Using find/grep to find calls to "new 'Failure'" in the current (non- generated) rakudo code base I came up with the short list below. They all seem to represent legitimate cases of wanting to allocate a Failure object to return an undef type value like an index search that fails to find its search string.
Suggesting the possible closing of this ticket. src/builtins/any-str.pir:184: $P0 = new 'Failure' src/builtins/any-str.pir:246: $P0 = new 'Failure' src/builtins/control.pir:59: $P1 = new 'Failure' src/builtins/control.pir:379: exception = new 'Failure' src/builtins/io.pir:25: $P0 = new 'Failure' src/classes/Failure.pir:59: $P0 = new 'Failure' src/classes/Nil.pir:55: $P0 = new 'Failure'
