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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>
24 lines
914 B
C++
24 lines
914 B
C++
// 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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#ifndef CARBON_TOOLCHAIN_CHECK_UNUSED_H_
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#define CARBON_TOOLCHAIN_CHECK_UNUSED_H_
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#include "toolchain/check/context.h"
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#include "toolchain/check/scope_stack.h"
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namespace Carbon::Check {
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// Checks for an unused binding. We track whether a name was declared in a
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// reachable position, and whether it was used (even in unreachable code), to
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// decide whether to warn. If a name is used in unreachable code, we don't warn
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// because changing it to `_` would be a name lookup error in that unreachable
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// code.
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auto CheckUnusedBinding(Context& context, SemIR::NameId name_id,
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const LexicalLookup::Result& result) -> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_UNUSED_H_
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