2cb2cd242c
C89 allowed a type specifier to be elided with the resulting type being int, aka implicit int behavior. This feature was subsequently removed in C99 without a deprecation period, so implementations continued to support the feature. Now, as with implicit function declarations, is a good time to reevaluate the need for this support. This patch allows -Wimplicit-int to issue warnings in C89 mode (off by default), defaults the warning to an error in C99 through C17, and disables support for the feature entirely in C2x. It also removes a warning about missing declaration specifiers that really was just an implicit int warning in disguise and other minor related cleanups.
41 lines
2.0 KiB
C++
41 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++2b %s -verify
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auto LL0 = [] {};
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auto LL1 = []() {};
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auto LL2 = []() mutable {};
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auto LL3 = []() constexpr {};
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auto L0 = [] constexpr {};
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auto L1 = [] mutable {};
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auto L2 = [] noexcept {};
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auto L3 = [] constexpr mutable {};
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auto L4 = [] mutable constexpr {};
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auto L5 = [] constexpr mutable noexcept {};
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auto L6 = [s = 1] mutable {};
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auto L7 = [s = 1] constexpr mutable noexcept {};
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auto L8 = [] -> bool { return true; };
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auto L9 = []<typename T> { return true; };
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auto L10 = []<typename T> noexcept { return true; };
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auto L11 = []<typename T> -> bool { return true; };
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auto L12 = [] consteval {};
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auto L13 = []() requires true {};
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auto L14 = []<auto> requires true() requires true {};
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auto L15 = []<auto> requires true noexcept {};
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auto L16 = [] [[maybe_unused]]{};
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auto XL0 = [] mutable constexpr mutable {}; // expected-error{{cannot appear multiple times}}
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auto XL1 = [] constexpr mutable constexpr {}; // expected-error{{cannot appear multiple times}}
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auto XL2 = []) constexpr mutable constexpr {}; // expected-error{{expected body of lambda expression}}
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auto XL3 = []( constexpr mutable constexpr {}; // expected-error{{invalid storage class specifier}} \
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// expected-error{{function parameter cannot be constexpr}} \
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// expected-error{{a type specifier is required}} \
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// expected-error{{expected ')'}} \
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// expected-note{{to match this '('}} \
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// expected-error{{expected body}} \
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// expected-warning{{duplicate 'constexpr'}}
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// http://llvm.org/PR49736
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auto XL4 = [] requires true {}; // expected-error{{expected body}}
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auto XL5 = []<auto> requires true requires true {}; // expected-error{{expected body}}
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auto XL6 = []<auto> requires true noexcept requires true {}; // expected-error{{expected body}}
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