Compiler Error C3540
'type': sizeof cannot be applied to a type that contains 'auto'
The sizeof operator cannot be applied to the indicated type because it contains the auto specifier.
Example
The following example yields C3540.
// C3540.cpp
// Compile with /Zc:auto
int main() {
auto x = 123;
sizeof(x); // OK
sizeof(auto); // C3540
return 0;
}