Bug 17426 – "version(none):" cant be overwritten by its counterpart

this test cast should crash at run-time dmd veroverwrite.d -main -unittest veroverwrite.d: --- version(none): unittest {assert(false);} version(all): unittest {assert(false);} // not compiled version(none): unittest {assert(false);} ---

The rule being followed here is: { version(x): ...code... } is equivalent to { version(x) {...code...} } i.e. everything is wrapped until the end of the current scope, or file if at the top level. Thus, your code is equivalent to: version(none) { unittest {assert(false);} version(all) { unittest {assert(false);} // not compiled version(none) { unittest {assert(false);} } } } Making your code work as intuitively expected would mean breaking consistency with the rule (though adding a warning for this to either DMD or DScanner might not be a bad idea).