lix/tests/lang/eval-fail-foldlStrict-strict-op-application.nix

# Tests that the result of applying op is forced even if the value is never used
builtins.foldl'
  (_: f: f null)
  null
  [ (_: throw "Not the final value, but is still forced!") (_: 23) ]
primops: make nature of foldl' strictness clearer * Clarify the documentation of foldl': That the arguments are forced before application (?) of `op` is necessarily true. What is important to stress is that we force every application of `op`, even when the value turns out to be unused. * Move the example before the comment about strictness to make it less confusing: It is a general example and doesn't really showcase anything about foldl' strictness. * Add test cases which nail down aspects of foldl' strictness: * The initial accumulator value is not forced unconditionally. * Applications of op are forced. * The list elements are not forced unconditionally. 2022-10-15 23:32:55 +00:00			`# Tests that the result of applying op is forced even if the value is never used`
			`builtins.foldl'`
			`(_: f: f null)`
			`null`
			`[ (_: throw "Not the final value, but is still forced!") (_: 23) ]`