erro sass ao compilar o zurb foundation com o sinalizador de variável global

O 'rake --trace assets: pré-compilarO comando 'fornece o seguinte erro:

rake aborted!
Sass::SyntaxError: Invalid CSS after "...ules: $modules ": expected "}", was "!global;"
  (in app/assets/stylesheets/foundation_and_overrides.scss:13)
foundation-rails-5.5.0.0/vendor/assets/stylesheets/foundation/_functions.scss:13
foundation-rails-5.5.0.0/vendor/assets/stylesheets/foundation/components/_global.scss:5
foundation-rails-5.5.0.0/vendor/assets/stylesheets/foundation/components/_grid.scss:5
foundation-rails-5.5.0.0/vendor/assets/stylesheets/foundation.scss:9
app/assets/stylesheets/foundation_and_overrides.scss:1327

O erro parece vir da linha 13 de 'Foundation-Rails-5.5.0.0 / fornecedor / assets / stylesheets / foundation / _functions.scss'

  8 // IMPORT ONCE
  9 // We use this to prevent styles from being loaded multiple times for compenents that rely o    n other components.
 10 $modules: () !default;
 11 @mixin exports($name) {
 12   // Import from global scope
 13   $modules: $modules !global;
 14   // Check if a module is already on the list
 15   $module_index: index($modules, $name);
 16   @if (($module_index == null) or ($module_index == false)) {
 17     $modules: append($modules, $name) !global;
 18     @content;
 19   }
 20 }

A sintaxe do SASS parece boa para mim e é compilada sem erros, desde que eu não tenha feito edições no arquivo gerado.'app / assets / stylesheets / foundation_and_overrides.scss.'Se eu fizer a menor alteração nesse arquivo, como a seguir, ocorrerá um erro de compilação.

--- a/app/assets/stylesheets/foundation_and_overrides.scss
+++ b/app/assets/stylesheets/foundation_and_overrides.scss
@@ -14,7 +14,7 @@ $base-font-size: 100% !default;
 // Since the typical default browser font-size is 16px, that makes the calculation for grid siz
 // If you want your base font-size to be a different size and not have it effect grid size too,
 // set the value of $em-base to $base-font-size ($em-base: $base-font-size;)
-$em-base: 16px !default;
+$em-base: 17px !default;

 // It strips the unit of measure and returns it
 @function strip-unit($num) {

O ambiente é Rails 4.0.8, Foundation-Rails 5.5.0.0

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