Daniel Shahaf wrote on Sat, Dec 21, 2019 at 11:09:39 +0000: > * What was the outcome of this action? > > When the file iota is viewed with «set filetype=foo», the words "lorem > ipsum" on line 1 are not highlighted. > > * What outcome did you expect instead? > > I expected those two words on line 1 to be highlighted (via the chain > TOP -> fooBlock -> @bar -> barBlock -> barKeyword). > > I note that if contains=TOP is either removed, or changed to > contains=@bar, then the words on line 1 do get highlighted. However, > either of these changes would break the highlighting of ft=bar files.
Changing contains=TOP to contains=barKeyword also causes the words on line 1 to be highlighted. Since «:help syn-contains» defines "TOP" as "all groups that aren't 'contained'", and barKeyword isn't 'contained', I would have expected contains=TOP to imply contains=barKeyword. > It seems to me that when «contains=TOP» is encountered in a > :syn-include'd file, it's taken as a reference to the actual top-level, > i.e., the top of foo.vim, rather than as a reference to the top of the > included syntax's scope, i.e., the syntax match or region that did > «contains=@bar». According to syntax.c:in_id_list(), "TOP" is indeed supposed to only accept groups that are defined in the same file (i.e., bar.vim). Cheers, Daniel
