This method is only available on newer versions.
The first available version (v2_6_3) is shown here.
debug(depth = 0, &block)
private
Calls the {#resolver_ui}‘s {UI#debug} method @param [Integer] depth the depth of the {#states} stack
@param [Proc] block a block that yields a {#to_s}
@return [void]
# File lib/bundler/vendor/molinillo/lib/molinillo/resolution.rb, line 662
def debug(depth = 0, &block)
resolver_ui.debug(depth, &block)
end