@private
# File test-unit-3.5.3/lib/test/unit/assertions.rb, line 821 def extract_tag tag = nil if @@have_uncaught_throw_error return nil unless @error.is_a?(UncaughtThrowError) tag = @error.tag else pattern = UncaughtThrowPatterns[@error.class] return nil if pattern.nil? return nil unless pattern =~ @error.message tag = $1 end normalize_tag(tag) end