Nested steps not being detected correctly

[enkessler]

None of the following steps will trigger the 'Nested step call' rule.

Given(/^a step that calls a step$/) do
  step "another step"
end

Given(/^another step$/) do
  step 'And yet another step'
end

Given(/^yet another step$/) do
  'foo'
end

The first step seems to get ignored because it does not use a step keyword. Coincidentally, Cucumber does not allow keywords to be used for single step calls (e.g. step "another step" will run while step "When another step" will cause an error).

Even when a keyword is present, the nested step seems to get ignored unless double quotes are used (i.e. step "And yet another step" will trigger the rule while step 'And yet another step' will not).