[Issue 19246] Binary literal `0b_` allowed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19246

--- Comment #2 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/dlang.org

https://github.com/dlang/dlang.org/commit/cc0fc1260a90afe4a68d2555986e9c529c19945f
update spec for issue 19246

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