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111
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1 // Testcase from P0170R1
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131
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2 // { dg-do compile { target c++17 } }
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111
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3
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4 auto Fwd = [](int (*fp)(int), auto a) { return fp(a); };
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5 auto C = [](auto a) { return a; };
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6 static_assert( Fwd(C ,3) == 3); // OK
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7 // No specialization of the function call operator template can be constexpr
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8 // (because of the local static).
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9 auto NC = [](auto a) { static int s; return a; }; // { dg-error "static" }
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10 // { dg-message "operator int" "" { target *-*-* } .+1 }
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11 static_assert( Fwd(NC ,3) == 3); // { dg-error "" }
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12
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13 // We look for the string "operator int" to check that we aren't trying to do
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14 // template pretty-printing in an expression; that gets incredibly unwieldy
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15 // with the decltype magic we do for lambdas.
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