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carbon-lang/toolchain/check/testdata/interface/incomplete.carbon
T
Dana Jansens 0177dc5677 Import contained RequireImpls when importing an Interface or NamedConstraint (#6344) 
When importing an Interface or NamedConstraint, walk the block of
`RequireImplsId`s, and for each one:
- Import the RequireImplsDecl from it, which also imports the
`RequireImpls` structure and its id.
- Collect those decls and build a block of `RequireImplsId`s for the
local SemIR to reference from the Interface or NamedConstraint.

The import of RequireImplsDecl is done in a single phase instead of
three, unlike other decls. This is possible since require declarations
have no name, so they can't be referenced by instructions inside them,
thus there's no cycles to concern ourselves with.
2025-11-14 14:31:11 +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/incomplete.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/incomplete.carbon
// --- fail_incomplete_type.carbon
library "[[@TEST_NAME]]";
class C;
interface I {
// CHECK:STDERR: fail_incomplete_type.carbon:[[@LINE+7]]:11: error: associated constant has incomplete type `C` [IncompleteTypeInAssociatedConstantDecl]
// CHECK:STDERR: let T:! C;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_incomplete_type.carbon:[[@LINE-6]]:1: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: class C;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
let T:! C;
}
// --- fail_incomplete_constraint.carbon
library "[[@TEST_NAME]]";
constraint A;
interface B {
// CHECK:STDERR: fail_incomplete_constraint.carbon:[[@LINE+7]]:17: error: facet type `A` cannot be identified in `require` declaration [RequireImplsUnidentifiedFacetType]
// CHECK:STDERR: require impls A;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_incomplete_constraint.carbon:[[@LINE-6]]:1: note: constraint was forward declared here [NamedConstraintForwardDeclaredHere]
// CHECK:STDERR: constraint A;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
require impls A;
}
// --- incomplete_interface.carbon
library "[[@TEST_NAME]]";
interface A;
interface B {
require impls A;
}
// --- fail_incomplete_interface_in_where.carbon
library "[[@TEST_NAME]]";
interface A;
interface B {
// CHECK:STDERR: fail_incomplete_interface_in_where.carbon:[[@LINE+7]]:25: error: member access into object of incomplete type `A` [IncompleteTypeInMemberAccess]
// CHECK:STDERR: require impls A where .X = {};
// CHECK:STDERR: ^~
// CHECK:STDERR: fail_incomplete_interface_in_where.carbon:[[@LINE-6]]:1: note: interface was forward declared here [InterfaceForwardDeclaredHere]
// CHECK:STDERR: interface A;
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
require impls A where .X = {};
}
// CHECK:STDOUT: --- fail_incomplete_type.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: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%T [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %T: <error> = assoc_const_decl @T [concrete] {
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%T [concrete = constants.%assoc0]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: .T = @T.%assoc0
// CHECK:STDOUT: witness = (%T)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic assoc_const @T(@I.%Self: %I.type) {
// CHECK:STDOUT: assoc_const T:! <error>;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C;
// CHECK:STDOUT:
// CHECK:STDOUT: specific @T(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_incomplete_constraint.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.type: type = facet_type <@A> [concrete]
// CHECK:STDOUT: %B.type: type = facet_type <@B> [concrete]
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: .B = %B.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: type = constraint_decl @A [concrete = constants.%A.type] {} {}
// CHECK:STDOUT: %B.decl: type = interface_decl @B [concrete = constants.%B.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @B {
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .A = <poisoned>
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: constraint @A;
// CHECK:STDOUT:
// CHECK:STDOUT: --- incomplete_interface.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.type: type = facet_type <@A> [concrete]
// CHECK:STDOUT: %B.type: type = facet_type <@B> [concrete]
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: .B = %B.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: type = interface_decl @A [concrete = constants.%A.type] {} {}
// CHECK:STDOUT: %B.decl: type = interface_decl @B [concrete = constants.%B.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @A;
// CHECK:STDOUT:
// CHECK:STDOUT: interface @B {
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %B.require0.decl = require_decl @B.require0 [concrete] {
// CHECK:STDOUT: require %Self.as_type impls <@A>
// CHECK:STDOUT: } {
// CHECK:STDOUT: %Self.as_type: type = facet_access_type @B.%Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %A.ref: type = name_ref A, file.%A.decl [concrete = constants.%A.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .A = <poisoned>
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: @B.require0 {
// CHECK:STDOUT: require @B.require0.%Self.as_type impls <@A>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic require @B.require0(@B.%Self: %B.type) {
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @B.require0(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_incomplete_interface_in_where.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.type: type = facet_type <@A> [concrete]
// CHECK:STDOUT: %B.type: type = facet_type <@B> [concrete]
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: .B = %B.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: type = interface_decl @A [concrete = constants.%A.type] {} {}
// CHECK:STDOUT: %B.decl: type = interface_decl @B [concrete = constants.%B.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @A;
// CHECK:STDOUT:
// CHECK:STDOUT: interface @B {
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .A = <poisoned>
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
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