add TapUnavailableError

2 files changed, 2 insertions, 2 deletions

diff --git a/Library/Homebrew/cmd/readall.rb b/Library/Homebrew/cmd/readall.rb
index 9216f6377..260a1750d 100644
--- a/Library/Homebrew/cmd/readall.rb
+++ b/Library/Homebrew/cmd/readall.rb
@@ -35,7 +35,7 @@ module Homebrew
       formulae = Formula.full_names
     else
       tap = Tap.new(*tap_args)
-      raise "#{tap} does not exist!" unless tap.installed?
+      raise TapUnavailableError, tap.name unless tap.installed?
       formulae = tap.formula_files
     end
 
diff --git a/Library/Homebrew/cmd/untap.rb b/Library/Homebrew/cmd/untap.rb
index dd66cec1b..f1040bb05 100644
--- a/Library/Homebrew/cmd/untap.rb
+++ b/Library/Homebrew/cmd/untap.rb
@@ -7,7 +7,7 @@ module Homebrew
     ARGV.named.each do |tapname|
       tap = Tap.new(*tap_args(tapname))
 
-      raise "No such tap!" unless tap.installed?
+      raise TapUnavailableError, tap.name unless tap.installed?
       puts "Untapping #{tap}... (#{tap.path.abv})"
 
       formula_count = tap.formula_files.size