Miscellaneous Vim improvements #12592
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Just like the bare keyword `crate` is highlighted as Error (a little dubious, actually, given macros), `mod` is invalid after `extern`: it's obsolete syntax.
This means it gets highlighted as Error by default.
(Expressed another way: make `[[` et al. work with the curly brace at the end of a line as is standard Rust style, not just at the start is it is by default in Vim, from K&R style.) This came out of rust-lang#11492, where a simpler but less effective technique was initially proposed; some discussion of the techniques, ways and means can be found there. There are still a few caveats: - Operator-pending mode behaves differently to the standard behaviour: if inside curly braces, it should delete up to and including the closing of the outermost curly brace (that doesn't seem to me consistent with documented behaviour, but it's what it does). Actual behaviour (the more logical and consistent, in my opinion): up to the start of the next outermost curly brace. - With folding enabled (`set fdm=syntax`), `[[` and `]]` do not behave as they should: the default behaviour treats an entire closed fold as one line for these purposes while this code does not (I explicitly `set nofoldenable` in the function—the side-effects are worse with folds enabled), leading to unexpected behaviour, the worst of which is `[[` and/or `]]` not working in visual mode on a closed fold (visual mode keeps it at the extreme end of the region line of the folded region, so it's always going back to the opening line of that fold and immediately being shoved back to the end by visual mode). - `[[` and `]]` are operating inside comments, whereas the standard behaviour skips comments. - The viewport position is sometimes changed when it should not be necessary.
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modinextern mod x;as Error.doto a reserved keyword (i.e. highlight it as Error).[[et al.) for standard Rust style (originally from Update vim section movement mappings to support hanging indents. #11492).