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Chandler Carruthandjosh11b
7871237c15
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>
56 lines
2.2 KiB
Plaintext
56 lines
2.2 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
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// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/basics/multi_error.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/basics/multi_error.carbon
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// --- fail_multi_error.carbon
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// When naming insts, the `error` instruction generated is added for naming.
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// This regression test ensures that reuse of `<error>` in different scopes
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// works.
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// CHECK:STDERR: fail_multi_error.carbon:[[@LINE+4]]:8: error: implicit parameters of functions must be constant [ImplictParamMustBeConstant]
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// CHECK:STDERR: fn Foo[a: ()]();
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// CHECK:STDERR: ^~~~~
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// CHECK:STDERR:
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fn Foo[a: ()]();
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// CHECK:STDERR: fail_multi_error.carbon:[[@LINE+4]]:8: error: implicit parameters of functions must be constant [ImplictParamMustBeConstant]
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// CHECK:STDERR: fn Boo[a: ()]() {}
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// CHECK:STDERR: ^~~~~
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// CHECK:STDERR:
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fn Boo[a: ()]() {}
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// CHECK:STDOUT: --- fail_multi_error.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %Foo.type: type = fn_type @Foo [concrete]
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// CHECK:STDOUT: %Foo: %Foo.type = struct_value () [concrete]
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// CHECK:STDOUT: %Boo.type: type = fn_type @Boo [concrete]
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// CHECK:STDOUT: %Boo: %Boo.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .Foo = %Foo.decl
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// CHECK:STDOUT: .Boo = %Boo.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Foo.decl: %Foo.type = fn_decl @Foo [concrete = constants.%Foo] {} {}
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// CHECK:STDOUT: %Boo.decl: %Boo.type = fn_decl @Boo [concrete = constants.%Boo] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Foo();
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Boo() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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