Hmm, but now it reads as "new expression", as if in contrast to some "old expression". To me, this looks confusing compared to "new expression" with proper \tcode highlighting of the keyword.

That's true. We use plain-text "new expression" a couple of times, though. Maybe they should all be \grammarterm{new-expression}?

Maybe they should all be \grammarterm{new-expression}?

Sounds like a better resolution to me. 👍

zygoloid: "It's semantic rather than syntactic, so no \tcode."

This was referring to the phrase "placement new", not to the phrase "new expression". But I note that we don't ever define what a "placement new" actually is; we should add such a definition to [expr.new]p13 (...; such an expression is called a \defn{placement \grammarterm{new-expression}}.), and then consistently format uses of the term the same way we format the definition.

"new expression" should either be \tcode{new} expression or \grammarterm{new-expression}; the latter seems more precise, and I'd prefer that.

I'm retracting this PR.