Update runtime files.
diff --git a/runtime/syntax/j.vim b/runtime/syntax/j.vim
index 20063a2..bde9545 100644
--- a/runtime/syntax/j.vim
+++ b/runtime/syntax/j.vim
@@ -2,7 +2,7 @@
" Language: J
" Maintainer: David Bürgin <676c7473@gmail.com>
" URL: https://github.com/glts/vim-j
-" Last Change: 2014-04-05
+" Last Change: 2014-05-25
if exists('b:current_syntax')
finish
@@ -46,7 +46,7 @@
" All in all, a compromise between correctness and practicality had to be
" made. See http://www.jsoftware.com/help/dictionary/dcons.htm for reference.
syntax match jNumber /\<_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%(\%(r_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%([px]_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%(r_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\)\=\)\=\)\|\%(\%(j\|a[dr]\)_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%([px]_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%(\%(j\|a[dr]\)_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\)\=\)\=\)\|\%([px]_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\%(\%(j\|a[dr]\|r\)_\=\d\+\%(\.\d*\)\=\%([eE]_\=\d\+\)\=\)\=\)\)\=/
-syntax match jNumber /\<_\=\d\+\%([eE]\d\+\)\=b_\=[0-9a-z]\+/
+syntax match jNumber /\<_\=\d\+\%([eE]\d\+\)\=b_\=[0-9a-z]\+\%(\.[0-9a-z]\+\)\=/
syntax match jNumber /\<__\=\>/
syntax match jNumber /\<_\./
syntax match jNumber /\<_\=\d\+x\>/
@@ -64,15 +64,20 @@
syntax match jCopula /=[.:]/
syntax match jConjunction /;\.\|\^:\|![.:]/
-" Explicit noun definition. The difficulty is that the define expression
-" "0 : 0" can occur in the middle of a line but the jNounDefine region must
-" only start on the next line. The trick is to split the problem into two
-" regions and link them with "nextgroup=".
+" Explicit noun definition. The difficulty is that the define expression can
+" occur in the middle of a line but the jNounDefine region must only start on
+" the next line. The trick is to split the problem into two regions and link
+" them with "nextgroup=". The fold wrapper provides syntax folding.
+syntax region jNounDefineFold
+ \ matchgroup=NONE start=/\<\%(\%(0\|noun\)\s\+\%(\:\s*0\|def\s\+0\|define\)\>\)\@=/
+ \ keepend matchgroup=NONE end=/^\s*)\s*$/
+ \ contains=jNounDefineStart
+ \ fold
syntax region jNounDefineStart
\ matchgroup=jDefineExpression start=/\<\%(0\|noun\)\s\+\%(\:\s*0\|def\s\+0\|define\)\>/
\ keepend matchgroup=NONE end=/$/
\ contains=@jStdlibItems,@jPrimitiveItems,jNumber,jString,jParenGroup,jParen,jComment
- \ oneline skipempty nextgroup=jDefineEnd,jNounDefine
+ \ contained oneline skipempty nextgroup=jDefineEnd,jNounDefine
" These two items must have "contained", which allows them to match only after
" jNounDefineStart thanks to the "nextgroup=" above.
syntax region jNounDefine
@@ -87,6 +92,7 @@
\ matchgroup=jDefineExpression start=/\<\%([1-4]\|13\|adverb\|conjunction\|verb\|monad\|dyad\)\s\+\%(:\s*0\|def\s\+0\|define\)\>/
\ matchgroup=jDefineEnd end=/^\s*)\s*$/
\ contains=jControl,@jStdlibItems,@jPrimitiveItems,jNumber,jString,jArgument,jParenGroup,jParen,jComment,jDefineMonadDyad
+ \ fold
syntax match jDefineMonadDyad contained /^\s*:\s*$/
" Paired parentheses. When a jDefineExpression such as "3 : 0" is