lib/autoproj/variable_expansion.rb in autoproj-2.12.1 vs lib/autoproj/variable_expansion.rb in autoproj-2.13.0

@@ -78,10 +78,12 @@
             value
         end
     end
 
     # True if the given string contains expansions
-    def self.contains_expansion?(string); string =~ /\$/ end
+    def self.contains_expansion?(string)
+        string.respond_to?(:to_str) && string.to_str =~ /\$/
+    end
 
     def self.resolve_one_constant(name, value, result, definitions)
         result[name] ||= single_expansion(value, result) do |missing_name|
             result[missing_name] =
                 resolve_one_constant(missing_name, definitions[missing_name], result, definitions)