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-rw-r--r--Library/Homebrew/dependency_collector.rb5
1 files changed, 3 insertions, 2 deletions
diff --git a/Library/Homebrew/dependency_collector.rb b/Library/Homebrew/dependency_collector.rb
index 0c423cd09..22f690a8c 100644
--- a/Library/Homebrew/dependency_collector.rb
+++ b/Library/Homebrew/dependency_collector.rb
@@ -2,6 +2,7 @@ require 'dependency'
require 'dependencies'
require 'requirement'
require 'requirements'
+require 'set'
## A dependency is a formula that another formula needs to install.
## A requirement is something other than a formula that another formula
@@ -15,7 +16,7 @@ require 'requirements'
# specifications into the proper kinds of dependencies and requirements.
class DependencyCollector
# Define the languages that we can handle as external dependencies.
- LANGUAGE_MODULES = [
+ LANGUAGE_MODULES = Set[
:chicken, :jruby, :lua, :node, :ocaml, :perl, :python, :rbx, :ruby
].freeze
@@ -52,7 +53,7 @@ class DependencyCollector
when Symbol
parse_symbol_spec(spec, tag)
when String
- if LANGUAGE_MODULES.include? tag
+ if tag && LANGUAGE_MODULES.include?(tag)
LanguageModuleDependency.new(tag, spec)
else
Dependency.new(spec, tag)