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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>
33 lines
1011 B
Plaintext
33 lines
1011 B
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/convert.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/impl/lookup/import_final.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/impl/lookup/import_final.carbon
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// --- interface_z.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let X:! type;
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}
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class C {}
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final impl forall [T:! type] T as Z where .X = C {}
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// --- import_final.carbon
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library "[[@TEST_NAME]]";
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import library "interface_z";
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fn F[unused U:! type](T:! Z) {
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// The value of `.X` can be known to be `C` here when the impl `T as Z(C)` is
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// final.
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let unused a: T.X = {} as C;
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}
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