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Declares a variable to have automatic storage duration. It is redundant, since automatic storage duration is already the default at block scope, and the auto specifier is not allowed at namespace scope.

void f() {
    auto int x; // equivalent to: int x;
    auto y;     // illegal in C++; legal in C89
auto int z;     // illegal: namespace-scope variable cannot be automatic

In C++11, auto changed meaning completely, and is no longer a storage class specifier, but is instead used for type deduction.

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