Consistently use extern(X)

[Bolpat]

Linkage is not a control-flow statement (such as if or while) and as with assert, pragma and many others, no space should be used between the keyword and the opening parenthesis.

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[ntrel]

Makes sense as it is an attribute (though I'm used to seeing a space for it). I think all attributes with a parameter don't use a space, except align ( sometimes.
Related - version and debug sometimes don't have a space in the spec.

[Bolpat]

Makes sense as it is an attribute (though I'm used to seeing a space for it). I think all attributes with a parameter don't use a space, except align ( sometimes.

Honestly, I’m just testing the waters here. If this is being rejected, I’m not trying align either.

Related - version and debug sometimes don't have a space in the spec.

Related, but opposite. version and debug are conditional compilation / code-generation tools like static if and static foreach. Those are suggested by the D Style page to have a space.