSelf.loc13.%Interface.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Interface.WithSelf.F(@Interface.loc13.%Self: %Interface.type.283524.2) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.loc4(constants.%Self.3ce02d.1) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.loc13(constants.%Self.3ce02d.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.F(constants.%Self.3ce02d.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redefine_with_dependents.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Interface.type.283524.1: type = facet_type <@Interface.loc4> [concrete]
// CHECK:STDOUT: %Self.3ce02d.1: %Interface.type.283524.1 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.type.283524.2: type = facet_type <@Interface.loc13> [concrete]
// CHECK:STDOUT: %Self.3ce02d.2: %Interface.type.283524.2 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self.3ce02d.2 [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F.type: type = fn_type @Interface.WithSelf.F, @Interface.WithSelf.loc13(%Self.3ce02d.2) [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F: %Interface.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %Interface.assoc_type: type = assoc_entity_type @Interface.loc13 [concrete]
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, @Interface.WithSelf.loc13.%Interface.WithSelf.F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Interface = %Interface.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Interface.decl.loc4: type = interface_decl @Interface.loc4 [concrete = constants.%Interface.type.283524.1] {} {}
// CHECK:STDOUT: %Interface.decl.loc13: type = interface_decl @Interface.loc13 [concrete = constants.%Interface.type.283524.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc4 {
// CHECK:STDOUT: %Self: %Interface.type.283524.1 = symbolic_binding Self, 0 [symbolic = constants.%Self.3ce02d.1]
// CHECK:STDOUT: %Interface.WithSelf.decl = interface_with_self_decl @Interface.loc4 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc13 {
// CHECK:STDOUT: %Self: %Interface.type.283524.2 = symbolic_binding Self, 0 [symbolic = constants.%Self.3ce02d.2]
// CHECK:STDOUT: %Interface.WithSelf.decl = interface_with_self_decl @Interface.loc13 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Interface.WithSelf.F.decl: @Interface.WithSelf.loc13.%Interface.WithSelf.F.type (%Interface.WithSelf.F.type) = fn_decl @Interface.WithSelf.F [symbolic = @Interface.WithSelf.loc13.%Interface.WithSelf.F (constants.%Interface.WithSelf.F)] {
// CHECK:STDOUT: %self.param_patt: @Interface.WithSelf.F.%pattern_type (%pattern_type) = value_param_pattern [concrete]
// CHECK:STDOUT: %self.patt: @Interface.WithSelf.F.%pattern_type (%pattern_type) = at_binding_pattern self, %self.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @Interface.WithSelf.F.%Self.as_type.loc14_8.1 (%Self.as_type) = value_param call_param0
// CHECK:STDOUT: %.loc14_8.1: type = splice_block %.loc14_8.2 [symbolic = %Self.as_type.loc14_8.1 (constants.%Self.as_type)] {
// CHECK:STDOUT: %Self.ref: %Interface.type.283524.2 = name_ref Self, @Interface.loc13.%Self [symbolic = %Self (constants.%Self.3ce02d.2)]
// CHECK:STDOUT: %Self.as_type.loc14_8.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc14_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %.loc14_8.2: type = converted %Self.ref, %Self.as_type.loc14_8.2 [symbolic = %Self.as_type.loc14_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @Interface.WithSelf.F.%Self.as_type.loc14_8.1 (%Self.as_type) = value_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, %Interface.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @Interface.WithSelf.loc13.%assoc0
// CHECK:STDOUT: witness = (@Interface.WithSelf.loc13.%Interface.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Interface.WithSelf.F(@Interface.loc13.%Self: %Interface.type.283524.2) {
// CHECK:STDOUT: %Self: %Interface.type.283524.2 = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.3ce02d.2)]
// CHECK:STDOUT: %Self.as_type.loc14_8.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc14_8.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type.loc14_8.1 [symbolic = %pattern_type (constants.%pattern_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @Interface.WithSelf.F.%Self.as_type.loc14_8.1 (%Self.as_type));
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.loc4(constants.%Self.3ce02d.1) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.loc13(constants.%Self.3ce02d.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.F(constants.%Self.3ce02d.2) {
// CHECK:STDOUT: %Self => constants.%Self.3ce02d.2
// CHECK:STDOUT: %Self.as_type.loc14_8.1 => constants.%Self.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_name_conflict_with_fn.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Function.type.b68: type = fn_type @Function.loc4 [concrete]
// CHECK:STDOUT: %Function: %Function.type.b68 = struct_value () [concrete]
// CHECK:STDOUT: %Function.type.186: type = facet_type <@Function.loc13> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Function = %Function.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Function.decl.loc4: %Function.type.b68 = fn_decl @Function.loc4 [concrete = constants.%Function] {} {}
// CHECK:STDOUT: %Function.decl.loc13: type = interface_decl @Function.loc13 [concrete = constants.%Function.type.186] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Function.loc13;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Function.loc4();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_name_conflict_with_class.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Class: type = class_type @Class.loc2 [concrete]
// CHECK:STDOUT: %Class.type: type = facet_type <@Class.loc11> [concrete]
// CHECK:STDOUT: %Self: %Class.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Class = %Class.decl.loc2
// CHECK:STDOUT: }
// CHECK:STDOUT: %Class.decl.loc2: type = class_decl @Class.loc2 [concrete = constants.%Class] {} {}
// CHECK:STDOUT: %Class.decl.loc11: type = interface_decl @Class.loc11 [concrete = constants.%Class.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Class.loc11 {
// CHECK:STDOUT: %Self: %Class.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %Class.WithSelf.decl = interface_with_self_decl @Class.loc11 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Class.loc2;
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Class.WithSelf(constants.%Self) {}
// CHECK:STDOUT:
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