Initial class construction

Git/usr/share/vim/vim81/syntax/nosyntax.vim

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+" Vim syntax support file
+" Maintainer:	Bram Moolenaar <Bram@vim.org>
+" Last Change:	2006 Apr 16
+
+" This file is used for ":syntax off".
+" It removes the autocommands and stops highlighting for all buffers.
+
+if !has("syntax")
+  finish
+endif
+
+" Remove all autocommands for the Syntax event.  This also avoids that
+" "syntax=foo" in a modeline triggers the SynSet() function of synload.vim.
+au! Syntax
+
+" remove all syntax autocommands and remove the syntax for each buffer
+augroup syntaxset
+  au!
+  au BufEnter * syn clear
+  au BufEnter * if exists("b:current_syntax") | unlet b:current_syntax | endif
+  doautoall syntaxset BufEnter *
+  au!
+augroup END
+
+if exists("syntax_on")
+  unlet syntax_on
+endif
+if exists("syntax_manual")
+  unlet syntax_manual
+endif