9c4a716c12
This patch improves the preservation of qualifiers and loss of type sugar in TemplateNames. This problem is analogous to https://reviews.llvm.org/D112374 and this patch takes a very similar approach to that patch, except the impact here is much lesser. When a TemplateName was written bare, without qualifications, we wouldn't produce a QualifiedTemplate which could be used to disambiguate it from a Canonical TemplateName. This had effects in the TemplateName printer, which had workarounds to deal with this, and wouldn't print the TemplateName as-written in most situations. There are also some related fixes to help preserve this type sugar along the way into diagnostics, so that this patch can be properly tested. - Fix dropping the template keyword. - Fix type deduction to preserve sugar in TST TemplateNames.
38 lines
1.0 KiB
C++
38 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14
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// <optional>
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// template<class T>
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// optional(T) -> optional<T>;
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#include <optional>
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#include <cassert>
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struct A {};
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int main(int, char**)
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{
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// Test the explicit deduction guides
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// Test the implicit deduction guides
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{
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// optional()
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std::optional opt; // expected-error-re {{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}optional'}}
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}
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{
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// optional(nullopt_t)
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std::optional opt(std::nullopt); // expected-error-re@optional:* {{static assertion failed{{.*}}instantiation of optional with nullopt_t is ill-formed}}
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}
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return 0;
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}
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