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carbon-lang/toolchain/check/testdata/where_expr/designator.carbon
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Dana Jansens fe020ee08b Make FacetAccessType evaluate to SymbolicBindingType for type-of a BindSymbolicName (#6115) 
The SymbolicBindingType refers to the type value that will be
substituted in for the BindSymbolicName, but holds onto the EntityNameId
from the BindSymbolicName instead of (or in addition to, for now) the
instruction.

The EntityNameId will be used to look in the ScopeStack to find the
witnesses either from the BindSymbolicName instruction, or other
instructions that specify `impls` constraints against the EntityName.

This will allow us to have the `T` in `I(T)` resolve to a `.Self`
reference in the type so that we get type equality with the binding's
type: `T:! I(.Self)`.
2025-10-06 18:56:43 +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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/where_expr/designator.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/where_expr/designator.carbon
// --- success.carbon
library "[[@TEST_NAME]]";
interface I {
let Member:! type;
}
//@dump-sem-ir-begin
fn PeriodSelf(T:! I where .Self == ());
fn PeriodMember(U:! I where .Member == ());
fn TypeSelfImpls(V:! type where .Self impls I);
//@dump-sem-ir-end
// --- fail_wrong_member.carbon
library "[[@TEST_NAME]]";
interface J {
let Member:! type;
}
// CHECK:STDERR: fail_wrong_member.carbon:[[@LINE+4]]:31: error: member name `Mismatch` not found in `J` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: fn PeriodMismatch(W:! J where .Mismatch = {});
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
fn PeriodMismatch(W:! J where .Mismatch = {});
// --- fail_designator_matches_var.carbon
library "[[@TEST_NAME]]";
fn Foo() -> () {
var x: ();
// CHECK:STDERR: fail_designator_matches_var.carbon:[[@LINE+5]]:10: error: name `.Self` not found [NameNotFound]
// CHECK:STDERR: return .x;
// CHECK:STDERR: ^~
// CHECK:STDERR: fail_designator_matches_var.carbon: note: designator may only be used when `.Self` is in scope [NoPeriodSelfForDesignator]
// CHECK:STDERR:
return .x;
}
// --- fail_unknown_designator.carbon
library "[[@TEST_NAME]]";
fn Bar() -> () {
// CHECK:STDERR: fail_unknown_designator.carbon:[[@LINE+5]]:10: error: name `.Self` not found [NameNotFound]
// CHECK:STDERR: return .undef;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_unknown_designator.carbon: note: designator may only be used when `.Self` is in scope [NoPeriodSelfForDesignator]
// CHECK:STDERR:
return .undef;
}
// --- fail_dot_self_method_return_value.carbon
library "[[@TEST_NAME]]";
class C {
// CHECK:STDERR: fail_dot_self_method_return_value.carbon:[[@LINE+4]]:27: error: name `.Self` not found [NameNotFound]
// CHECK:STDERR: fn F() -> Self { return .Self; }
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
fn F() -> Self { return .Self; }
}
// --- fail_dot_self_method_return_type.carbon
library "[[@TEST_NAME]]";
class D {
// CHECK:STDERR: fail_dot_self_method_return_type.carbon:[[@LINE+4]]:13: error: name `.Self` not found [NameNotFound]
// CHECK:STDERR: fn G() -> .Self { return Self; }
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
fn G() -> .Self { return Self; }
}
// --- todo_fail_impls_constraint_does_not_constrain_self.carbon
library "[[@TEST_NAME]]";
interface I {}
// TODO: Diagnose that the `where` on `T` does not refer to `.Self` at all.
// See https://docs.carbon-lang.dev/docs/design/generics/details.html#constraints-must-use-a-designator
fn F(U:! type, T:! type where U impls I) {}
// --- todo_fail_equality_constraint_does_not_constrain_self.carbon
library "[[@TEST_NAME]]";
interface I {
let X:! type;
}
// TODO: Diagnose that the `where` on `T` does not refer to `.Self` at all.
// See https://docs.carbon-lang.dev/docs/design/generics/details.html#constraints-must-use-a-designator
fn F(U:! I, T:! type where U.X == ()) {}
// --- todo_fail_combined_constraint_does_not_constrain_self.carbon
library "[[@TEST_NAME]]";
interface I {
let X:! type;
}
// TODO: Diagnose that the `where` on `T` does not refer to `.Self` at all.
