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rose-ash/lib/haskell/tests/program-io.sx
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haskell: real IO monad — putStrLn/print/putStr + hk-run-io (+10 tests, 575/575)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-06 13:10:42 +00:00

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;; program-io.sx — tests for real IO monad (putStrLn, print, putStr).
(hk-test
"putStrLn single line"
(hk-run-io "main = putStrLn \"hello\"")
(list "hello"))
(hk-test
"putStrLn two lines via do"
(hk-run-io "main = do { putStrLn \"a\"; putStrLn \"b\" }")
(list "a" "b"))
(hk-test "print Int" (hk-run-io "main = print 42") (list "42"))
(hk-test "print Bool True" (hk-run-io "main = print True") (list "True"))
(hk-test
"putStr collects string"
(hk-run-io "main = putStr \"hello\"")
(list "hello"))
(hk-test
"do with let then putStrLn"
(hk-run-io "main = do\n let s = \"world\"\n putStrLn s")
(list "world"))
(hk-test
"do sequence three lines"
(hk-run-io "main = do { putStrLn \"1\"; putStrLn \"2\"; putStrLn \"3\" }")
(list "1" "2" "3"))
(hk-test
"print computed value"
(hk-run-io "main = print (6 * 7)")
(list "42"))
(hk-test
"putStrLn returns IO unit"
(hk-deep-force (hk-run "main = putStrLn \"hi\""))
(list "IO" (list "Tuple")))
(hk-test
"hk-run-io resets between calls"
(begin
(hk-run-io "main = putStrLn \"first\"")
(hk-run-io "main = putStrLn \"second\""))
(list "second"))
{:fails hk-test-fails :pass hk-test-pass :fail hk-test-fail}