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/rubygems/resolver/molinillo/lib/molinillo/resolution.rb, line 306
def debug(depth = 0, &block)
resolver_ui.debug(depth, &block)
end