[Issue 19059] Invalid integer literal 08 and 09 allowed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19059

--- Comment #7 from Hiroki Noda <kubo39 at gmail.com> ---
I created another issue for invalid octal literals `01` through `07`.
https://issues.dlang.org/show_bug.cgi?id=19070

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