integer literal specification and implementation differs

[dlangBugzillaToGithub]

berni44 (@berni44) reported this on 2019-12-14T10:31:27Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=20449

CC List

• Walter Bright (@WalterBright)

Description

void main()
{
    auto x = 9223372036854775808; // long.max + 1
}

compilation fails, but specs on https://dlang.org/spec/lex.html#integerliteral tell, that it will not.

See https://forum.dlang.org/post/unesuebhxinmoqzhzhbb@forum.dlang.org

[dlangBugzillaToGithub]

dlang-bot commented on 2019-12-14T21:25:56Z

@dkorpel updated dlang/dmd pull request #10673 "Fix 20449 - integer literal specification and implementation differs" fixing this issue:

- fix issue 20449 - integer literal specification and implementation differs

https://github.com/dlang/dmd/pull/10673

[dlangBugzillaToGithub]

bugzilla (@WalterBright) commented on 2019-12-16T07:29:47Z

Because it's been implemented this way for 19 years now, and the compiler behavior matches C, I recommend that the spec change rather than the compiler.

[dlangBugzillaToGithub]

bugzilla (@WalterBright) commented on 2019-12-16T07:46:52Z

I changed this to a spec bug, rather than a compiler bug.

[dlangBugzillaToGithub]

bugzilla (@WalterBright) commented on 2019-12-16T07:59:37Z

(In reply to Walter Bright from comment #3)
> I changed this to a spec bug, rather than a compiler bug.

Nitpicking, but: It was a spec bug from the very beginning and I was surprised to see an implementation fix PR...