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syntax: don't pick up chan chains (channel of channels) #678

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Jan 3, 2016
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syntax: don't pick up chan chains (channel of channels) #678

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12 changes: 10 additions & 2 deletions syntax/go.vim
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Original file line number Diff line number Diff line change
Expand Up @@ -208,9 +208,17 @@ endif
" Spacing errors around the 'chan' keyword
if g:go_highlight_chan_whitespace_error != 0
" receive-only annotation on chan type
syn match goSpaceError display "\(<-\)\@<=\s\+\(chan\>\)\@="
"
" \(\<chan\>\)\@<!<- (only pick arrow when it doesn't come after a chan)
" this prevents picking up 'chan<- chan<-' but not '<- chan'
syn match goSpaceError display "\(\(\<chan\>\)\@<!<-\)\@<=\s\+\(\<chan\>\)\@="

" send-only annotation on chan type
syn match goSpaceError display "\(\<chan\)\@<=\s\+\(<-\)\@="
"
" \(<-\)\@<!\<chan\> (only pick chan when it doesn't come after an arrow)
" this prevents picking up '<-chan <-chan' but not 'chan <-'
syn match goSpaceError display "\(\(<-\)\@<!\<chan\>\)\@<=\s\+\(<-\)\@="

" value-ignoring receives in a few contexts
syn match goSpaceError display "\(\(^\|[={(,;]\)\s*<-\)\@<=\s\+"
endif
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