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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>
82 lines
2.7 KiB
Plaintext
82 lines
2.7 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/deduce/symbolic_facets.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/deduce/symbolic_facets.carbon
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// By placing each interface inside a generic class, a facet type refering to
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// the interface becomes symbolic. Normally they would be concrete. This can
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// affect decisions in deduce which unwraps symbolic constants, but still needs to
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// ensure they convert correctly.
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// --- fail_missing_interface.carbon
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library "[[@TEST_NAME]]";
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class C(CC:! type) {
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interface A {}
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fn F(unused T:! A) {}
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}
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class D(DD:! type) {
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interface B {}
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fn G(T:! B) {
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// T only implements D(DD).B, so should not convert to a facet value
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// implementing C(()).A.
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//
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// CHECK:STDERR: fail_missing_interface.carbon:[[@LINE+7]]:5: error: cannot convert type `T` that implements `B` into type implementing `A` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: C(()).F(T);
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// CHECK:STDERR: ^~~~~~~~~~
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// CHECK:STDERR: fail_missing_interface.carbon:[[@LINE-12]]:3: note: while deducing parameters of generic declared here [DeductionGenericHere]
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// CHECK:STDERR: fn F(unused T:! A) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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C(()).F(T);
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}
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}
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// --- fail_interface_wrong_generic_param.carbon
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library "[[@TEST_NAME]]";
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class C(CC:! type) {
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interface A {}
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fn F(unused T:! A) {}
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}
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class D(DD:! type) {
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interface B {}
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fn G(T:! B & C({}).A) {
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// T implements C({}).A and D(DD).B, so should not convert to a facet value
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// implementing C(()).A.
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//
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// CHECK:STDERR: fail_interface_wrong_generic_param.carbon:[[@LINE+7]]:5: error: cannot convert type `T` that implements `A & B` into type implementing `A` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: C(()).F(T);
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// CHECK:STDERR: ^~~~~~~~~~
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// CHECK:STDERR: fail_interface_wrong_generic_param.carbon:[[@LINE-12]]:3: note: while deducing parameters of generic declared here [DeductionGenericHere]
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// CHECK:STDERR: fn F(unused T:! A) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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C(()).F(T);
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}
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}
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// --- compatible_deduce.carbon
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library "[[@TEST_NAME]]";
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class C(CC:! type) {
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interface A {}
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fn F(unused T:! A) {}
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}
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class D(DD:! type) {
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interface B {}
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fn G(T:! B & C(()).A) {
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C(()).F(T);
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}
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}
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