// See https://docs.carbon-lang.dev/docs/design/generics/details.html#constraints-must-use-a-designator
fn F(U:! I, T:! type where U impls I and U.X == ()) {}
// --- impls_constraint_does_constrain_self.carbon
library "[[@TEST_NAME]]";
interface I(T:! type) {}
class C(T:! type);
fn F(T:! type where C(.Self) impls I(())) {}
fn G(T:! type where C(()) impls I(.Self)) {}
// CHECK:STDOUT: --- success.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%Member [concrete]
// CHECK:STDOUT: %.Self.364: %I.type = bind_symbolic_name .Self [symbolic_self]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %I_where.type: type = facet_type <@I where TODO> [concrete]
// CHECK:STDOUT: %T: %I_where.type = bind_symbolic_name T, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.917: type = pattern_type %I_where.type [concrete]
// CHECK:STDOUT: %PeriodSelf.type: type = fn_type @PeriodSelf [concrete]
// CHECK:STDOUT: %PeriodSelf: %PeriodSelf.type = struct_value () [concrete]
// CHECK:STDOUT: %.Self.binding.as_type: type = symbolic_binding_type .Self, %.Self.364 [symbolic_self]
// CHECK:STDOUT: %I.lookup_impl_witness: <witness> = lookup_impl_witness %.Self.364, @I [symbolic_self]
// CHECK:STDOUT: %impl.elem0: type = impl_witness_access %I.lookup_impl_witness, element0 [symbolic_self]
// CHECK:STDOUT: %U: %I_where.type = bind_symbolic_name U, 0 [symbolic]
// CHECK:STDOUT: %PeriodMember.type: type = fn_type @PeriodMember [concrete]
// CHECK:STDOUT: %PeriodMember: %PeriodMember.type = struct_value () [concrete]
// CHECK:STDOUT: %.Self.644: type = bind_symbolic_name .Self [symbolic_self]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls @I> [concrete]
// CHECK:STDOUT: %V: %type_where = bind_symbolic_name V, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.09a: type = pattern_type %type_where [concrete]
// CHECK:STDOUT: %TypeSelfImpls.type: type = fn_type @TypeSelfImpls [concrete]
// CHECK:STDOUT: %TypeSelfImpls: %TypeSelfImpls.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %PeriodSelf.decl: %PeriodSelf.type = fn_decl @PeriodSelf [concrete = constants.%PeriodSelf] {
// CHECK:STDOUT: %T.patt: %pattern_type.917 = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc9_21.1: type = splice_block %.loc9_21.2 [concrete = constants.%I_where.type] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.Self.ref: %I.type = name_ref .Self, %.Self.2 [symbolic_self = constants.%.Self.364]
// CHECK:STDOUT: %.loc9_37: %empty_tuple.type = tuple_literal ()
// CHECK:STDOUT: %.loc9_21.2: type = where_expr %.Self.2 [concrete = constants.%I_where.type] {
// CHECK:STDOUT: requirement_base_facet_type constants.%I.type
// CHECK:STDOUT: requirement_equivalent %.Self.ref, %.loc9_37
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc9_15.2: %I_where.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_15.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %PeriodMember.decl: %PeriodMember.type = fn_decl @PeriodMember [concrete = constants.%PeriodMember] {
// CHECK:STDOUT: %U.patt: %pattern_type.917 = symbolic_binding_pattern U, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc11_23.1: type = splice_block %.loc11_23.2 [concrete = constants.%I_where.type] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.Self.ref: %I.type = name_ref .Self, %.Self.2 [symbolic_self = constants.%.Self.364]
// CHECK:STDOUT: %Member.ref: %I.assoc_type = name_ref Member, @Member.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT: %.loc11_29: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT: %impl.elem0: type = impl_witness_access constants.%I.lookup_impl_witness, element0 [symbolic_self = constants.%impl.elem0]
// CHECK:STDOUT: %.loc11_41: %empty_tuple.type = tuple_literal ()
// CHECK:STDOUT: %.loc11_23.2: type = where_expr %.Self.2 [concrete = constants.%I_where.type] {
// CHECK:STDOUT: requirement_base_facet_type constants.%I.type
// CHECK:STDOUT: requirement_equivalent %impl.elem0, %.loc11_41
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %U.loc11_17.2: %I_where.type = bind_symbolic_name U, 0 [symbolic = %U.loc11_17.1 (constants.%U)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %TypeSelfImpls.decl: %TypeSelfImpls.type = fn_decl @TypeSelfImpls [concrete = constants.%TypeSelfImpls] {
// CHECK:STDOUT: %V.patt: %pattern_type.09a = symbolic_binding_pattern V, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc13_27.1: type = splice_block %.loc13_27.2 [concrete = constants.%type_where] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.Self.ref: type = name_ref .Self, %.Self.2 [symbolic_self = constants.%.Self.644]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: %.loc13_27.2: type = where_expr %.Self.2 [concrete = constants.%type_where] {
// CHECK:STDOUT: requirement_base_facet_type type
// CHECK:STDOUT: requirement_impls %.Self.ref, %I.ref
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %V.loc13_18.2: %type_where = bind_symbolic_name V, 0 [symbolic = %V.loc13_18.1 (constants.%V)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @PeriodSelf(%T.loc9_15.2: %I_where.type) {
// CHECK:STDOUT: %T.loc9_15.1: %I_where.type = bind_symbolic_name T, 0 [symbolic = %T.loc9_15.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @PeriodMember(%U.loc11_17.2: %I_where.type) {
// CHECK:STDOUT: %U.loc11_17.1: %I_where.type = bind_symbolic_name U, 0 [symbolic = %U.loc11_17.1 (constants.%U)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @TypeSelfImpls(%V.loc13_18.2: %type_where) {
// CHECK:STDOUT: %V.loc13_18.1: %type_where = bind_symbolic_name V, 0 [symbolic = %V.loc13_18.1 (constants.%V)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @PeriodSelf(constants.%T) {
// CHECK:STDOUT: %T.loc9_15.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @PeriodMember(constants.%U) {
// CHECK:STDOUT: %U.loc11_17.1 => constants.%U
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @TypeSelfImpls(constants.%V) {
// CHECK:STDOUT: %V.loc13_18.1 => constants.%V
// CHECK:STDOUT: }
// CHECK:STDOUT:
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