mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-02 17:52:58 +01:00
fdb188ccfd
Implementation of unused pattern bindings #2022, continued. Whereas previous PR #6460 took care of parsing, and PR #6479 prepared the stage by using _ in some test cases, this PR has the the actual implementation, using a simple dataflow analysis. --------- Co-authored-by: Burak Emir <bqe@google.com> Co-authored-by: jonmeow <jperkins@google.com>
40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
// 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
|
|
//
|
|
// AUTOUPDATE
|
|
// TIP: To test this file alone, run:
|
|
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/deduce/where.carbon
|
|
// TIP: To dump output, run:
|
|
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/deduce/where.carbon
|
|
|
|
// --- fail_todo_where.carbon
|
|
library "[[@TEST_NAME]]";
|
|
|
|
interface Z {
|
|
let Z1:! type;
|
|
}
|
|
|
|
class C(unused T:! type) {}
|
|
|
|
fn F[U:! type](unused T:! Z where .Z1 = C(U)) {}
|
|
|
|
class D {}
|
|
final impl () as Z where .Z1 = C(D) {}
|
|
|
|
fn G() {
|
|
// TODO: Should be able to see that ().(Z.Z1) is C(D), so deduce that C(U)
|
|
// is C(D) and U is D.
|
|
//
|
|
// CHECK:STDERR: fail_todo_where.carbon:[[@LINE+7]]:3: error: cannot deduce value for generic parameter `U` [DeductionIncomplete]
|
|
// CHECK:STDERR: F(() as type);
|
|
// CHECK:STDERR: ^~~~~~~~~~~~~
|
|
// CHECK:STDERR: fail_todo_where.carbon:[[@LINE-12]]:1: note: while deducing parameters of generic declared here [DeductionGenericHere]
|
|
// CHECK:STDERR: fn F[U:! type](unused T:! Z where .Z1 = C(U)) {}
|
|
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
// CHECK:STDERR:
|
|
F(() as type);
|
|
}
|