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carbon-lang/toolchain/check/testdata/impl/impl_thunk_min_prelude.carbon
T
Richard Smith cefa0397bb More fixes to package and library fingerprinting. (#7297) 
Fix import logic to make all imported packages be children of the
`NameScopeId::Package` scope. Previously, indirectly-imported packages
would end up as children of their importing package's scope, which
resulted in them not being treated as packages at all, and in particular
not being fingerprinted as packages.

Fixing that caused a failure in the fingerprinting logic as we started
to encounter packages with no correspoding import scopes. Instead of
looking for import scopes, use a simpler mechanism to map packages to
their package names, and clean up.

Unfortunately the latter change churns all the fingerprints again :(
Hopefully this is the last time for a while.
2026-06-04 17:41:46 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/impl_thunk_min_prelude.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/impl_thunk_min_prelude.carbon
// --- convert_in_class.carbon
library "[[@TEST_NAME]]";
interface X(T:! type, U:! type) {
fn F(t: T) -> U;
}
class ConvertsToA {}
class ConvertsToB {}
// Check that we don't try to define a thunk for `A.B.(as X).F` until we reach
// the end of `A`. If we tried earlier, we wouldn't find a conversion from
// `ConvertsToA` to `A` or from `ConvertsToB` to `B`.
class A {
class B {
impl as X(ConvertsToA, B) {
fn F(a: A) -> ConvertsToB;
}
impl ConvertsToB as Core.ImplicitAs(B) {
fn Convert[unused self: Self]() -> B { return {}; }
}
}
impl ConvertsToA as Core.ImplicitAs(A) {
fn Convert[unused self: Self]() -> A { return {}; }
}
}
// --- fail_todo_out_of_line_thunk.carbon
library "[[@TEST_NAME]]";
class Wrap(T:! type) {}
interface OpWith(U:! type) {
fn Op[self: Self](u: U);
}
impl forall [T:! type, U:! Core.ImplicitAs(Wrap(T))] Wrap(T) as OpWith(U) {
// CHECK:STDERR: fail_todo_out_of_line_thunk.carbon:[[@LINE+7]]:3: error: use of undefined generic function [MissingGenericFunctionDefinition]
// CHECK:STDERR: fn Op[self: Self](other: Self);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_out_of_line_thunk.carbon:[[@LINE+4]]:3: note: generic function declared here [MissingGenericFunctionDefinitionHere]
// CHECK:STDERR: fn Op[self: Self](other: Self);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn Op[self: Self](other: Self);
}
// TODO: Once we support the syntax for defining impl members out of line,
// define the above function here.
// fn (forall [T:! type, U:! Core.ImplicitAs(Wrap(T))] Wrap(T) as OpWith(U)).Op[self: Self](other: Self) {}
// --- builtin_thunk.carbon
library "[[@TEST_NAME]]";
class Wrap(T:! type) {}
interface OpWith(U:! type) {
fn Op[self: Self](u: U);
}
impl forall [T:! type, U:! Core.ImplicitAs(Wrap(T))] Wrap(T) as OpWith(U) {
fn Op[self: Self](other: Self) = "no_op";
}
// --- thunk_literal_convert.carbon
library "[[@TEST_NAME]]";
interface Add(T:! type) {
fn Op(a: Self, b: T) -> Self;
}
impl forall [T:! Core.ImplicitAs(i32)] i32 as Add(T) {
fn Op(a: Self, b: Self) -> Self = "int.sadd";
}
fn Call() -> i32 {
let a: i32 = 1;
// The conversion from 2 to IntLiteral here relies on having the
// constant value available, so is only possible if the thunk is
// inlined.
return i32.(Add(Core.IntLiteral()).Op)
//@dump-sem-ir-begin
(a, 2)
//@dump-sem-ir-end
;
}
// CHECK:STDOUT: --- thunk_literal_convert.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %ImplicitAs.type.914: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.845: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.a23: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.b3c, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.2ba: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.2ba = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.914 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.a23) [concrete]
// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.740: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%i32, %ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %.1c5: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.740, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %i32.as.Add.impl.Op.type.79f953.1: type = fn_type @i32.as.Add.impl.Op.loc8_35.1, @i32.as.Add.impl(%ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %i32.as.Add.impl.Op.0c3802.1: %i32.as.Add.impl.Op.type.79f953.1 = struct_value () [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %i32.as.Add.impl.Op.specific_fn.f5e09b.2: <specific function> = specific_function %i32.as.Add.impl.Op.0c3802.1, @i32.as.Add.impl.Op.loc8_35.1(%ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.9f3: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39 [concrete]
// CHECK:STDOUT: %bound_method.3cb: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.295: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.edf: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.845)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.b3c = impl_witness_table (%Core.import_ref.edf), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Call() -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %a.ref: %i32 = name_ref a, %a
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.914 = facet_value Core.IntLiteral, (constants.%ImplicitAs.impl_witness.a23) [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: %.loc18_14.1: %ImplicitAs.type.914 = converted Core.IntLiteral, %ImplicitAs.facet [concrete = constants.%ImplicitAs.facet]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc18_14.2: %i32.as.Add.impl.Op.type.79f953.1 = specific_constant @i32.as.Add.impl.%i32.as.Add.impl.Op.decl.loc8_35.1, @i32.as.Add.impl(constants.%ImplicitAs.facet) [concrete = constants.%i32.as.Add.impl.Op.0c3802.1]
// CHECK:STDOUT: %Op.ref.loc18: %i32.as.Add.impl.Op.type.79f953.1 = name_ref Op, %.loc18_14.2 [concrete = constants.%i32.as.Add.impl.Op.0c3802.1]
// CHECK:STDOUT: %i32.as.Add.impl.Op.specific_fn: <specific function> = specific_function %Op.ref.loc18, @i32.as.Add.impl.Op.loc8_35.1(constants.%ImplicitAs.facet) [concrete = constants.%i32.as.Add.impl.Op.specific_fn.f5e09b.2]
// CHECK:STDOUT: %impl.elem0.loc18: %.1c5 = impl_witness_access constants.%ImplicitAs.impl_witness.a23, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.e39]
// CHECK:STDOUT: %bound_method.loc18_13.1: <bound method> = bound_method %int_2, %impl.elem0.loc18 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.9f3]
// CHECK:STDOUT: %specific_fn.loc18: <specific function> = specific_function %impl.elem0.loc18, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc18_13.2: <bound method> = bound_method %int_2, %specific_fn.loc18 [concrete = constants.%bound_method.3cb]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc18: init %i32 = call %bound_method.loc18_13.2(%int_2) [concrete = constants.%int_2.295]
// CHECK:STDOUT: %.loc18_13.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc18 [concrete = constants.%int_2.295]
// CHECK:STDOUT: %.loc18_13.2: %i32 = converted %int_2, %.loc18_13.1 [concrete = constants.%int_2.295]
// CHECK:STDOUT: %i32.as.Add.impl.Op.call: init %i32 = call %i32.as.Add.impl.Op.specific_fn(%a.ref, %.loc18_13.2)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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