break early implicit if return code is not 0.

autoload/airline.vim

@@ -73,7 +73,7 @@ function! airline#get_statusline(winnr, active)
 endfunction
 
 function! airline#update_statusline()
-  if airline#util#exec_funcrefs(g:airline_exclude_funcrefs, 1)
+  if airline#util#exec_funcrefs(g:airline_exclude_funcrefs)
     call setwinvar(winnr(), '&statusline', '')
     return
   endif
@@ -90,7 +90,7 @@ function! airline#update_statusline()
   for section in s:sections
     unlet! w:airline_section_{section}
   endfor
-  call airline#util#exec_funcrefs(g:airline_statusline_funcrefs, 0)
+  call airline#util#exec_funcrefs(g:airline_statusline_funcrefs)
 
   call setwinvar(winnr(), '&statusline', airline#get_statusline(winnr(), 1))
 endfunction

autoload/airline/extensions.vim

@@ -95,7 +95,7 @@ endfunction
 
 function! s:sync_active_winnr()
   if exists('#airline') && winnr() != s:active_winnr
-    if airline#util#exec_funcrefs(s:ext._cursormove_funcrefs, 1)
+    if airline#util#exec_funcrefs(s:ext._cursormove_funcrefs)
       return
     endif
     call airline#update_statusline()
@@ -194,6 +194,6 @@ function! airline#extensions#load()
     endif
   endfor
 
-  call airline#util#exec_funcrefs(g:airline_statusline_funcrefs, 0)
+  call airline#util#exec_funcrefs(g:airline_statusline_funcrefs)
 endfunction
 

autoload/airline/util.vim

@@ -13,29 +13,24 @@ else
 endif
 
 if v:version >= 704
-  function! airline#util#exec_funcrefs(list, break_early, ...)
+  function! airline#util#exec_funcrefs(list, ...)
     for Fn in a:list
-      if a:break_early
-        if Fn()
-          return 1
-        endif
-      else
-        call Fn()
+      let code = Fn(a:000)
+      if code != 0
+        return code
       endif
     endfor
+    return 0
   endfunction
 else
-  function! airline#util#exec_funcrefs(list, break_early, ...)
+  function! airline#util#exec_funcrefs(list, ...)
     " for 7.2; we cannot iterate the list, hence why we use range()
     " for 7.3-[97, 328]; we cannot reuse the variable, hence the {}
     for i in range(0, len(a:list) - 1)
       let Fn{i} = a:list[i]
-      if a:break_early
-        if Fn{i}()
-          return 1
-        endif
-      else
-        call Fn{i}()
+      let code = Fn{i}(a:000)
+      if code != 0
+        return code
       endif
     endfor
     return 0