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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>
49 lines
1.5 KiB
Plaintext
49 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/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/struct.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/struct.carbon
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interface Z {
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let X:! type;
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fn ZZ() -> X;
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}
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class C { adapt (); }
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class D { adapt (); }
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impl {.a: (), .b: ()} as Z where .X = C {
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fn ZZ() -> C { return () as C; }
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}
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// A struct with different field names. Structs with different field names are
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// different types and can be matched by an impl lookup with matching field
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// names.
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impl {.aa: (), .bb: ()} as Z where .X = D {
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fn ZZ() -> D { return () as D; }
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}
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// Structs with different field orders are different types too, for impl
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// lookup. See https://github.com/carbon-language/carbon-lang/issues/5413.
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impl {.b: (), .a: ()} as Z where .X = D {
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fn ZZ() -> D { return () as D; }
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}
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fn F(T:! Z) -> T.X {
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return T.ZZ();
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}
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fn G() {
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// Check which impl is selected for struct literals with different field
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// names.
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let unused c1: C = F({.a: (), .b: ()});
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let unused d1: D = F({.aa: (), .bb: ()});
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let unused d2: D = F({.b: (), .a: ()});
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}
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