Discarded return value warning does not ignore noreturn if defined locally

[zyedidia]

If I define noreturn as typeof(*null) in the current file or in an included object.d file (using my own custom runtime), then dscanner starts generating warnings that the noreturn value is being discarded.

alias noreturn = typeof(*null);

noreturn foo() {
    while (1) {}
}

noreturn bar() {
    foo(); // warning: function value is discarded
}

If noreturn is not declared locally then it works as expected.