rust-mode-character-literal-syntax-table is never used?

[strega-nil]

I don't know, it's defvar'd in line 48, then never mentioned again?

[MicahChalmer]

Oops, that seems to be from my patches. I introduced it in 55080f6 (#2), then later removed/replaced the place where it was used in 6b57bbf (#30) but forgot to remove the variable itself. I believe it can be removed now.