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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
dd7cfdb149
Implement the alias rules from proposal #5389, wherein an alias is permitted so long as the target has a constant value. While that proposal is not yet accepted, this seems like a reasonable basis for further iteration, and will be useful for the examples we're currently pursuing.
78 lines
2.4 KiB
Plaintext
78 lines
2.4 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/destroy.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/alias/var.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/alias/var.carbon
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// --- global.carbon
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library "[[@TEST_NAME]]";
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var a: () = ();
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fn F() -> () {
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//@dump-sem-ir-begin
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// TODO: Decide if this should be allowed, and if so, whether it should be
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// spelled as
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//
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// alias b = ref a;
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alias b = a;
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//@dump-sem-ir-end
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return b;
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}
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// --- fail_local.carbon
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library "[[@TEST_NAME]]";
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fn F() -> () {
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var a: () = ();
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//@dump-sem-ir-begin
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// CHECK:STDERR: fail_local.carbon:[[@LINE+4]]:13: error: alias refers to a runtime value [AliasRequiresConstantValue]
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// CHECK:STDERR: alias b = a;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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alias b = a;
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//@dump-sem-ir-end
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return b;
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}
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// CHECK:STDOUT: --- global.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> out %return.param: %empty_tuple.type {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %a.ref: ref %empty_tuple.type = name_ref a, file.%a [concrete = file.%a.var]
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// CHECK:STDOUT: %b: ref %empty_tuple.type = alias_binding b, %a.ref [concrete = file.%a.var]
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @__global_init() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_local.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> out %return.param: %empty_tuple.type {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: %a.ref: ref %empty_tuple.type = name_ref a, %a
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// CHECK:STDOUT: %b: ref %empty_tuple.type = alias_binding b, %a.ref
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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