When working with a lot of feature files in cucumber you'll sooner or later run in to the problem of having 2 similar statements ie:

Then /^epic .*$/ do
end

Then /^epic fail$/ do
end

If you just run cucumber <feature file> with this definition it will fail with the following error: Ambiguous match of "epic fail". To solve this problem just add --guess on the command line (cucumber --guess <feature file>). What happens is that the cucumber runner does a bit of evaluating to decide what method to call, so far it has worked as expected. Files needed to test: * fail.feature:

Feature: Fail
	In order to test this
	I want a feature file that contains a test

	Scenario:
	Given a dummy
	When a win
	Then epic win

	Scenario:
	Given a dummy
	When an epic fail
	Then epic fail

* fail_step.rb

Given /^a dummy$/ do
end

When /^a win$/ do
end

When /^an epic fail$/ do
end

Then /^epic .*$/ do
end

Then /^epic fail$/ do
end