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-rw-r--r--Library/Homebrew/keg.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index f724a068e..b13eb423e 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -29,7 +29,9 @@ class Keg
elsif formula.is_a? Pathname
# TODO
elsif formula.is_a? String
- kids=($cellar+formula).children
+ path=$cellar+formula
+ kids=path.children
+ raise "Empty installation: #{path}" if kids.length < 1
raise "Multiple versions installed" if kids.length > 1
@path=kids[0]
@name=formula