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Richard Smith
d60900cbeb
When returning a value from a function whose return type has a by-copy initializing representation, perform initialization like we do when the return type has an in-place initializing representation. This makes our SemIR representation more uniform, as the return expression will now always be an initializing expression rather than a value expression, but more importantly it means that attempts to return a non-copyable type by value now fail, even if the type has a by-copy initializing representation. This catches a bunch of places where we were returning a value of an unconstrained template parameter `T:! type`, which we were incorrectly allowing because we didn't notice it was not copyable. Unfortunately this then requires quite a few test updates. Like #6034, this exposes a lowering issue where lowering crashes when attempting to lower a specific copy operation for certain types; a couple more tests are temporarily disabled here. An upcoming PR dependent on this one will fix the issue and re-enable those tests.
51 lines
1.5 KiB
Plaintext
51 lines
1.5 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/int.carbon
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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/function/generic/undefined.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/function/generic/undefined.carbon
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// --- call_defined.carbon
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library "[[@TEST_NAME]]";
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fn Defined[T:! type](x: T) {}
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fn CallDefined() {
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Defined(0 as i32);
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}
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// --- call_defined_late.carbon
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library "[[@TEST_NAME]]";
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fn Defined[T:! type](x: T);
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fn CallDefined() {
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Defined(0 as i32);
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}
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fn Defined[T:! type](x: T) {}
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// --- fail_call_undefined.carbon
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library "[[@TEST_NAME]]";
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fn Undefined[T:! type](x: T);
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fn CallUndefined() {
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// CHECK:STDERR: fail_call_undefined.carbon:[[@LINE+7]]:3: error: use of undefined generic function [MissingGenericFunctionDefinition]
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// CHECK:STDERR: Undefined(0 as i32);
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// CHECK:STDERR: ^~~~~~~~~
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// CHECK:STDERR: fail_call_undefined.carbon:[[@LINE-6]]:1: note: generic function declared here [MissingGenericFunctionDefinitionHere]
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// CHECK:STDERR: fn Undefined[T:! type](x: T);
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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Undefined(0 as i32);
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}
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