Ignore type error

Author: soutaro

lib/rbs/unit_test/with_aliases.rb

@@ -127,7 +127,9 @@ def with_range(start, stop, exclude_end = false)
 
             # `Range` requires `begin <=> end` to return non-nil, but doesn't actually
             # end up using the return value of it. This is to add that in when needed.
-            def lower.<=>(rhs) = :not_nil unless defined? lower.<=>
+            unless defined? lower.<=>
+              def lower.<=>(rhs) = :not_nil # steep:ignore MethodDefinitionInUndeclaredModule
+            end
 
             # If `lower <=> rhs` is defined but nil, then that means we're going to be constructing
             # an illegal range (eg `3..ToInt.new(4)`). So, we need to skip yielding an invalid range