Allow specifying version in depends_on :python

Note, in the explict form:

    PythonInstalled.new('2.7') => :recommended

the tag :recommended is ignored (not a limitation
of PythonInstalled itself). One solution was to write

    PythonInstalled.new('2.7', [:recommended])

but that is not as beautiful as we like it.

Therefore, now it is possible to:

    depends_on :python => ['2.7', :recommended]

Only the first tag is attempted to be parsed as
a version specifyer "x" or "x.y" or "x.y.z"...

1 files changed, 3 insertions, 3 deletions

diff --git a/Library/Homebrew/dependency_collector.rb b/Library/Homebrew/dependency_collector.rb
index e11be462d..378e12cbb 100644
--- a/Library/Homebrew/dependency_collector.rb
+++ b/Library/Homebrew/dependency_collector.rb
@@ -70,7 +70,7 @@ class DependencyCollector
     elsif (tag = tags.first) && LANGUAGE_MODULES.include?(tag)
       # Next line only for legacy support of `depends_on 'module' => :python`
       # It should be replaced by `depends_on :python => 'module'`
-      return PythonInstalled.new("2", spec, *tags) if tag == :python
+      return PythonInstalled.new("2", spec) if tag == :python
       LanguageModuleDependency.new(tag, spec)
     else
       Dependency.new(spec, tags)
@@ -99,8 +99,8 @@ class DependencyCollector
     when :clt        then CLTDependency.new(tags)
     when :arch       then ArchRequirement.new(tags)
     when :hg         then MercurialDependency.new(tags)
-    when :python, :python2 then PythonInstalled.new("2", *tags)
-    when :python3    then PythonInstalled.new("3", *tags)
+    when :python, :python2 then PythonInstalled.new("2", tags)
+    when :python3    then PythonInstalled.new("3", tags)
     # Tiger's ld is too old to properly link some software
     when :ld64       then LD64Dependency.new if MacOS.version < :leopard
     else