Eslint checker: log if called as a generic frontend.

plugin/syntastic.vim

@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.6.0-172'
+let g:_SYNTASTIC_VERSION = '3.6.0-173'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1

syntax_checkers/javascript/eslint.vim

@@ -26,6 +26,10 @@ let s:save_cpo = &cpo
 set cpo&vim
 
 function! SyntaxCheckers_javascript_eslint_IsAvailable() dict
+    if g:syntastic_javascript_eslint_generic
+        call self.log('generic eslint, exec =', self.getExec())
+    endif
+
     if !executable(self.getExec())
         return 0
     endif