c9e46219f3
This implements the following changes: * AutoType retains sugared deduced-as-type. * Template argument deduction machinery analyses the sugared type all the way down. It would previously lose the sugar on first recursion. * Undeduced AutoType will be properly canonicalized, including the constraint template arguments. * Remove the decltype node created from the decltype(auto) deduction. As a result, we start seeing sugared types in a lot more test cases, including some which showed very unfriendly `type-parameter-*-*` types. Signed-off-by: Matheus Izvekov <mizvekov@gmail.com> Reviewed By: rsmith, #libc, ldionne Differential Revision: https://reviews.llvm.org/D110216
44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++20
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enum class N {};
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using Animal = int;
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using AnimalPtr = Animal *;
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using Man = Animal;
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using Dog = Animal;
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namespace variable {
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auto x1 = Animal();
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N t1 = x1; // expected-error {{lvalue of type 'Animal' (aka 'int')}}
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auto x2 = AnimalPtr();
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N t2 = x2; // expected-error {{lvalue of type 'AnimalPtr' (aka 'int *')}}
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auto *x3 = AnimalPtr();
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N t3 = x3; // expected-error {{lvalue of type 'Animal *' (aka 'int *')}}
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// Each variable deduces separately.
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auto x4 = Man(), x5 = Dog();
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N t4 = x4; // expected-error {{lvalue of type 'Man' (aka 'int')}}
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N t5 = x5; // expected-error {{lvalue of type 'Dog' (aka 'int')}}
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} // namespace variable
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namespace function_basic {
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auto f1() { return Animal(); }
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auto x1 = f1();
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N t1 = x1; // expected-error {{lvalue of type 'Animal' (aka 'int')}}
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decltype(auto) f2() { return Animal(); }
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auto x2 = f2();
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N t2 = x2; // expected-error {{lvalue of type 'Animal' (aka 'int')}}
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auto x3 = [a = Animal()] { return a; }();
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N t3 = x3; // expected-error {{lvalue of type 'Animal' (aka 'int')}}
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} // namespace function_basic
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